Operations and Programming Manual. ERC/EC-1000 Environmental Control. Supermarket Refrigeration

Transcription

1 Supermarket Refrigeration Operations and Programming Manual ERC/EC-1000 Environmental Control REFRIGERATION AND AIR CONDITIONING Literature No. RS.8B.J1.22 Code No. 084R9900 Release: Version 5.30/7.30 Date: November 9, 2000 Supersedes: Version 5.2/7.2, 12/1/98

2 NOTICE Energy Controls International (ECI), formerly an ECI Group company, was been acquired by Danfoss Inc. in September, In the text of this manual, "Danfoss/ECI" is used to represent the organization supporting this product Danfoss Inc. All rights reserved Subject to change without notice Printed in the U.S.A.

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4 Table of Contents Table of Contents... i List of Drawings (within Manual Text)... ix List of Tables... xi INTRODUCTION...1 ERC-1000 Specifications...2 ERC-1000 and EC-1000 Control Capability...3 Rack Control...3 Manual Overview...3 INSTALLATION INSTRUCTIONS MOUNTING AND POWER CONNECTION...4 Unpacking...4 Mounting Guidelines...4 I/O Connections...4 Serial Modules...4 Mounting...4 Connections...4 Relay Boards...4 Mounting...4 Connections...4 System Power Connection...5 Serial Communication Connections...6 PSI Board...6 Relay Boards and Module Serial Connections...6 Serial Communication LED Indicator...7 Serial Relay Boards and Module Power Connections...7 System Operation...7 Communication Connections...9 Modem Installation...9 Making Modem to ERC-1000 Cables...11 RS485 Repeater Board...12 ERC-1000 HARDWARE SYSTEM OVERVIEW...15 Display and Rubber Keypad...15 Power Supply...15 ERC-1000 Power Specifications...15 TF-5 Transformer...15 TF-6 Transformer...16 TF-15 Transformer...16 TF-16 Transformer...16 ERC-1000 Backup Battery...16 CPU Board...16 SERIAL HARDWARE AND HOOKUP...17 Introduction...17 Parallel Serial Interface Board (PSI)...17 i

5 Serial Modules Channel System Capability...17 INPUT/OUTPUT MODULES...18 Serial Relay Board...18 Serial Relay Board Features...18 Installation Considerations...18 Power Connections...19 Communication Connections...19 Relay Board Connection Considerations...19 Indicator Lights...19 Output Control Connections...19 Switches...20 SR8: 7500 Series...21 Serial Analog Output Module/4 Channel (SAO4)...22 Module Description...22 Serial Power Connections...22 Serial Output Communication Connections...22 Serial Digital Input Module/8 Channel (SDI8)...23 Module Description...23 Installation Considerations...23 Serial Power Connections...24 Serial Communication Connections...24 Digital Input Connections...24 High Voltage Interface Board (HVIB)...25 Serial Analog Input Module/8 Channel (SAI8)...26 Module Description...26 Installation Considerations...27 Module Temperature Range:TP Module Temperature Range:TP Module Pressure Range V Module Input Range...27 Serial Power Connections...27 Serial Communication Connections...28 Sensor/Input Connections V RH Sensor Connection V RH Sensor Power Requirement...29 Installation Requirements...29 Space Mount Sensor...29 Duct Mount Sensor...29 Outside Air Mount Sensor...30 Wiring...30 Serial 16 Channel Universal Input Board (SUI16)...32 Board Description (Dual 8 Channel Mode Operation)...32 Installation Considerations...32 Dual 8 Mode Operation...33 Board Address Setup...33 Board/ Channel Type Setup Channel Mode Jumper...34 ii

6 Channel Jumpers...34 Quick Reference Dual 8 Channel Rev. 5 Input Board Setup...35 Rev. 3 Universal 16 Channel Input Board...36 Serial Communication Wiring...36 ERC-1000 POWER MONITORING...37 Watt Transducers...37 Power System Environments...37 Three-Phase, Four-Wire Systems (House Power Monitoring)...37 Three-Phase, Three-Wire Systems (Rack Power Monitoring)...38 Current Transformers...38 Danfoss/ECI Watt Transducers...38 Watt Transducer Two Element Connections...39 Hookup Considerations...39 Watt Transducer Two Element Connections...40 Hookup Considerations...40 Watt Transducer Two and One Half Element Connections...41 Hookup Considerations...41 PROGRAMMING AND INTERROGATING THE ERC-1000: ERC-1000 SOFTWARE CONTROL OVERVIEW...42 Introduction...42 Menus and Screens...42 Installation Programming Sequence...42 ERC-1000 Data Access and Data Entry...43 ERC-1000 Abbreviations and Mnemonics...44 HVAC Unit Control Features...45 Introduction...45 ERC-1000 HVAC Control Parameters...45 HVAC Scheduling via the ERC HVAC Unit Configuration...45 Plenum Airflow Sensing...46 HVAC Unit Space Temperature Control...46 Space Temperature Control via HVAC Unit Configuration...46 Discharge Sensor Setpoint...46 Lockout Feature...46 HVAC Fan Control via the ERC Unoccupied Schedule...47 ERC-1000 Rack Control Features...48 Introduction...48 Rack Control/ Configuration...48 Rack Control/ Suction & Head Pressure...48 ERC-1000 Logic System Features...50 Introduction...50 ERC-1000 Logic Systems Control...50 ERC-1000 Anti-Sweat Heater Control...51 Introduction...51 Digital Anti-Sweat Heater Control...51 Analog Anti-Sweat Heater Control...51 iii

7 ERC-1000 Demand Systems Control...52 Introduction...52 ERC-1000 Satellite Systems Control...52 Introduction...52 Satellite Systems Control Modes...52 ERC-1000 Time-of-Day Output Control...53 Time-of-Day Output Configuration...53 Time-of-Day Output Control...53 Analog Light Level Control...53 Digital Light Level Control...53 Variable Ballast Control...54 The ERC-1000 Channel Assignment Capabilities...54 The Window/ Page Approach to User Interface...55 Schedule Programming for the ERC ERC-1000 Menus, Screens, and Related Data Fields...57 ERC-1000 Memory Check...57 ERC-1000 Title Screen...58 ERC-1000 Menu Screen Overview...59 ERC-1000 SOFTWARE CAPABILITIES...60 ERC-1000 Main Menu...60 HVAC Units Menu...60 HVAC Unit Status Screen...61 Introduction...61 HVAC Unit Status Screen Description...61 HVAC Units Setpoints Screen...64 Variable Speed Fan/ Sequence of Operation...69 Seasons-4 SmartCoil/ Sequence of Operation...69 ERC/EC-1000 Basic SmartCoil Control Strategy...69 HVAC Unit Names Screen...70 HVAC Unit Sensor Names Screen...70 HVAC Unit Configuration Screen...71 Rack Menu...74 Rack Control Menu...74 Rack Status Screen...75 Rack Setpoints Screen...77 Variable Speed Setpoints...80 Rack Overview Screen...84 Rack Name Screen...84 Rack Sensor Name Screen...84 Rack Configuration Screen...85 Aux Rack Control Menu...88 Rack Monitoring Points Setpoints Screen...88 Rack Monitor Names Screen...89 Rack Desuperheater Setpoints Screen...89 Aux Outputs Menu...90 Logic Statements...90 Logic Statements Status Screen...91 Logic Statements Setpoints Screen...92 iv

8 Logic Statements Clear Latch...96 Logic Statements Sensor Names...96 Logic Statements Names...96 Logic Statements Configuration...97 Anti-Sweat Heaters Menu...97 Digital Anti-Sweat Heaters Control...97 Anti-Sweat Heaters Status Screen...97 Anti-Sweat Heaters Setpoints Screen...98 Anti-Sweat Heaters Name Screen...98 Anti-Sweat Heaters Sensor Names Screen...98 Anti-Sweat Heaters Configuration Screen...98 Analog Anti-Sweat Heaters Control...99 Anti-Sweat Heaters Status Screen...99 Anti-Sweat Heaters Setpoints Screen...99 Anti-Sweat Heaters Name and Sensor Name Screens...99 Anti-Sweat Heaters Configuration Screen...99 Demand Systems Menu Demand Systems Status Screen Demand Systems Setpoints Screen Demand Systems Priority Names Demand System Names Demand Sensor Names Demand Systems Configuration Satellite Systems Menu Satellite Systems Status Screen Satellite Systems Setpoints Screen Satellite Systems Names Screen Satellite Systems Sensor Names Screen Satellite Systems Configuration Screen Time-of-Day Outputs Menu Time-of-Day Outputs Status Screen Time-of-Day Outputs Setpoints Screen Time-Of-Day Outputs Names Screen Time-of-Day Sensor Names Screen Time-of-Day Outputs Configuration Screen Log Menu Run Time Menu HVAC Log Menu HVAC Cycles Log Screen HVAC Runtimes Log Screen TOD Log Screen ASH Log Screen Satellite Log Menu Satellite Cycles Log Screen Satellite Runtimes Log Screen Rack Log Screen Note Log Alarm Log Screen Event Log Screen v

9 Power Log Menu Hourly Power Log Screen Daily Power Log Screen I/O Log Menu I/O Log-Analog & Digital Inputs & Outputs Override Menu TOD Overrides Override Log Digital Output Override Screen Digital Input Override Screen Sensor Input Offset Screen System Menu Date & Time Screen Daylight Savings Screen Alarm Dial Out Menu Alarm Phone Numbers Screen Alarm Setup Menu HVAC Units Alarm Setup Rack Alarm Setup Logic Statements Alarm Setup System Alarm Setup Dial Log Alarm Dial Out/ Miscellaneous I/O List Menu Analog Input List Screen Analog Output List Screen Digital Input List Screen Digital Output List Screen Access Codes Screen System Configuration Menu Miscellaneous Parameters Screen Analog Input Configuration Holidays Screen Master Clear Screen TROUBLESHOOTING Master Clear Procedures ERC-1000 Power Checkpoints Troubleshooting Procedure Serial Communications Problems Temperature Sensors Procedure Pressure Transducers Procedure Serial Relay Board Failure (8 Channel Digital Output) Channel Analog Input Module Serial Input Module Failure (8 Channel Analog Input/Digital Input) vi

10 APPENDIX A ERC-1000 CONVERSION TABLES APPENDIX B WARRANTY, REPLACEMENT PARTS, AND REPAIR PROCEDURE Warranty Information Trademark Information Repair Procedure Advance Shipment APPENDIX C FIELD WIRING REFERENCE GUIDE SERIAL MODULE CONFIGURATION CT SELECTION, CONNECTION AND SCALE FACTOR COMPUTATIONS.153 Serial Module Configuration CT Selection, Connection & Scale Factor Computations APPENDIX D INSTALLATION DIAGRAMS FIGURE 1: Typical Block Diagram Energy Management System FIGURE 2: Typical Serial I/O Connection Diagram FIGURE 3: Modem and PC Direct Store Communications FIGURE 4: Equipment Mounting and Dimensional Specifications FIGURE 5: Equipment Mounting and Power Hookup Diagram FIGURE 6: 12VAC CPU Power Hookup Diagram FIGURE 6A: CPU Power Hookup for TF-5 Transformer FIGURE 7: CPU Identification Diagram for Rev. 10 or Older FIGURE 8: CPU Identification Diagram for Rev. 11 CPU FIGURE 9: Phone Cable Assembly FIGURE 10: Serial Power and Communications Diagram FIGURE 11: Serial Relay Output Control Wiring and Snubber Installation FIGURE 12: Serial Module Interface Diagram FIGURE 13: Analog Interface Diagram FIGURE 14: 12VAC Power Supply with Dew Point Interface Wiring FIGURE 15: Serial Analog Input Pressure Equipment Wiring FIGURE 16: Serial Analog Input 0-10V Power Monitoring FIGURE 17: Light Level Sensor Wiring Diagram FIGURE 18: Serial Analog Input Pressure Equipment Wiring FIGURE 19: Serial Analog Input 0-10V Equipment Wiring FIGURE 20: 4-20mA Sensor Input FIGURE 21: Digital Input Interface Diagram FIGURE 22: Serial Digital Input Relay/ High Voltage Verification FIGURE 23: High Voltage to Dry Contact Interface for Proofing FIGURE 24: Serial Analog Output 0-10V Inverter Wiring FIGURE 25: 16 Channel Analog Input Configuration (Dual 8 Channel Mode) FIGURE 26: 16 Channel Analog Input Configuration (Dual 8 Channel Mode) FIGURE 27: Athena Solid State Controller Specifications FIGURE 28: NoSweat Hookup Diagram ERC/EC-1000 Control Software Version 5.3/7.3 Addendum Index vii

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12 List of Drawings (within Manual Text) Drawing 1:Sample Danfoss/ECI Control System...1 Drawing 2:CPU Board...5 Drawing 3:PSI Board...6 Drawing 4:TF-16 & TF-6 Transformer Wiring...8 Drawing 5:Communication Cable Orientation...11 Drawing 6:Repeater Board...12 Drawing 7:RS485 Repeater Board Configuration Options...13 Drawing 8:Serial Relay Board/ Part# CC/ Drawing 9:Serial Relay Board/ 7500 Series (Part# CC/ )...21 Drawing 10:Serial Analog Output Module Serial Output Wiring...22 Drawing 11:Serial Digital Input Module...23 Drawing 12:High Voltage Interface Board...25 Drawing 13:Serial Analog Input Module...26 Drawing 14:SAI8 to 0-10V RH Sensor Wiring...31 Drawing 15:SUI16 to RH Sensor Wiring...31 Drawing 16:Sixteen Channel Universal Input Board (Rev 5-8)...32 Drawing 17:Dip Switch Settings For Dual 8 Channel Rev. 5 Board Setup...33 Drawing 18:Jumper Configurations for Dual 8 Channel Rev. 5 Board Setup...34 Drawing 19:Sixteen Channel Rev. 3 Board...36 Drawing 20:kw Watt Transducer (Part #CC/ ) Two Element Connection...39 Drawing 21:kw Watt Transducer (Part #CC/ ) Two Element Connection...40 Drawing 22:kw Watt Transducer (Part #CC/ /403) 2½ Element Connection...41 Drawing 23:Serial Module Configuration ix

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14 List of Tables Table 1:ERC/EC-1000 Control Functions...3 Table 2:Manual Overview...3 Table 3:Load Chart (Page Power Requirements)...8 Table 4:Modem Command Line Settings for RC-2000 Version 4.40 and Lower and ERC/ EC-1000 Versions 5.20/ 7.20 and Lower...10 Table 5:Modem Command Line Settings for RC-2000 Version 4.41 and Higher and ERC/ EC-1000 Versions 5.21/ 7.21 and Higher...10 Table 6:U.S. Robotics 33.6 or 56K Sportster Modem Dip Switch Settings...10 Table 7:CPU Board Dip Switch ID Settings...16 Table 8:Eight Channel I/O System Setup Capability...17 Table 9:Typical Switch Position Versus Load State...20 Table 10:Digital Input Wiring...24 Table 11:Binary Values for Dip Switches Used in Dual 8 Channel Mode...33 Table 12:Communication Wire Size and Length...36 Table 13:Danfoss/ECI Watt Transducers Model Number Change Notice...38 Table 14:ERC-1000 Screen Mnemonics...44 Table 15:SmartCoil Bypass Damper Positions...69 Table 16:Compressor Unloader Assignment Example...79 Table 17:Danfoss/ECI Watt Transducer Power Rating Via Model Number...81 Table 18:Pressure to Voltage Conversion: SA-100D & SA-100A Table 19:Pressure to Voltage Conversion: SA-500D & SA-500A Table 20:Temperature to Voltage Conversion: TP-1 (C, L, H) Table 21:Dew Point to Voltage Conversion: DPS-1 at DPI Board, DR (+) to DW (-) Table 22:Dew Point to Voltage Conversion: DPS-1 at DPI Board, DP (+) to W (-) Table 23:Replacement Parts List Table 24:Field Wiring Reference Guide Table 25:Serial Module Configuration Table 26:CT, Connection, and Scale Factor Values xi

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16 INTRODUCTION The ERC-1000 and the EC-1000 combine the latest hardware and software available for energy control. They are microprocessor-based systems, combining state-of-the-art hardware and software to provide advanced control strategies and I/O flexibility. The ERC-1000 and the EC-1000 control HVAC (heating, ventilation, and air-conditioning), lighting, anti-sweat heaters, and other miscellaneous loads. Additionally, when networked with Danfoss/ECI Refrigeration Controls, the Danfoss/ECI system controls refrigeration. By combining environmental and refrigeration control, Danfoss/ECI controllers work together as an integrated system, reducing energy and maintenance costs, and safeguarding products and equipment. Drawing 1 below illustrates a typical Danfoss/ECI energy control system. IMPORTANT This manual encompasses both the ERC-1000 and the EC They mirror each other in functionality EXCEPT for RACK CONTROL. The EC-1000 DOES NOT SUPPORT RACK CONTROL! Office Modem Field Modem Remote PC Modem Adapter Telephone Service 6 Conductor Phone Cable Rack A RC-2000 DCU Communication Belden Wire I/O Communication Alarms Smart Alarm Data Communication Belden Wire Rack B DCU Communication HVAC and TOD Data Communication- 6 Conductor Phone Cable RC-2000 Data Communication- 6 Conductor Phone Cable I/O Communication ERC-1000 I/O Communication Belden Wire Refrigeration Control HVAC Control Drawing 1: Sample Danfoss/ECI Control System 1

17 ERC-1000 Specifications Power Requirements... 12VAC 2A DIMENSIONS ERC-1000 Environmental Control H x 9.63 W x 2.38 D ERC-1000 Environmental Control (with Dew Point Control and Power Supply) H x W x 5.00 D AMBIENT LIMITS Operating Temperature...32 to 100 F Humidity... 0 to 95% RH, noncondensing WIRING Serial Loop Communication Wiring for Serial Modules... 2 wire, 18 awg, unshielded, twisted pair; Belden 1 #8461 or equivalent Maximum Length: 2000 ft. Power Wiring for Serial Modules... 2 wire, 18 awg, unshielded, twisted pair; Belden #8461 or equivalent Max. Length (Module): 100 ft. Max. Length (Relay Board): 50 ft. RC-2000 to RC-1000, ERC-1000, or Modem... 6 conductor flat telephone cable; G-C Thorsen or equivalent Maximum Length: 100 ft. Sensor Wiring: Temperature, Thermistor, kw, Digital Inputs, and Analog Outputs... 2 wire, 18 awg, shielded, twisted pair; Belden #8760 or equivalent Maximum Length: 500 ft. Dew Point, Refrigerant Leak Sensor Wiring... 4 wire, 18 awg, shielded wire, Belden #9418 or equivalent Maximum Length: 500 ft. Relative Humidity Sensor Wiring... 3 wire, 18 awg, shielded wire, Belden #8770 or equivalent Maximum Length: 500 ft. MEMORY BACKUP Battery Backup... 3VDC Lithium 1. Belden is a U.S. registered trademark of Belden Inc. 2

18 ERC-1000 and EC-1000 Control Capability The Danfoss/ECI ERC-1000 and EC-1000 control an array of environmental functions in a facility. In addition to environmental control functions, an ERC-1000 can also control two rack systems. The control functions of these two systems are listed in Table 1 below. Table 1: ERC/EC-1000 Control Functions ERC-1000 EC HVAC Systems 8 HVAC Systems 2 Rack Systems *EC-1000 does not support rack control 32 Logic Statements 32 Logic Statements 2 ASH Systems 2 ASH Systems 2 Demand Systems 2 Demand Systems 8 Satellite Systems 16 Satellite Systems 16 TOD Systems 16 TOD Systems Rack Control The ONLY FUNCTIONAL DIFFERENCE between the ERC-1000 and the EC-1000 control products is in the area of rack control. The EC-1000 DOES NOT SUPPORT RACK CONTROL, whereas the ERC-1000 DOES SUPPORT RACK CONTROL (see Table 1 for a list of these product control functions). IMPORTANT This manual encompasses the ERC-1000 and the EC-1000 control products; however, the manual text refers to the ERC-1000 only. If you are using an EC-1000, any references to the ERC-1000 apply to it EXCEPT in the AREA of RACK CONTROL. If you are using an EC-1000, DISREGARD any references to RACK CONTROL functions. The EC-1000 DOES NOT SUPPORT RACK CONTROL! Manual Overview Table 2: Manual Overview Table 2 below overviews the information presented in this manual. FOR INFORMATION ABOUT THIS TOPIC: ERC-1000 Capabilities Installation Practices and Procedures Installation Practices and Procedures for the I/O Modules used with your ERC-1000 Setpoint, Sensor and Output Assignments Problem Diagnosis EC/ERC-1000 Conversion Tables Return Procedures/Replacement Part Ordering Field Wiring Guide And Serial Module Configuration Unit and Module Connection Diagrams Introduction TURN TO THIS SECTION: Installation Instructions I/O Connections Programming and Interrogation of the ERC Troubleshooting Appendix A Appendix B Appendix C Appendix D 3

19 INSTALLATION INSTRUCTIONS MOUNTING AND POWER CONNECTION Unpacking 1. Remove the ERC-1000 from its shipping container and inspect for physical damage. 2. Catalog the contents of the shipping container. You should receive: a. ERC-1000 Environmental Control Unit b. I/O modules (as per order) c. This instruction manual d. Relay Boards (as per order) e. Transformer and supply box assembly (as per order) f. Sensors, transducers, etc. (as per order) Note The ERC-1000 can be ordered in two ways: 1. as a complete HVAC/TOD panel or 2. as separate control units. (This REQUIRES field installation of all serial modules.) Mounting Guidelines Follow the instructions below when mounting your unit. 1. Inspect the cabinet where you will house the ERC Two mounting holes are inside it. You will use these holes to mount the cabinet. SUGGESTION For easy access to the unit (for service and operation), Danfoss/ECI recommends mounting it at eye-level. 2. Secure the cabinet with two ¼-inch mounting screws. I/O Connections Serial Modules Mounting ERC-1000 Serial Modules are generally mounted inside the Environmental/TOD Panel or the HVAC house. The mounting locations easily adapt to the individual application. They should have a local 12VAC power supply. Connections All wiring is connected to the modules via the terminal strip at the top left corner of the module. See the individual module sections in this manual for more information, and Figures 2 and 10 in Appendix D for connection diagrams. The Field Wiring Reference Guide in Appendix C lists wire specifications and lengths for the serial modules. Relay Boards Mounting ERC-1000 Relay Boards are generally mounted inside the Environmental Panel or the HVAC house. They should have a local 12VAC power supply. See Figure 10 in Appendix D. Connections Connect applied control circuits to relay outputs in accordance with the designed specifications. Make connections to the terminal blocks located on the relay board base assembly. Refer to the Field Wiring Reference Guide in Appendix C for wire specifications and lengths. NOTE Each relay provides both normally open (NO) and normally closed (NC) connections along with a common (C-#) that is fused at 3A. NOTE When installing OEM units refer to Figures 4 and 5 in Appendix D for mounting diagrams. 4

20 System Power Connection Follow the instructions below to power your ERC The shield plate (mounted with thumbscrews) attaches to the ERC-1000 mounting plate to protect the ERC-1000 CPU Board. The small ERC-1000 enclosure does not have a back plate. Notice the location of the power switch, fuses, and terminal block in the lower right-hand corner (see Figures 7 and 8 in Appendix D, and Drawing 2 below). 2. The ERC-1000 requires one external 12VAC, 30VA (minimum) supply line that is connected to the CPU Board's terminal block (see Figures 5, 6 and 6A in Appendix D, and Drawing 2 below). The 12VAC input is fused on the CPU board. A 12 VAC transformer (TF-5 or TF-6) is available from the factory. The TF-5 or TF-6 can be powered via 115VAC or 230VAC (208V). Either transformer provides one isolated secondary 12VAC output (see Figures 6 and 6A in Appendix D). NOTE It is recommended that the ERC-1000 have its own fused circuit. 3. The ERC-1000 power switch is located on the lower right corner of the CPU board. The switch slides up for the on position. (See Figures 5, 7, and 8 in Appendix D, and Drawing 2 below.) BACKLIT DISPLAY POWER A RED K BLK PIN #32 KEYPAD CONNECTOR 1 REGULAR DISPLAY BATTERY JP4 1 DISPLAY CONNECTORS DISPLAY CONTRAST 1 BACKLIT DISPLAY SERIAL OUT SERIAL IN DATA ADDRESS COMM PORT COMM PORT EPROM RAM OPTIONAL RAM JUMPER OVER TOP 2 POSTIONS FOR REGULAR AND BOTTOM 2 FOR BACKLIT DISPLAY I/O CONNECTOR JUMPER OVER 2 LEFT POSITIONS (PINS #2 AND 3) FOR 1 OR 2 MEG EPROM JP2 OFF ON 1 12VAC SUPPLY U22 CPU 8 UNIT ID SWITCH ISOLATION TRANSFORMER ON OFF 2 AMP FUSE POWER GND REF. (MOUNTING HARDWARE FOR U22) Drawing 2: CPU Board 5

21 Serial Communication Connections PSI Board The serial communication connections originate at the PSI Board, located directly above the CPU Board. The board receives its functional power from the CPU Board. The PSI Board has four termination connections at the top right hand corner (see Figure 5 in Appendix D and Drawing 3 below). The silk screen is marked Com and In for each pair of connections. NOTE Serial loop wiring IS polarity sensitive. OBSERVE the POLARITY of connection when installing the PSI Board. Failure to observe the polarity of serial loop wiring results in improper operation of your unit. Two pairs of connections for the serial loop allow the option of a return signal, and form a complete circuit loop. NOTE Danfoss/ECI recommends that a return signal be used to insure the function of the loop. Relay Boards and Module Serial Connections The relay board s serial connections are done through the terminal connectors marked SER IN and COMMON on the board s base (see Figures 2 and 10 in Appendix D). There are two pairs of serial connections on the relay board for ease of installation of the loop. The serial modules are terminated very similarly to the procedures listed above. The module serial connections are at the top left corner of the module and are marked SERIAL IN and COMMON. NOTE The wiring needs to be doubled in these connectors due to the design of the module. Precautions should be applied when installing the serial loop wiring to make precise terminations. IMPORTANT Observe the polarity of serial connection when installing the serial loop wiring. Incorrect polarity causes improper serial communication. IMPORTANT Termination of the loop must be at the connectors of all installed serial modules and relay boards. COM IN COM IN NOTE Connections are to serial modules or relay boards. Drawing 3: PSI Board 6

22 Serial Communication LED Indicator Each module or board has a red LED to designate the status of the serial loop communication. (On the Relay board and modules, it is located below the serial loop connection; on the PSI card it is located at the bottom left corner). A blinking light indicates satisfactory serial communication. Serial Relay Boards and Module Power Connections Serial modules and relay boards require a 12VAC supply for functional power. The modules and relay boards have termination connections for 12VAC inputs. These connections are located directly below the serial connections on the relay boards and next to the serial connections on the modules (see Figure 10 in Appendix D). The connections are marked 12VAC and are not polarity sensitive. A Danfoss/ECI TF-6 transformer is generally used to supply power. NOTE Power connection is not polarity sensitive. See Drawing 4 for TF-6 and TF-16 transformer wiring configuration examples. System Operation A couple of specifications can affect system operation: 1. Type and number of boards in conjunction with transformer type or types supplying 12VAC functional power. (See Table 3, the load chart, for more information.) 2. Total distance and type of cable supplying 12VAC functional power: For the relay board, the maximum distance from the transformer is 50 feet. For the modules, the maximum distance from the transformer is 100 feet. The current ratings are dependent on the type and class of transformer used in the application. Each relay board and module draws a certain amount of current to perform at a satisfactory level. NOTE Via Table 3 on the following page, calculate current draw based on the numbers of boards and modules used in the application. (The individual current draw of each Danfoss/ECI transformer also appears on this list.) The wiring specifications can be found in Appendix C. IMPORTANT Installation should follow the load and wiring specifications to ensure proper function of the system. If they are not followed, operation can be unpredictable. Power is supplied to the modules via two conductor 18 awg, unshielded, twisted pair wire (Belden #8461 or equiv.). See the Field Wiring Reference Guide in Appendix C for distances. See the load chart on the next page (Table 3), to calculate operational load requirements 7

23 Table 3: Load Chart (Page Power Requirements) TF-5 Transformer, 30VA, maximum current draw 2.5A TF-6 Transformer, 56VA, maximum current draw 4.5A TF-15 Transformer, 25VA, maximum current draw 2.0A TF-16 Transformer, 40VA, maximum current draw 3.3A SYSTEM COMPONENT Each Serial Relay Board Each Serial Input Module Temperature, 0-10V, Digital Each 16 Channel Input Module Each Serial Pressure Module Each Refrigerant Leak Transducer I/O Power MULTIPLIER.50 A.03A.10A.10A.23A Total less than or equal to 2.5A for TF-5 Transformer Total less than or equal to 4.5A for TF-6 Transformer Total less than or equal to 2.0A for TF-15 Transformer Total less than or equal to 3.3A for TF-16 Transformer Note: To determine SYSTEM AMP DRAW, perform the following calculations: 1. Determine the current draw for each of the system components by using the following equation: (# of each component) r (multiplier) = System Current Draw (for that component) 2. Next, add together all of the system component current draw results to determine the total system amp draw. 240/208 VAC Configuration 120 VAC Configuration Wirenut Together 6 WHT 5 BLK 240 VAC 50/60 Hz 2 WHT (208 Acceptable) 1 BLK BLU 7 12 BLU A to Serial Power 120 VAC 50/60 Hz WHT 6 BLK WHT BLK BLU 7 12 BLU A to Serial Power TF-16 Transformer TF-16 Transformer 240/208 VAC Configuration 120 VAC Configuration Wirenut Together 5 WHT 4 BLK 240 VAC 50/60 Hz 2 WHT (208 Acceptable) 1 BLK BLU 9 7 BLU A to Serial Power 120 VAC 50/60 Hz WHT 5 BLK WHT BLK BLU 9 7 BLU A to Serial Power TF-6 Transformer TF-6 Transformer Drawing 4: TF-16 & TF-6 Transformer Wiring 8

24 Communication Connections The ERC-1000 CPU Board employs two RJ-11 phone connectors for modem communication. The connectors are interchangeable. One connector is hooked to a modem and the other connector is used for communicating to other Danfoss/ECI control products (i.e., the RC-2000 or the Smart Alarm). To use these modem communication connectors, you need the following adapters: Modem Adapter Danfoss/ECI Part # CC/ (25-PIN) PC Direct Connect Adapter Danfoss/ECI Part # CC/ (25-PIN) Or Danfoss/ECI Part # CC/ (9-PIN) The RC/Modem Adapter connects a 25-pin/ RS232 port on the back of the modem to a six conductor flat phone cable that plugs directly into the CPU Board (see Figure 3 in Appendix D). The PC Direct Connect Adapter connects the RS232 com port on a computer directly to the com port on the ERC-1000, using a standard six conductor flat phone cable. This adapter can only be used when plugged directly into the ERC-1000 CPU (see Figure 3 in Appendix D). Modem Installation Danfoss/ECI offers a choice of modems for each installation. They are listed as follows: Practical Peripherals PMM14.4MT 11 External U.S. Robotics, 33.6 or 56K Sportster Minor software setup is required before initial use. Follow these steps to set up the modems in the field. 1. Attach the modem to Unit #1 via a sixconductor phone cable to the modem port on the CPU board. 2. Enter [the second level access code] (default is 9876). 3. From the Main Menu, press [SYSTEM], then [ALARM DIAL OUT], then [MISCELLANEOUS]. 4. Add the appropriate string to the modem command line. See Table 4 and Table 5, which follow. 5. Exit out to the Banner screen and allow the unit to save to flash. 6. Turn the modem off and on to reset it. 7. Turn Unit #1 off, wait 15 seconds, and turn it back on. Unit #1 initializes the modem. NOTE Through this process, the modem send and receive lights flash. This process takes about one minute. 8. Repeat steps 2-5 for each unit installed at your facility. 9

25 Table 4: Modem Command Line Settings for RC-2000 Version 4.40 and Lower and ERC/ EC-1000 Versions 5.20/ 7.20 and Lower BAUD RATE MODEM COMMAND LINE 2400/1200 Practical Peripherals 14.4 E0V0X1&C1&D2&Q6 2400/1200 Hayes Optima 24 (discontinued) E0V0X1&C1&D2&Q U.S. Robotics 33.6 or 56K Sportster E0V0X1&M4&A U.S. Robotics 33.6 or 56K Sportster E0V0X1&M0&N3&U U.S. Robotics 33.6 or 56K Sportster E0V0X1&M0&N2 Note: The 0 in the command string represents zero. Table 5: Modem Command Line Settings for RC-2000 Version 4.41 and Higher and ERC/ EC-1000 Versions 5.21/ 7.21 and Higher BAUD RATE MODEM COMMAND LINE 2400/1200 Practical Peripherals 14.4 &Q Practical Peripherals 14.4 &Q U.S. Robotics 33.6 or 56K Sportster &M4&N6&U2&A U.S. Robotics 33.6 or 56K Sportster &M0&N3&U2&A U.S. Robotics 33.6 or 56K Sportster &M0&N2&A0 Note: The 0 in the command string represents zero. Table 6: U.S. Robotics 33.6 or 56K Sportster Modem Dip Switch Settings SWITCH NUMBER SWITCH SETTING READING 1 UP DTR Normal 2 UP Numeric result codes 3 DOWN Display result codes 4 DOWN No echo offline commands 5 UP Auto answer on first ring 6 UP Carrier detect normal 7 DOWN Load factory default 8 DOWN Smart mode 10

26 Making Modem to ERC-1000 Cables To communicate between the ERC-1000 and a modem, use a standard six-conductor communication cable with a modular RJ-11 jack on both ends. The cable must be assembled with the jacks crimped the same way on both ends. With the tab facing toward you, install the cable with the white conductor on the right for both ends. See Drawing 5 below for details. NOTE Danfoss/ECI-manufactured cables apply the White on Right Rule. They are assembled with the white wire on the right side of the connector. If one end needs to be shortened, make sure the proper connector orientation is maintained. If the ends of the cable being tested can t physically be plugged into the same tester, then two testers are necessary to perform the test. To make custom cable lengths or repair a cable, you need a cable termination tool. This tool (Part # CC/CRIMP-1) and RJ-11 connectors (Part # CC/PCONN) are available from Danfoss/ECI. The drawing below shows the standard cable assembly that Danfoss/ECI uses. You may order a cable tester from Danfoss/ECI (Part # CC/ ). Six Conductor Communication Cable RJ-11 Jack (Tab Up) Cable Orientation BLUE YELLOW GREEN RED BLACK WHITE RJ-11 Jack (Tab Down) BLUE YELLOW GREEN RED BLACK WHITE Drawing 5: Communication Cable Orientation 11

27 RS485 Repeater Board The RS485 Repeater Board is used to increase the remote communication ability of your Danfoss/ ECI controller. If your ERC-1000 remote communication needs exceed the distances specified in the Field Wiring Reference Guide (found in Appendix C), use this board to increase your maximum distance. Refer to Drawing 6 and Drawing 7 that follow for more information. 12 VAC Connections 12 VAC 12 VAC P2 6 Conductor Modem Modem Connection RS485 Connections +RS485 -RS485 P1 6 Conductor Smart Alarm 6 Conductor Connection NOTE The 12VAC connections are not polarity sensitive. P2 is silk-screened to the right of the 12VAC connections on your board. The RS485 connections are polarity sensitive. Observe the polarity of connection when installing. P1 is silkscreened to the right of the RS485 connections on your board. Drawing 6: Repeater Board 12

28 Option #1 RS-485 Loop: AWG 18 Twisted Pair, 3500 ft. Max. 12 VAC RC-2000 Unit ID #1 485 Repeater RS232 Modem RS232 Smart Alarm Laptop Option #2 RS-485 Loop: AWG 18, Twisted Pair, 3500 ft. Max. 485 Repeater 12 VAC ERC-1000 RS232 RC-2000 Unit ID #1 RS232 RS232 RS232 Laptop Modem Smart Alarm ERC-1000 ERC-1000 RS232 Indicates optional connection NOTE: Do not exceed 1000 ft. with the RS232 cable. A laptop computer can be hooked up to the repeater via an adapter (Danfoss/ECI part # CC/ [25 pin] or CC/ [9 pin]). Drawing 7: RS485 Repeater Board Configuration Options 13

29 Option #3 RS-485 Loop: AWG 18, Twisted Pair, 3500 ft. Max. 485 Repeater 12 VAC 485 Repeater 12 VAC RS232 RS232 RS232 ERC-1000 Unit ID #1 Modem ERC-1000 ERC-1000 ERC-1000 Laptop Option #4 RS-485 Loop: AWG 18, Twisted Pair, 3500 ft. Max. 485 Repeater 12 VAC 485 Repeater 12 VAC RS232 RS232 RS232 ERC-1000 RC-2000 Unit ID #1 Modem Smart Alarm Laptop Indicates optional connection NOTE: Do not exceed 1000 ft. with the RS232 cable. A laptop computer can be hooked up to the repeater via an adapter (Danfoss/ECI part # CC/ [25 pin] or CC/ [9 pin]). (continued) RS485 Repeater Board Configuration Options 14

30 ERC-1000 HARDWARE SYSTEM OVERVIEW The ERC-1000 hardware system contains a power source, a CPU Base Unit, and up to 32 serial I/O (input/output) modules. The CPU Base Unit is assembled from a sturdy enclosure, housing these components: CPU (Central Processing Unit) Board Four-line, forty-character wide (4 x 40) LCD (liquid crystal display) Keypad Additionally, a PSI (Parallel to Serial Interface) for I/O communication is located behind the display above the CPU Board. The ERC-1000 Controller also includes these installation and maintenance features: Removable keyed latch door Pilot holes for conduit fittings Display and Rubber Keypad The display and rubber keypad are mounted on the ERC-1000 door; they provide a graphic means of firmware communication. The four-line by forty-character backlit liquid crystal display is powered by the CPU Board power supply. Each screen provides clear menu choices that you can respond to via the number and arrow keys on the keypad. For more detail on the menu screens and programming capabilities of the ERC-1000 Controller, refer to the Programming and Interrogating the ERC-1000 section of this manual. Power Supply CAUTION USE a DEDICATED POWER SOURCE to power the ERC-1000 whenever possible. FAILURE TO DO SO may cause EQUIPMENT DAMAGE. The ERC-1000 CPU Board and Serial I/O Modules each require a separate 12VAC power source. IMPORTANT DO NOT USE the same transformer to power both the CPU and the Serial I/O Modules. The CPU and the group of Serial I/O Modules each require a separate 12VAC power source! ERC-1000 Power Specifications AC Input: CPU Board... internally 2A Danfoss/ECI offers four power sources: 1. Model TF-5 (30VA) transformer 2. Model TF-6 (56VA) transformer 3. Model TF-15 (25VA) transformer 4. Model TF-16 (40VA) transformer The transformers are pre-wired with colorcoded wire terminations and available with or without an enclosure. TF-5 Transformer This model transformer accepts a dual voltage primary and produces an isolated 12VAC 30VA secondary output. The TF-5 can be powered by 120VAC or 240VAC (208V) sources. (See Figures 6 and 6A in Appendix D.) 15

31 TF-6 Transformer The TF-6 accepts a dual voltage primary and produces one isolated 12VAC 56VA secondary output. The TF-6 can be powered by 120VAC or 240VAC (208V) sources (see Figure 10 in Appendix D). See Table 3, the load chart, for a list of output capabilities. TF-15 Transformer The TF-15 accepts a dual voltage primary and produces one isolated 12VAC 25VA secondary output. The TF-15 can be powered by 120VAC or 240VAC (208V) sources (see Figure 10 in Appendix D). See Table 3, the load chart, for a list of output capabilities. TF-16 Transformer The TF-16 accepts a dual voltage primary and produces one isolated 12VAC 40VA secondary output. The TF-16 can be powered by 120VAC or 240VAC (208V) sources (see Figure 10 in Appendix D). See Table 3, the load chart, for a list of output capabilities. ERC-1000 Backup Battery Each ERC-1000 is supplied with one 3VDC Lithium battery that is UL approved for installation in electronic equipment. The battery is located near the top-middle of the CPU Board. It is mounted in a holding clip. IMPORTANT If the ERC-1000 loses power, the backup battery is sufficient to retain all data (setpoints, etc.) for a minimum of one year. Danfoss/ECI recommends that a qualified technician REPLACE the battery. Consult the factory for battery replacement. CPU Board A list of CPU Board features appears below: V40 Microprocessor with addressing capability of...2 megabyte (MB) RAM kilobytes (KB) ROM kilobytes (KB) In addition, the CPU contains a watchdog timer circuit for processor lockup recovery. The system I/O interface is achieved with an optically coupled, twenty-pin data bus that isolates the processor circuitry from electrical noise present in harsh environments. The ERC-1000 power and communications connections are made on this board. The 8- position dip switch has several purposes, which include addressing the board and setting the communication speed. Table 7 below shows the settings for switches 1 through 5. (See Figures 7 and 8 in Appendix D for more information about CPU Board dip switch settings and positions.) Table 7: CPU Board Dip Switch ID Settings UNIT # Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit 8 SWITCH POSITION Switch 1, closed Switch 2, closed Switch 3, closed Switch 4, closed Switch 5, closed Switch 1+ 5, closed Switch 2 + 5, closed Switch 3 + 5, closed NOTE Dip switch 6 is used to set the remote baud rate setting: For 1200 baud, switch 6 should be OPEN. For 2400 baud, switch 6 should be CLOSED. Dip switch 7 is also used to set the remote baud rate setting in the ERC-1000 Version 5.10 or higher and in the EC-1000 Version 7.10 or higher. For 9600 baud, switch 7 should be CLOSED. The current version of the CPU does not support dip switch 8. It should remain open. 16

32 SERIAL HARDWARE AND HOOKUP Introduction Serial describes the data transfer method from I/O devices to the ERC The ERC-1000 supports serial communication via serial communication I/O modules. Serial communication replaces parallel bus communication formerly supported with the 1000 series controls. NOTE The ERC-1000 supports serial communication through a Parallel to Serial Interface Board (PSI). Parallel Serial Interface Board (PSI) The PSI Board converts the parallel (8 bit lines) information to a serial (bit stream) format. This board can be used with the parallel bus to accommodate serial and parallel input modules. It is installed in the CPU base unit directly above the CPU. The serial communication terminates via connectors at the top right corner of the board. (See Figure 5 in Appendix D.) Serial Modules Danfoss/ECI offers the following types of Input/Output (I/O) modules: 1. Digital Output 8 Channel 2. Analog Output 4 Channel 3. Digital Input 8 Channel 4. Analog Input 8 Channel 5. Universal Input 16 Channel All modules are packaged individually and have their own part number. In combination, they comprise your system. The ERC-1000 can be configured with any combination of serial modules, if no more than eight modules of one family are installed. They can be set up for eight channel I/O addressing. 8 Channel System Capability The ERC-1000 supports a group of eight boards per I/O type. (See Table 8 below.) The system as set up below supports a maximum of: 64 digital inputs, 64 analog inputs, 32 analog outputs, and a maximum of 64 digital outputs. Table 8: Eight Channel I/O System Setup Capability Analog/Output (SAO4) (4 Channel) Digital/Output (SR8) (8 Channel) Analog/Input (SAI8) (8 Channel) Digital/Input (SDI8) (8 Channel) Board Address: Board Address: Board Address: Board Address: NOTE: Serial Analog Output Module (SAO4): 4 Outputs, each with a single board address 1-8. Serial Relay Board/Digital Output (SR8): 8 Outputs, each with a single board address 1-8. Serial Analog Input Module (SAI8): 8 Inputs, each with a single board address 1-8. Serial Digital Input Module (SDI8): 8 Inputs, each with a single board address

33 INPUT/OUTPUT MODULES Serial Relay Board The Serial Relay Board (SR8) contains all of the terminal strips for digital/output control circuit connections. The relay board snaps into a piece of snap track. Loads are hooked up to the removable terminal strips on the relay board. (See Figures 10, 11, and 12 in Appendix D for detailed connection diagrams). Serial Relay Board Features For a detailed diagram of the SR8, refer to Drawing 8 below. Serial Relay Board features include: Red LEDs for power/communication RS232 connection for serial communication RS485 connection for serial communication (for future use) Eight position ID dip switch (values are numeric) Plastic cover plate to shroud the board s low voltage side and provide a place to apply the relay labels Dimensions of 10 Long x Wide x 1.85 High Installation Considerations Relays...fused at 3A, 250VAC/ COM terminal Relay rating...10a/250vac 1/3 hp/240vac Relay Channels Relay Control Labels Switches Dip Switch Power Connection Terminals (12VAC) RS485 Serial Connection Terminals Output Connection Terminals ENRGZ Relay LEDs Override LEDs RS232 Serial Connection Terminals Fastening Screws for Terminal Strips Drawing 8: Serial Relay Board/ Part# CC/

34 Power Connections This board (SR8 Relay Board) requires a 12VAC power supply and draws approximately 0.5A. Power connection IS NOT polarity sensitive and is done through a 12VAC connector at the top right corner of the board. This connection is marked on the silk-screen labeling on the board. Refer to Drawing 8 on the previous page for a diagram of the relay board. NOTE A power LED is located directly below the 12VAC connector. It is lit when 12VAC power is applied to the board. Communication Connections The serial communication IS polarity sensitive and is connected through the RS232 connection at the bottom right corner of the board. The silk-screen label on the board designates the polarity of the connections. The signal should connect at the In, and the common should connect at the common. Once the connection is complete, and the board is assigned one time to the program, the two LEDs below the power LED light to show satisfactory communications. CAUTION Observe the POLARITY of the SERIAL CONNECTIONS when installing. Incorrect polarity of serial connections causes an inaccurate reading or no reading at all. DO NOT USE the RS485 connection located directly above the Serial RS232 connection on the right side of the board. The connection is for future use. Relay Board Connection Considerations Power Connections Board Power Supply... 12VAC Board Power Wiring... Belden #8461 or Equivalent Polarity Sensitive... no Board Power Draw A Maximum distance feet Serial Communication Connections Board Serial Wiring to the ERC-1000:... via two wire, 18 awg,... unshielded, twisted pair... Belden #8461 or... equivalent Polarity Sensitive... yes Max. Distance feet Indicator Lights Three LEDs are located on the right center portion of the board: Power On Receive Transmit The top LED, labeled Power On, indicates satisfactory application of the 12VAC when it stays lit. The middle LED, labeled Receive, indicates satisfactory serial communications when it blinks quickly, almost appearing continuously lit. The bottom LED, labeled Transmit, also indicates satisfactory serial communications when it blinks at a steady rate. Output Control Connections Removable terminals exist for common (C), normally open (NO), and normally closed (NC) relay operations. All relays are fused at three amps, 250VAC and 1/3 hp at 240VAC. Refer to Drawing 8 on the previous page for a detailed location of the output terminal connections. 19

35 Switches Each relay has a three-position control switch and is marked as follows: ENRGZ (Energized) AUTO (Automatic) DNRGZ (De-energized) When the ENRGZ or DNRGZ switch is on, the operational status of the relay bypasses the computer. When the system runs in AUTO, the ERC-1000 runs the system. If you desire manual control of your system, place the control switch in override. If you desire computer control of your system, place the control switch to AUTO. Table 9: Typical Switch Position Versus Load State LOAD TYPE SWITCH POSITION ENRGZ Fan OFF ON DNRGZ NOTE The positions ENRGZ and DNRGZ override the ERC-1000 s control of the relay s state. If the red LED is lit, the ERC-1000 or the ENRGZ override energizes the relay. If the red LED is not lit, the ERC-1000 or DNRGZ switch de-energizes the relay. If the blinking yellow LED is lit, the control switch is moved from the AUTO position to either of the two override positions. In the event of a system failure, the relays fail in the DNRGZ position. SAFEGUARD Label all relays with their correct function this assists any future troubleshooting or maintenance procedures. AC, HR, AH ON OFF Alarm NO ALARM IN ALARM Compressor OFF ON Condenser Fans OFF ON 20

36 SR8: 7500 Series Refer to the drawing below for an example of the 7500 series SR8. Most of the functionality is similar to the current SR8. Differences are found in the locations of connections. Look at your board to determine its revision level, and compare it to the applicable drawing. Reference the locations of connections in order to service this prior revision. Relay Channels Relay Labels ENRGZ Load LEDs Control Switches Override LEDs Serial Comm. Terminals Dip Switch Power Connectionn Terminals (12VAC) Output Connection Terminals Fastening Screws for Terminal Strip Drawing 9: Serial Relay Board/ 7500 Series (Part# CC/ ) 21

37 Serial Analog Output Module/4 Channel (SAO4) Module Description Refer to Drawing 10 below and Figure 24 in Appendix D for a diagram of a Serial Analog Output Module (SAO4). Serial Analog Output Module features include: Black case housing Dimensions of: 3.5 Wide x 5.2 Long x 2 High Two mounting holes Eight position dip switch (values are numeric) Red LED for communication Also, each SAO4 provides four channels for sending 0-10VDC control signals to other control systems (i.e., DC inverters for variable speed compressors or condensers). Serial Power Connections The 12VAC serial power connects in through the 12VAC In connections and out through the 12VAC Out connections at the top left corner of the module. (Serial power connections ARE NOT polarity sensitive.) CAUTION The 12VAC power source cannot exceed 50 feet in distance from the modules. Serial Output Communication Connections The serial communication connects in to Ser In/COM and out through Ser Out/COM on the module, and IS polarity sensitive. This board supports four channels and common connections for the 0-10 volt output for analog control signals. See Figure 24 Serial Analog Output 0-10V Inverter Wiring in Appendix D for a diagram of this connection type. CAUTION Observe the POLARITY of SERIAL COMMUNICATION connection when installing. Incorrect polarity causes an inaccurate reading or no reading at all. 12VAC TO OTHER SERIAL MODULES Mounting Hole TWISTED WIRE PAIRS Communication LED CONTROL INPUT 0-10VDC (TYP) L L N TWISTED WIRE PAIRS Dip Switch ANALOG OUTPUT INVERTER SERIAL COMMUNICATIONS LOOP TO OTHER SERIAL MODULES NOTE: Connect the shielded cable at the inverter end ONLY. L L N FAN OR COMPRESSOR (VARIABLE SPEED) 2 CONDUCTOR TWISTED SHIELDED BELDEN 8760 Drawing 10: Serial Analog Output Module Serial Output Wiring 22