OPERATIONS AND MAINTENANCE MANUAL

Transcription

1 ETRON OPERATIONS AND MAINTENANCE MANUAL SNAPPAC D.C. MOTOR CONTROL

2 Notice: All information, illustrations and specifications contained in this manual are based the latest product information available at the time of publication. The right is reserved to make changes at any time without notice. Copyright 1986, Extron Company. Table of Contents Section Page 1.0Introduction Technical Data Installation Operation and Adjustment Procedure Section A: Basic Armature Feedback Introduction 3.1.2Description and Operation 3.1.3Adjustment Procedures 3.1.4Applicable Documents 3.2 Section B: Pulse Feedback Introduction 3.2.2Description of Operation 3.2.3Adjustment Procedure 3.2.4Applicable Documents 3.3 Section C: Tachometer Feedback Introduction 3.3.2Description of Operation 3.3.3Adjustment Procedure 3.3.4Applicable Documents 3.4 Section D: Instrument Follower Isolation Option Introduction 3.4.2Description of Operation 3.4.3Adjustment Procedure 3.4.4Applicable Documents 3.5 Section E: Start/Stop Option Introduction 3.5.2Description of Operation 3.5.3Adjustment Procedure 3.5.4Applicable Documents

3 Continued 3.6 Section F: Reversing Introduction 3.6.2Description of Operation 3.6.3Adjustment Procedure 3.6.4Applicable Documents 3.7 Section G: Run Control Introduction Description of Operation 3.7.3Adjustment Procedure 3.7.4Applicable Documents 4.0 Trouble Shooting Procedure Replacement Parts Common Parts Special Parts Standard Option Cards Pulse Feedback Tachometer Feedback Card Instrument Follower/Isolation Card Start/Stop with Dynamic Braking Reversing with Dynamic Braking Run Control Card 6.0Schematics and Connection Diagrams Schematic Diagram: 1/4-2 Hp Schematic Diagram: 3-5 Hp Schematic Diagram: Start/Stop Control 1/4-2 Hp Schematic Diagram: Start/Stop Control 3-5 Hp Schematic Diagram: Run Control 1/4-2 Hp Schematic Diagram: Run Control 3-5 Hp Schematic Diagram: Reversing Control 1/4-2 Hp Schematic Diagram: Reversing Control 3-5 Hp Schematic Diagram: Pulse Feedback Card Schematic Diagram: Tach Feedback Card Schematic Diagram: Instrument Follower Cross Reference (Model Number vs Features & Options) Connection 8.1Connection 9.0 Diagrams: 1/4-2 Hp Diagrams: 3-5 Hp Factory Service and Warranty Information

4 1.0 INTRODUCTION This manual covers the single phase Snap-Pac series controls 1/4 HP through 5 HP These controls are complete motor controls, which provide speed control for D C shunt-wound motors, as well as permanent magnet motors, from zero to full motor speed Models 112, 113, and 114 cover Vi through 2 HP, and Models 115,116, and 117 cover 3 and 5 HP The standard SnapPac motor control voltage ratings are listed in Table TECHNICAL DATA Speed Range (controller) Minimum Speed Adjust 20 1 maximum, Armature feedback 30 1 maximum, Pulse feedback 30 1 maximum, Tack feedback 0-30% base speed Maximum Speed Adjust % of base speed Full Torque Speed Range (controller and motor) Continuous duty (Open and TEFC motors) 60% to 100% base speed Continuous duty (TENV) 5-100% base speed Speed Regulation (95% load change) Transient Protection MOV and RC suppressor Input Voltage 115 VAC ± 10% 230 VAC ± 10% ± 2% base speed, Armature feedback ±1% base speed, Tachometer feedback ± Vi% base speed, Pulse feedback Frequency 50/60 Ambient Temperature Range 0 C to 50 C Load Inertia Current Limit Not more than motor inertia when referred to motor shaft % of f u l l load IR Compensation Control Voltage to Operator's Station 24VDC Adjustable to match motor Arm Volt 90 VDC Armature Current 5 amp Field* Voltage 100 VDC Field Current 2 amp Max AC Current 8 amp /4-1 HP VAC 90 VDC 10 amp 100 VDC 2 amp 16 amp /2-1 HP 230 VAC 180 VDC 5 amp 200 VDC 2 amp 8 amp /2-2 HP 230 VAC 180 VDC 10 amp 200VDC 2 amp 1 6 amp HP 230 VAC 180 VDC 25 amp 200VDC 2 amp 29 amp Model V A -V 2 HP 115 VAC Fig. 1 Control Specification Chart

5 2.0 INSTALLATION Before installing the motor, read the motor nameplate. Check the HP rating, armature voltage, and field voltage data. Make sure that these ratings agree with the motor control identification. If the nameplate rating is different from control rating, consult the factory before installing the motor. The drive motor may be connected to the load through a gear reducer, belt or by direct coupling. When a motor is coupled through a gear reducer, make certain the C flanges are mated properly. Connect the gear reducer according to the manufacturer's instructions. If the motor is coupled to the load by belting, it is important that the sheaves be in line. Check belt tightness. A belt that is too loose will result in excessive slippage. Direct coupling is best accomplished by using a flexible coupling. A proper coupling will extend the life of the bearings in the motor. Note: A properly connected, direct coupled load does not exert force on the motor shaft in any direction. Refer to the connection diagrams or schematics furnished with the motor before connecting the motor to the control. P1 and P2 leads are usually for built-in motor thermostats. S1 and S2 leads are for a stabilized shunt winding. It is best to leave this disconnected. Motors with additional field leads marked F3 and F4 are for special field connections. Check motor manufacturer supplied connection diagrams before operation. The standard direction of the motor rotation is counter clockwise (CCW) looking at the end opposite the drive shaft. Extronsupplied motors, connected as shown in the connection diagrams, will rotate in the CCW direction. The Snap-Pac should be mounted in a vertical position, allowing at least 4" clearance on all sides. Any other mounting position should be avoided since the natural flow of air will be impeded with consequent overheating and possible premature failure or reduced life of control components. Local codes should be followed when installing the Snap-Pac. The circuit breaker that is provided is intended to protect the control only. All signal lines should be isolated from all power lines to avoid noise pick-up. Refer to the appropriate connection diagram provided with the control when making all connections to the motor control. Note: the speed potentiometer is floating at armature potential on armature feedback drives. Caution should be used to avoid grounding any of the connections on the armature feedback drives. 1.Recheck all control and motor connections before applying power to the control. Make sure all connections are correct and tightly secured. 2.Set the speed potentiometer to zero. 3.Turn on the A.C. power. 4.On Start/stop or reversing models, depress the proper run button. 5.Slowly increase the speed potentiometer until the motor shaft turns. If the motor rotation is opposite to that desired, stop the motor and turn off the A.C. power and interchange the two armature leads. 6.Restart the control and adjust the motor control as indicated in the following sections. 2.

6 3.0 OPERATION AND ADJUSTMENT PROCEDURE The following sections outline standard operation and adjustment procedure for standard Snap-Pac motor controllers. To determine which section applies, find the controller model number on the drive nameplate. Refer to the following table. If motor controller model doesn't correspond to the below key, it is a custom control. Literature that applies to custom controls will be enclosed with the custom control at the time of shipment. * It is recommended that all drives be fused with optional semi-conductor fusing for optimum protection. Semi Conductor Fuse Table Hp VAC Qty Fuse P/N 1/ FWA Qty. 1 1/ FW FW Fuse Holder P/N Applicable Section 11-0 A Armature feedback A Armature feedback E Start/Stop with DB 2 B Pulse feedback 3 C Tachometer feedback 4 B Pulse feedback E Start/Stop with DB C Tach feedback E Start/Stop with DB 5 A Armature feedback F Reversing 6 A Armature feedback D Instrument follower A Armature feedback 8 D Instrument follower E Start/Stop with DB A B C D A Armature feedback G Run control B Pulse feedback G Run control C Tach feedback G Run control D Instrument follower G Run control

7 SECTION A: BASIC ARMATURE FEEDBACK Introduction The basic Snap-Pac D.C. motor controller is designed to control the speed of a D.C. motor by varying the applied armature voltage. The controller consists of two printed circuit cards mounted on a heat sink with the power conversion module. The printed circuit boards are held in place by a shroud that may contain an input power circuit breaker and speed setting potentiometer Description and Operation The power conversion module contains a full semi-conductor bridge with diodes in two legs and SCR's in the other two. A.C. voltage is converted to D.C. by the bridge and the D.C. voltage level is controlled by controlling the phase angle firing of the SCR's. A commutating (free wheeling) diode is also included in the power module to provide a path for current during phase back operation as well as helping minimize D.C. output ripple. The SCR firing circuit controls the phase angle firing of the SCR's in response to signals from the regulator circuitry. The regulator circuit compares a speed command (from the speed setting potentiometer) with the actual motor voltage level. The resulting error signal is amplified and used to control the firing circuit. A signal proportional to armature current is fed into the regulator to compensate for speed change due to load. A signal proportional to armature current is also used in the current limit circuit. The current feedback signal is compared against a current set point signal. If the current rises above the current limit set point, the SCR's are phased back to limit the current to the set point Adjustment Procedures The control has been factory-tested and adjusted, and should only require minor adjustment to meet specific requirements. The following adjustments can be made with the motor at operating temperature, usually achieved within 30 minutes from a cold start. 1.Maximum speed With the speed adjust pot set at 100, adjust the max. speed pot for a motor speed of 1750 RPM; 2.Minimum speed With the speed adjust pot set at 0, adjust the min. speed pot until the motor just stops. Note: It may be necessary to readjust the max. speed pot. 3.Current Mm it The current limit pot controls the current in a linear fashion from 1 0% to 1 50%, and is normally set for 1 20% of the motor armature rating. If it is desired to control the current limit in order to protect the equipment, applythe maximum load to the motor that will normally be encountered and turn the current limit pot down until the motor speed begins to drop off, then increase the current limit 1/8 turn. 4.I.R. Compensation This adjustment corrects for speed loss when the motor is loaded. With the speed adjust pot at 1 5, measure the no-load speed of the motor, then load the motor and adjust the I.R. compensation until the no-load speed is reached. Note: Too much I.R. compensation can cause instability in the motor speed Applicable Documents PD Schematic diagram

8 SECTION B: PULSE FEEDBACK Introduction Pulse feedback is a slide-in option for the basic Snap-Pac motor control. It consists of two matched printed circuit boards that are plugged into the basic armature feedback control described in Section "A". The pulse feedback option provides improved speed regulation by sensing actual motor RPM through the use of a pulse tach generator mounted on the motor shaft Description of Operation The pulse feedback control circuitry is a full, closed loop amplifier that compares a speed command with an RPM feedback signal. The output of the pulse feedback module is fed directly into the basic Snap-Pac armature regulator as a reference voltage level via the slide pin connectors. A variable D.C. voltage from a speed setting potentiometer or other D.C. source is used as a command reference. A pulse frequency from an Extron motor mounted pulse ring pickup or other suitable frequency source is used as a feedback signal. The pulse signal is converted from a frequency signal to an analog signal. This analog feedback signal is compared to the reference command. The difference (error) is amplified and is used as the speed signal to the basic Snap-Pac armature feedback drive. The output signal of the pulse feedback module is optically isolated from the armature bridge. The input A.C. to the pulse feedback module is isolated via a step-down transformer. The analog feedback signal is also amplified and brought out to the terminal strip and can be used with a D.C. 1 ma meter for speed indication. Shutdown circuitry is also included to allow total shutdown of the drive reference when using contactor Start/Stop, Run Control, or reversing Adjustment Procedure Adjustments on basic control card a. High speed not used b. Low speed not used c. IR comp should be set full CCW d. Current limit this sets the maximum current that the motor can draw. This adjustment is normally set at 1 20% of rated motor armature current Pulse feedback option adjustments a. Maximum speed sets the maximum motor speed when the speed potentiometer is at maximum b. Minimum speed sets the minimum motor speed when the speed potentiometer is at minimum Note: The max. and min. adjustments interact to some degree; therefore, for best results it may be necessary to adjust both several times until the desired results are obtained. c. Stability Sets the system stability. Increasing this adjustment CW will tighten the loop response. To make this adjustment, turn this pot full CCW, then slowly turn it CW until the motor becomes unstable. Then back it off until the motor stabilizes at all speeds. d. Meter calibration This adjustment is used to calibrate a speed indicating meter for 1 00% at motor base speed Applicable Documents PD PC Schematic Diagram Basic Snap-Pac Schematic Diagram Pulse Feedback

9 SECTION C: TACHOMETER FEEDBACK Introduction Tachometer feedback is a slide-in option for the basic Snap-Pac motor control. It consists of two matched printed circuit boards that are plugged into the basic armature feedback control described in Section "A". The tachometer feedback option provides improved speed regulation by sensing actual motor RPMthroughthe use of a direct current tachometer generator mounted and coupled to the D.C. drive motor Description of Operation The tachometer feedback circuitry is a full closed loop amplifier that compares a speed command with an RPM feedback signal. The output of the tachometer feedback module is fed directly into the basic Snap-Pac armature regulator as a reference voltage level via the slide pin connectors. A variable D.C. voltage from a speed setting potentiometer or other D.C. source is used as a command reference. A D.C. tachometer generator voltage is used as a feedback signal. The command and feedback voltages are amplified and compared. The difference (error) is amplified and is used as the speed signal to the basic Snap-Pac armature feedback drive. The output signal of the tachometer feedback module is electrically isolated from the armature bridge. The input A.C. to the Tachometer feedback module is isolated via a step-down transformer. The D.C. tachometer feedback signal is also amplified and brought out to the terminal strip and can be used with a D.C. 1 ma meter for speed indication. Shutdown circuitry is included to allow total shutdown of the drive reference signal when using contactor Start/Stop or Run Control Adjustment Procedure Adjustments on basic control card a. High speed not used. b. Low speed not used. c IR comp should be set full CCW. d. Current limit this sets the maximum current that the motor can draw. This adjustment is normally set at 1 20% of rated motor armature current. Tachometer feedback option adjustments a. Maximum speed sets the maximum motor speed when the speed potentiometer is at maximum b. Minimum speed sets the minimum motor speed when the speed potentiometer is at minimum. Note: The max. and min. adjustments interact to some degree; therefore, for best results it may be necessary to adjust both several times until the desired results are obtained. c. Stability sets the system stability. Increasing this adjustment CW will tighten the loop response. To make this adjustment, turn this pot full CCW, then slowly turn it CW until the motor becomes unstable. Then back it off until the motor stabilizes at all speeds. d. Meter calibration This adjustment is used to calibrate a speed indicating meter for 100% at motor base speed Applicable Documents PD PC Schematic Basic Snap-Pac Schematic Tachometer Feedback

10 SECTION D: INSTRUMENT FOLLOWER ISOLATION OPTION Introduction Instrument follower is a slide-in option for the basic Snap-Pac motor control. It consists of two matched printed circuit boards that are plugged into the basic armature feedback control described in Section "A". The instrument follower allows standard Snap-Pac drives to be used with process control instrumentation. Standard process control signals of 1-5 ma, 4-20 ma, and ma can be used Description of Operation The instrument follower circuitry is used as a signal conditioner to allow using process instrument current signals as reference commands to the basic armature feedback Snap-Pac. Grounded or ungrounded signals of 1-5 ma, 4-20 ma, or ma are converted to voltage signals in the input section. The resulting voltage signal is amplified and optically coupled to the output section of the circuit. The output signal of the circuit is used as the speed reference to the basic Snap-Pac motor control. The output signal of the instrument follower is electrically isolated from the armature bridge. The input A.C. to the instrument follower module is isolated via a step-down transformer. The standard circuit also allows the standard Snap-Pac to follow any grounded or ungrounded voltage signal up to 7 volts D.C. maximum Adjustment Procedure 1. Adjustments on Basic Control Card a. High speed not used b. Low speed not used c. IR comp This adjustment corrects for speed loss when the motor is loaded. With the manual speed adjust pot at 1 5, measure the no-load speed of the motor, then load the motor and adjust the IR compensation until the no load speed is reached. If a manual speed adjust is not used, the same set-up procedure may be used by substituting an input signal that is 1 5% of the maximum. d. Current limit The current limit adjustment sets the maximum current that the motor can draw. This adjustment is normally set at 1 20% of rated motor armature current. 2. Adjustments on instrument follower option a. Min. speed Adjusts minimum speed of drive b. Max. speed (Balance) Adjusts maximum speed of drive Applicable Documents PD PC Schematic Basic Snap-Pac Schematic Instrument Follower

11 SECTION E: START/STOP OPTION Introduction Start/Stop with dynamic braking is a slide-in option to the Snap-Pac motor control. It consists of a printed circuit board and relay assembly that is plugged into either the basic armature feedback control or the pulse feedback, tachometer feedback or instrument follower option cards. The Start/Stop option allows remote operation of the control through the use of push button operators as well as offering motor dynamic braking and under voltage lockout Description of Operation The Start/Stop option consists of a full wave bridge rectifier that provides 24 VDC power from a stepped-down A.C. input voltage. The 24 Volt supply is used to operate a pilot relay that provides a holding contact for remote operation as well as a shutdown contact that is used to defeat the drive output when in the stop mode. A 2-pole, double throw power relay is used to connect the D.C. motor armature with the control. When this relay is de-energized, a dynamic braking resistor is connected across the armature of the D.C. motor to obtain braking of the D.C. motor The armature contactor may be 24 VDC or rated at A.C. supply voltage depending on the size of the drive. The dynamic braking resistors are sized to give approximately 100% current at full speed with no more than 3 full speed stops per minute Adjustment Procedure No adjustments are necessary Applicable Documents PC schematic Start/Stop 14-2 HP PC schematic Start/Stop 35 HP 3.6 SECTION F: REVERSING Introduction Reversing with dynamic braking is a slide-in option to the Snap-Pac motor control. It consists of a printed circuit board and relay assembly that is plugged into either the basic armature feedback control or the pulse feedback, tachometer feedback or instrument follower option cards. The reversing option allows remote reversing operation through the use of push button operators. Also included is motor dynamic braking and anti-plug circuitry Description of Operation The reversing option consists of a full wave bridge rectifier that provides 24 V.D.C. power from a stepped-down A.C. input voltage. The 24 volt supply is used to operate forward and reverse pilot relays as well as an anti-plug latching re lay. The forward and reverse pilot relays provide holding contacts for the forward and reverse operator control circuitry, defeat contacts to bring the dri ve o ut put to zeroifthe run contact is opened and contacts to engage and disengage the main forward or reverse armature contactor. The main forward and reverse contactors may be operated at 24 VDC or AC line voltage depending on the size of the drive. Anti-plugging is obtained by sensing armature voltage and using the voltage level to inhibit the engagement of the latching relay. The latching relay is a mechanically held, double coil device. Once the armature voltage has reached a low level, the latching relay is enabled. If the forward relays are then actuated, the latching relay will be held in the forward control circuit and lockout the reverse contactors. The drive will not reverse until the stop contact is opened, the armature voltage comes to zero, and the reverse relays are energized. The latching relay would not be in the reverse position until the reverse sequence of events occurs Adjustment Procedure No adjustments are necessary Applicable Documents PC Schematic reversing 1/4-2 HP PC Schematic reversing 3-5 HP

12 SECTION G: RUN CONTROL Introduction Run Control is a slide-in option to the Snap-Pac motor control. It consists of a printed circuit board that is plugged into either the basic armature feedback control or the pulse feedback, tachometer feedback, or instrument follower option cards. The run control allows remote operation of the control through the use of push button operators as well as offering under voltage protection Description of Operation The Run Control option consists of a full wave bridge rectifier that provides 24 VDC power from a stepped-down A.C. input voltage. The 24 volt supply is used to operate a pilot relay that provides a holding contact for remote operation as well as a shutdown contact that is used to defeat the drive output when in the "stop" mode Adjustment Procedure No adjustments are necessary Applicable Documents PC schematic PC schematic Run control 1/4-2 HP Run control 3-5 HP

13 4.0 TROUBLE SHOOTING PROCEDURE Most control failures are caused by improper connections, overloads, or improper protection from accumulation of dust dirt or moisture. Dirt and dust deposits limit the transfer of heat away from the power semi-conductors; and moisture, usually caused by either washdown or condensation, can cause short circuits, erratic operation, or insulation failure. WARNING HIGH VOLTAGE Do not service or trouble shoot the SCR drive without exercising extreme caution. The A.C. line should be disconnected before connecting test equipment such as oscilloscopes, voltmeters, or ammeters to the SCR drive. Test instruments must not ha ve their chassis grounded while tests are being made. The test equipment chassis will be "electrically hot" while connected during the test. CIRC UIT BRE AKE R TRIP S CHECK AC INPUT TO CONTROL SHORTED MOTOR FIELD CONT ACTO R WILL NOT ENER GIZE CON TRO L WILL NOT RUN MOT OR WILL NOT MAINTAIN SPEE D UNDE R LOAD CONT ROL WILL NOT RUN FULL SPEED IR COMP MISADJUSTED GAIN MISADJUSTED 1 DEFECTIVE SCR MODULE DEFECTIVE FIELD DIODE IMPROPER WIRING TO MOTOR DEFECTIVE MOTOR IMPROPER WIRING TO REMOTE STATION DEFECTIVE CONTROL CARD DEFECTIVE SPEED POT MIN. SPEED POT MISADJUSTED LOW LINE VOLTAGE CONT ROL WILL NOT SHUT OFF WITH SPEE D POT CURRENT LIMIT MISADJUSTED DEFECTIVE POWER BOARD MOT OR "PUL SAT ES" OPEN MOTOR FIELD MOTOR OVERLOADED CONT ROL RUNS FULL SPEE D (NO CONT ROL)

14 5.0 REPLACEMENT PARTS Parts common to all standard Snap-Pac Motor Controls Description Control Board Speed Pot, 5K, 2 Watt Pot Knob Extron Part No PC Parts special to all basic Snap-Pac Motor Controls Model 112, 113, &114 1/4-1/2 Hp 115 VAC Parts Description Power Board Power Module Circuit Breaker Extron Part No PC , 113 & 114 3/4-1 Hp 115 VAC Power Board Power Module Circuit Breaker PC , 113 & 114 1/2-1 Hp 230 VAC Power Board Power Module Circuit Breaker* PC , 113& / 2-2 Hp 230 VAC Power Board Power Module Circuit Breaker* PC , 116 & Hp 230 VAC Chassis or Nema 1 Power Board Power Module Circuit Breaker PC , 116 & Hp 230 VAC Nema 12 Power Board Power Module Circuit Breaker PC *Note: 230 VAC Breakers shown are 2pole. Older drives may have single pole breakers. Single pole breaker part number is

15 5.1 Standard Snap-Pac Slide-In Options Pulse Feedback VATO 1 HP VAC /2 to 2 HP Side Control Card Bottom Power Card PC PC Side Control Card Bottom Power Card PC PC VAC 3 to 5 HP 230 VAC Side Control Card Bottom Power Card PC PC Tachometer Feedback. 1/4 to 1 HP 110 VAC Vi to 2 HP Side Control Card Bottom Power Card 230 VAC 3 to 5 HP 230 VAC Side Control Card Bottom Power Card Side Control Card Bottom Power Card PC PC PC PC PC PC Instrument Follower/Isolated Module V4 to 1 HP 110 VAC Side Control Card Bottom Power Card Vi2to 2 HP 230 VAC Side Control Card Bottom Power Card 230 VAC 3 to 5 HP VAC ' 230 VAC 230 VAC PC PC Complete Assembly Complete Assembly Complete Assembly PC PC PC Reversing with Dynamic Braking 1/4 to 1 HP V2 to 2 HP 3 to 5 HP PC PC Start/Stop with Dynamic Braking V4 to 1 HP y2 to 2 HP 3 to 5 HP Side Control Card Bottom Power Card PC PC VAC 230 VAC 230 VAC Run Control 1 /4 to 1 HP 110 Complete Assembly Complete Assembly Complete Assembly VAC 1/2 to2hp PC PC PC VA

16 C 3 to 5 HP VAC Complete Assembly Complete Assembly Complete Assembly Printed circuit cards sold in matched pairs only PC PC PC

17 6.0 SCHEMATICS AND CONNECTION DIAGRAMS The following schematics and connection diagrams pertain to standard pre-engine&sed Extron Snap-Pac motor controls with a six (6) digit model number. If a control has a nine( 9) dg it model number or a ten(10)digit model number with an "M" prefix, please refer to the last page of this manual for a listing of schematics and wiring diagrams that pertain to the control. It is possible that some of the standard drawings in the following section will pertain to custom controls. Any drawings that cannot be found in the standard drawing section will be found loose in the back of this manual.

18 14.

19

20

21

22 18.

23

24 20.

25 21

26 22.

27

28 24.

29

30 27

31 28.

32 Factory Service and Warranty Information

33 Extron provides complete service for all products offered. Please contact your local Distributor or Representative for Return Authorization Procedures. A Return Authorization Number is required to process your unit quickly and return it to service. Service for units beyond the warranty period is available at standard published rates. Quotes on service costs are available upon request. ETRON COMPANY WARRANTY Extron warrants to the original purchaser all equipment and products manufactured by it and bearing its name to be free of defects in material and workmanship under normal use and service for a period of twelve (12) months from date of purchase from Extron. This warranty is applicable only if the Extron product and/or equipment is installed, operated and maintained in accordance with factory recommendations and procedures. In the event the Extron product and/or equipment is found to be defective within the above-stated twelve (12) month period, Extron will repair or replace defective parts if the product or equipment is shipped prepaid to Extron's factory and if such product and/or equipment is found by Extron's inspection to be truly defective in workmanship or material. Extron will return-ship such repaired product and/or equipment prepaid within the continental United States. If Extron's inspection does not disclose any defect in workmanship or material, repairs will be made at a reasonable charge. THE WARRANTIES SET FORTH HEREIN ARE IN LIEU OF ANY AND ALL OTHER WARRANTIES EPRESSED OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PURPOSE AND THE BUYER ACKNOWLEDGES THAT NO OTHER REPRESENTATIONS WERE MADE TO HIM OR RELIED UPON BY HIM WITH RESPECT TO THE QUALITY AND FUNCTION OF THE GOODS HEREIN SOLD. LIMITATIONS OF LIABILITY IN NO EVENT, WHETHER AS A RESULT OF BREACH OF CONTRACT, WARRANTY OR TORT (INCLUDING NEGLIGENCE), SHALL ETRON OR ITS SUPPLIERS BE LIABLE FOR ANY CONSEQUENTIAL OR INCIDENTAL DAMAGES, INCLUDING FOR PURPOSES OF ILLUSTRATION, BUT NOT FOR LIMITATION, LOSS OF PROFITS OR REVENUES, LOSS OF USE OF EQUIPMENT FURNISHED OR SERVICED BY ETRON, DAMAGE TO, OR LOSS OF USE OF, ANY ASSOCIATED EQUIPMENT, COST OF CAPITAL, COST OF SUBSTITUTE OR REPLACEMENT PRODUCTS, FACILITIES, SERVICE OR POWER, DOWN TIME COSTS, OR CLAIMS OF THE CUSTOMER'S CUSTOMER FOR SUCH DAMAGES. IF THE CUSTOMER TRANSFERS TITLE TO OR LEASES THE PRODUCTS SOLD OR SERVICED HEREUNDER TO ANY THIRD PARTY, THE CUSTOMER SHALL OBTAIN FROM SUCH THIRD PARTY A PROVISION AFFORDING TO THE COMPANY AND ITS SUPPLIERS THE PROTECTION OF THE PRECEDING SENTENCE, AND THE CUSTOMER WILL DEFEND AND HOLD ETRON HARMLESS FROM ANY CLAIMS OF SUCH THIRD PARTIES. ETRON'S LIABILITY ON ANY CLAIM OF ANY KIND (INCLUDING NEGLIGENCE) FOR ANY LOSS OR DAMAGE ARISING OUT OF OR RESULTING FROM THIS AGREEMENT, OR FROM THE PERFORMANCE OR BREACH THEREOF, OR FROM THE PRODUCTS OR SERVICES FURNISHED HEREUNDER, SHALL IN NO CASE ECEED THE PRICE OFTHE SPECIFIC PRODUCT OR SERVICE WHICH GIVES RISE TO THE CLAIM. ALL SUCH LIABILITY SHALL TERMINATE UPON THE EPIRATION OF THE WARRANTY PERIOD OF TWELVE ( 12) MONTHS, AS HEREINABOVE STATED. The furnishing of advice or other assistance without separate compensation therefore will not subject the company to any liability, either in contract, warranty, tort (including negligence), or otherwise. Each of the foregoing paragraphs in this article will apply to the full extent permitted by law. The invalidity, in whole or part, of any paragraph will not affect the remainder of such paragraph or any other paragraph LINDSAY ST Minneapolis, MN (763) Fax: (763)