Static Transfer Switch (STS) For LCE-H Series Inverters

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1 Page 1 of 16 Static Transfer Switch (STS) For LCE-H Series Inverters Theory of Operation and User s Manual (May 2005, Revision A)

2 Page 2 of 16 Table of Contents 1 Introduction Description and Operation Operating mode On-Line Configuration Off-Line Configuration Mechanical Features: Description of functions Starting and running sequence User Interface Error message list: Protections and Alarms Internal Electronic Protection Fuse Protection Remote Control and Alarms Remote On/Off Minor and Major alarms on free potential contacts through X32 (see figure 5) Load position on free potential contacts through X33 (see figure 6) Technical Datasheet Voltage Specifications Current Specifications Frequency specifications Transfer Performance Voltage conformity /230 Vrms voltage: /120 Vrms voltage: Electromagnetic Compatibility Standards applied for immunity Standards applied for emissions Efficiency Temperature Safety Dimension and weight Installation and Commissioning Installation Commissioning Starting with mains present: Starting without mains present: Troubleshooting guide You switch ON the local switch and the system doesn t start Alarm messages and terminal configuration Mechanical Drawings A STS A STS... 19

3 Page 3 of 16 1 Introduction The STS is a fast, automatic transfer switch intended for the transfer of one load from an LCE inverter system to a second source of AC voltage or vice-versa. There are two versions: One is designed for use in systems with max current ratings of 150A, the other in systems with max current ratings of 65A, both with natural cooling. Part numbering as follows: IC-STS150-xxx and IC-STS65-xxx respectively where xxx = 120vac or 220vac). It allows the redundant inverter system to work in an ON LINE or OFF LINE mode, depending on application requirements. It is provided with: LED based synopsis showing the system status (load position, synchronized or a- synchronized, overload, minor and major alarms, voltage source conformity) An on/off switch to control the start and stop of the inverter modules A DB9 connector to connect a PC to configure the STS (via hyper terminal). An alarm connector allowing inverter control and information from the system to be communicated remotely through free potential contacts. A load position connector giving information about the current position of the load through potential contacts. For detailed technical data, please refer to Chapter 5.

4 Page 4 of 16 2 Description and Operation 2.1 Operating mode The operator can choose between 2 operating modes Mode 1: The load is supplied primarily by the inverters with assistance (general power failure) or temporary assistance (overload, short-circuit, module failure) from AC mains as needed. Mode 2: The load is supplied primarily by AC mains with assistance from the inverter system as needed (Mains voltage failure or frequency out of range) On-Line Configuration Operating Principles: Fig. 1 shows the operating principle of a parallel inverter system assisted by an STS. The load is normally powered by the inverters which the STS holds synchronized to the mains (SY process). When a fault occurs on the AC power bus of the inverters, the STS detects it and a commutation sequence is started thanks to the two thyristor pairs TH1 and TH Off-Line Configuration Operating Principles: Fig. 1 shows the operating principle of this second configuration. Normally, the load is powered by the auxiliary source. The inverters set in parallel are running in a no-load mode and synchronized to the mains by means of the SY process located in the STS. The STS permanently monitors the AC mains. If any fault is detected, a commutation sequence is started thanks to the two thyristor pairs TH1 and TH2. 5 seconds after the AC mains returns to normal, the loads are reconnected, without cut-off to the mains.

5 Page 5 of 16 STM150 And STM Mechanical Features: Figure 1 The static switch STS is built into the form of a 19 rack, 3U high. All power connections are on the front and shown in figure 2a. Located on the lateral right side are (see figure 2b): The output alarms (X32) and load position status (X33) available on screw terminals The terminal for a remote on/off control and synchro pulse + synchro relay available on 2 nd screw terminal (X31).

6 Page 6 of 16 Note: The 65A STS has no heatsink at the rear. The control card has the following function: Digital control of the STS To watch the limit temperature on the rear heat sink To monitor the unit and provide status synopsis through the LED display Synchronization and source transfer management To allow the user to change STS parameters using the hyper terminal RS232 connection with a PC. For full mechanical drawings please refer to Section 9: Mechanical Drawings

7 re 2 Page 7 of 16 3 Description of Functions Figure 3: Front Panel 1. Inverter switch on/off 2. Connector DB9 for serial interfacing (X10) LEDs to indicate STS status Parameter adjustment can be made through PC hyper terminal. 3.1 Starting and running sequence As soon as an AC voltage is connected to the mains terminal, the auxiliary power supply starts. The front on/off switch is used to start the inverter modules of the system. The choice between on line and off line mode will govern the following steps. In On-Line Mode: If mains were present when starting the inverter, the load was supplied by the mains and will be supplied (without voltage interruption) by the inverter after the previous starting operation thanks in part to the transfer conduction from thyristor pair TH1 To TH2. If mains were not present, the load was not supplied and will be supplied by the inverters through the thyristor pair TH1 after the starting sequence. In Off-Line Mode: If mains were present when starting the inverter, the load was supplied by the mains and will remain supplied by the mains after the previous starting operation. The inverter runs and remains in this standby state until AC mains remains in the voltage conformity range. If mains were not present, the load was not supplied and will be supplied by the inverter through the thyristor pair TH2 after the starting sequence. For more details on the setting up the system please refer to Section 7: Installation, Commissioning.

8 Page 8 of 16 If problems occur, please refer to Section 8: Troubleshooting 4 User Interface The user interface is located on the front panel. It consists of: 11 LEDs to display the STS status 1 on/off switch to start/stop the TDI LCE Inverters. +5VDC synchro relay (ref. to Ne) Sync Pulse Inverters On/Off Ne X31 1 DB9 hyper terminal connector Please refer to figure 3 of this manual for more detail. 4.1 Error message list: Major alarms: Mains Failure : Mains failure (in the off line mode) INV Bus Failure : Inverter fault (in the on line mode) Mains Not Conform : Mains voltage out of range (in the off line mode) Inv Bus Not Conform : Inverter voltage out of range (in the on line mode) Overload Imax : Inverter current > I nominal Vout Not Conform : No voltage (or bad) on load (in both modes) Inv Bus off : The inverter is switched off by the local front switch (in on line mode). Backfeed Protection : A backfeed is detected (both sources are disconnected) Minor alarms: Out of synchro : Inverter system no synchronized Imminent Switch : Imminent supply by mains (after 5 sec in off line mode) Mains failure : Mains failure (in on line mode) Inv Bus Failure : Inverter system fault (in off line mode) Mains Not Conform : Mains voltage out of range Inv Bus Not Conform : System inverter voltage out of range (in off line mode) Inv Bus Off : The inverter is intentionally switched off by the local front switch (in off line mode).

9 Page 9 of 16

10 Page 10 of 16 5 Protections and Alarms 5.1 Internal Electronic Protection The STS static switch is provided with internal electronic protection(s). The reported alarms can be seen locally (alarm LEDs, DB9 PC connection, free potential contacts). 5.2 Fuse Protection The STS static switch is internally protected by fuses F1 and F2 (fuse T2AH). 5.3 Remote Control and Alarms Remote On/Off The synchro relay mounted inside the LCE inverter shelf MUST be rated 5VDC (example: Zettler model AZ832-2C5DSE UR-CSA) Minor and Major alarms on free potential contacts through X32 (see figure 5) The connector X32 located on the right side of the unit gives the alarms Major and Minor available on free potential changeover contacts: Major: load supplied by the emergency source Minor: Non-conformity of the mains (or inverter power bus); asynchronism, inverter fault. An in-depth analysis of Major and Minor alarms is locally possible by consulting the LEDs on the front panel and the RS232 terminal menus. Terminal 1,2,3 for Major (1-2 closed and 1-3 open if an Major alarm is present). Terminal 4,5,6 for Minor (4-5 closed and 4-6 open if a Minor alarm is present). Figure 4

11 Page 11 of Load position on free potential contacts through X33 (see figure 6) The connector X33 located on the right side of the unit indicates which source is supplying the load. This information is available on free potential changeover contacts: Load supplied by inverter bus or Load supplied by mains An in-depth analysis is locally possible by consulting the LEDs on the front panel and the display of the unit. Terminal 1,2,3 for Load on Inverter Bus (1-3 closed and 1-2 open if the load is at the right place). Terminal 4,5,6 for Load on Mains (4-5 closed and 4-5 open if the load is at the right place). Figure 5

12 Page 12 of 16 6 Technical Datasheet 6.1 Voltage Specifications Operating Voltage Range 6.2 Current Specifications Maximum Permanent current 6.3 Frequency specifications Frequency Range 6.4 Transfer Performance Transfer time Total transient voltage duration 180 to 265 VAC, or, 90 to 150 VAC 150A (65A) in natural cooling 47.5 to 52.5, or, 57.5 to 62.5 Hz 0.5 msec to 3 msec (typ: 1.5 msec) 0.5 msec to 10 msec (typ: 5 msec) 6.5 Voltage conformity /230 VAC voltage: Maximum mains voltage conformity Minimum mains voltage conformity Minimum inverter voltage conformity Maximum inverter voltage conformity /120 VAC voltage: Maximum mains voltage conformity Minimum mains voltage conformity Minimum inverter voltage conformity Maximum inverter voltage conformity Adjustable in the range 245 to 265 V (default factory value: 258 VAC) Adjustable in the range 150 to 210 V (default factory value: 202 VAC) Adjustable in the range 150 to 210 V (default factory value: 202 VAC) Adjustable in the range 245 to 265 V (default factory value 258 VAC) adjustable in the range 125 to 145 V (default factory value: 135 VAC) adjustable in the range 82 to 108 V (default factory value: 105 VAC) adjustable in the range 82 to 108 V (default factory value: 105 VAC) adjustable in the range 125 to 145 V (default factory value: 135 VAC) 6.6 Electromagnetic Compatibility Performance criteria, test levels and characteristics are specified in the standard ETS if not specified Standards applied for immunity IEC IEC IEC IEC IEC

13 Page 13 of Standards applied for emissions CISPR 22 Class A 6.7 Efficiency 97% at nominal voltage and nominal resistive load 6.8 Temperature Storage Temperature -40 to +80 C Permissible ambient temperature 0 to 50 C MTBF 250,000 hrs according to MIL-HDBK- 217F method 6.9 Safety IEC950 UL1950 (pending) 6.10 Dimension and weight Dimensions W x H x D 150A: x 5.31 x mm x 135mm x 348mm 65A: x 5.31 x mm x 135mm x 312mm Weight (approximately) 150A: 19.8 lbs (9Kg) 65A: 16.5 lbs. (7.5Kg)

14 Page 14 of 16 7 Installation and Commissioning 7.1 Installation Please refer to Figure 2 of this manual for item identification and the simplified connection schematic Figure Install the module in the rack (mechanical fixing + AC connection + earth connections + alarm contact connections). We advise using a cable eye for the earth connection. 2. Secure / Mount the module to the cabinet 3. Plug in the triple AC power connector X22, X21, X24 4. Plug in the remote on/off connector X31 5. Plug in the Alarm connectors X32 and X33 6. Plug in the neutral to the connector N The module is installed and ready for use. STS 150 And STS 65 Figure 6: AC Connections to the STS NOTE: The input AC grid must be protected by fuses or breaker (maximum: 180A for the STS150, 80A for the STS65)

15 Page 15 of Commissioning Starting with mains present: 1. Set the AC Power ON 2. Set the DC Power ON 3. Turn on the front switch of the STS Starting without mains present: 1. Set the DC power ON 2. Set the individual DC breaker ON (if there are present) 3. Turn on the front switch of the STS If the modules don t start please refer to the troubleshooting section

16 Page 16 of 16 8 Troubleshooting guide 8.1 You switch ON the local switch and the system doesn t start 1. Check the remote connection (pins 5 and 6 of X31 on lateral side of the STS) and verify the presence of a DC voltage at the input of the modules. 2. Modules can be started through 2 different modes: a. Remotely through STS front panel switch and/or b. Remote ON/OFF contact (which must be closed to turn the modules on ). 8.2 Alarm messages and terminal configuration The STS can make the independent/automatic decision to transfer the load to the emergency source for internal or external reason(s). The error list (see Section 4: User Interface) gives the various reasons for alarm messages to be displayed. These messages are accessible through PC interface via RS232 DB9 front panel connector. To connect a PC to the STM, follow these instructions: Classical null modem DB9 cable Terminal configuration: bits/sec data bits / No parity / 1 stop bit / no flux control Menu password: conf Select menu 1 to display STS info (including alarms). Follow the indications given by the STS to see/modify/save the configuration parameters.

17 Page 17 of 16 9 Mechanical Drawings A STS

18 Page 18 of 16

19 Page 19 of A STS

20 Page 20 of 16

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