GE Zenith Controls ZTSCT/ZBTSCT Series Closed Transition Transfer & Transfer Bypass - Isolation Switches 100-4000 Amps 71R-5000A 11/04 Operation and Maintenance Manual
Authorized Service For GE parts and service, call: 773 299-6600 Table of Contents Page Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Equipment Inspection and Storage . . . . . . . . . .11 Final Equipment Inspection . . . . . . . . . . . . . . .11 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety DANGER HAZARDOUS VOLTAGE (Can Cause Severe Injury or Death) Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components. The safe operation of your switch is GE Zenith’s focus. The proper storage, installation, operation and maintenance will help increase the life of the switch. 3. 4.
Installation DANGER HAZARDOUS VOLTAGE (Can Cause Severe Injury or Death) Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components. Power Connections SPREADER BAR GE Zenith transfer switches are supplied with UL listed solderless screw type terminals as standard for the Source 1, Source 2 and Load power connections. Table 1 lists the number and sizes of cable lugs supplied as standard for each switch amp rating.
Installation (cont’d) DANGER HAZARDOUS VOLTAGE (Can Cause Severe Injury or Death) Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components. E Initial Energization 4 1 5 P Relay 2 (Engine Start) 6 3 Before proceeding, refer to the information package supplied with the ATS and read and understand the information on all accessories provided. Contact rating is 10 Ampere at 120VAC or 28VDC Gold plated Figure 2 1. 2. 3. Unlock the enclosure.
Installation (cont’d) Initial Energization (cont’d) After all options and accessories are checked and verified, follow these steps to set up the ATS. Refer to Entelli-Switch 250 display Figure 5. The annunciation LEDs illuminate to indicate (1) source availability, (2) ATS position, and (3) Entelli-Switch 250 control function (timing). 1. 2. 3. Unlock the enclosure. Open the enclosure. Place the Disconnect Switch in the Inhibit. NOTE: 4. This step is only performed if the “DS” Option was purchased.
Installation (cont’d) DANGER HAZARDOUS VOLTAGE (Can Cause Severe Injury or Death) Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.
Entelli-Switch 250 Controller Entelli-Switch 250 Controller Consists of two major assemblies: I. Engine Start Relay P The Microprocessor contains the following: I/O Interface A. B. II. Entelli-Switch 250 Board Entelli-Switch 250 Board - Customer Input and Output (I/O) for system interface. Located on the left hand side of the back of the unit (see figure 7) 1. I/O accessories that can be found here are: a. Engine start relay P output b. Pre-Signal to transfer T3, W3 and UMD output (optional) c.
Entelli-Switch 250 Controller (cont’d) LCD & Keypad These options are accessible through the LCD and keypad (see figure below). To become familiar with the options loaded into a particular unit, scrolling through the SET and CFG menu will show the descriptions of the options (see pages 16-17). These menus are the very same menus that are used to access the setting and/or configuration of these options. The SET (setting) menu is primarily used to show or change, time and voltage settings.
User Setting for Voltage & Frequency Standard 3-Phase Sensing on 3 and 4 Pole Units Source 1 Under Voltage "Restore" Factory Default: 90% This adjustment determines the minimum acceptable voltage required to transfer to Source 1. Adjust via the SET menu. Range is 85% to 100% in 1% increments (see page 17). Once satisfied, the T timer will begin timing to transfer to Source 1. Under Voltage "Fail" Factory Default: 80% This adjustment determines the low voltage threshold. Adjust via the SET menu.
Accessory Group Packages Table 3 Accessories STDS EXES Group Packages CONS SENS SPES PSGS 6P A1 A1E A3 2 2 2 2 3 A4 2 2 2 2 3 2 2 2 2 2 2 2 2 2 2 2 2 Calibrate CDT CDP DS** DT DW E EL/P K/P L1 L2 L3 L4 LN P1 Q2 Q3 Q7 R1-3 R15D R16 R50 S5P S12P S13P T T3/W3 U UMD VI W YEN 2 2 3 Standard Accessory included in the group package. Optional Accessory not included but can be added to group package. Optional Accessory. Can not be used with accessory having the same symbol.
Accessory Definitions 6P CDT Test Switch, Momentary Load or NO-Load. One event exerciser with adjustable Engine exercise timer. Exercise duration can be set between 5 and 60 minutes in 1 minute increments. Can be configured to run every 1, 7, 14, or 28 days. Factory Default is 20minutes. When exerciser is impending, (*E*) appears in the upper right hand corner of LCD screen. See page 14 for instructions. Configured via CFG (see page 17). Set via SET menu (see page 18).
Accessory Definitions (cont’d) M1 Q7 Single Phase Amp Meter Inhibit transfer to Source 1 circuit. Energize Q7 input to prevent transfer to Source 1.
Accessory Definitions (cont’d) R50 of BYPASS DELAY button YEN or if Source 2 fails. In Phase Monitor this feature restricts Live to Live Source Transfers to occur unless both Sources are within 7 electrical degrees or less of each other. (live Source to live Source transfers usually occur during transfer back to Source 1 or during Testing). R50 does not change the operation of the Automatic Transfer Switch in a power failure mode.
Accessory Definitions (cont’d) 5 minutes. Adjust via SET menu (see page 18) windows UMD W Universal Motor Load Disconnect Circuit: Auxiliary Contact opens 0-60 seconds prior to transfer in either direction, re-closes after transfer. Can be configured by end user for Pre-transfer, Post-transfer, or both. Time Delay (S2) Source 2 Stable Timer. To delay transfer to Source 2. Adjustable 0-5 minutes in 1 second increments. Standard setting is 1 second.
CDT One Event Timer Exerciser • Load / No-Load One event Exerciser with adjustable Timer. Exercise duration can be set between 5 and 60 minutes in 1 minute increments. Can be configured to run every 1,7,14, or 28 days. Factory default is 20 minutes. How to CONFIGURE (CFG) and Set (SET) the Timer Exerciser 1. Beginning from the S1 OK screen, press MORE then CFG. 2. Press MORE to scroll to CONFIG TIMER EXERCISER screen. 3.
CDP Clock Exerciser Load / No-Load Clock Exerciser Allows the Generator to start and run unloaded or to simulate a power failure, start Generator and run under load. Can be configured by the end user for 1, 7, 14, 28, or 365 day cycles. • A total of 7 independent No Load exercise periods (up to 10 hours each) can be programmed for each of the daily, weekly, 14-day, and 28-day exercisers. • A total of 12 independent No Load exercise periods (up to 10 hours) can be programmed for the 365-day Exerciser.
Entelli-Switch 250 User Setup - CFG Menu Turn options ON or OFF via keypad through the CFG menu Enter six digit access code (The factory assigned six-digit access code is located on the back of the controller) 1 2 4 5 WARNING 1 3 Controller Inputs must be relay Isolated. 6 A2 (-) Engine Start Relay (De-Energized) A1 (+) 14 RELAY Network Communications (Option) J2 * 11 12 COM J2-3 Customer Input Voltage N.O N.
Entelli-Switch 250 User Setup - SET Menu Change adjustable values through the SET menu. Enter six digit access code (The factory assigned six-digit access code is located on the back of the controller) 1 2 4 5 WARNING 1 3 Controller Inputs must be relay Isolated. 6 A2 (-) Engine Start Relay (De-Energized) A1 (+) 14 RELAY Network Communications (Option) J2 * 11 12 COM J2-3 Customer Input Voltage N.O N.
Entelli-Switch 250 User Setup - System Info View System Data Enter six digit access code (The factory assigned six-digit access code is located on the back of the controller) 1 2 4 5 WARNING 1 3 Controller Inputs must be relay Isolated. 6 A2 (-) Engine Start Relay (De-Energized) A1 (+) 14 RELAY Network Communications (Option) J2 * 11 12 COM J2-3 Customer Input Voltage N.O N.
Testing CAUTION Due to hazardous voltage and current, GE Zenith recommends that a GE Zenith Certified technician or a qualified electrician must perform the installation and maintenance of the switch. WARNING Both power sources must be disconnected before manual operation of the switch. Test Options The ATS can be tested in either of two positions: 1) “Auto Position” Full Transfer Test - This test checks the complete operation of the ATS by transferring the load’s power source from Source 1 to Source 2.
Testing (cont’d) NOTICE A periodic test of the transfer switch under load conditions is recommended to insure proper operation. (See National Electric Code articles 700 and 701) Open Transition SYSTEM TEST FA S T X F R NO MORE TEST LOAD XFR Figure 12 ATS Testing Start generator and verify proper voltage, frequency and phase sequence (match to Source 1). Shut down gen set and place in Auto. Complete the visual inspection of the transfer switch, and close the cabinet door.
Testing (cont’d) NOTICE A periodic test of the transfer switch under load conditions is recommended to insure proper operation. (See National Electric Code articles 700 and 701) Closed Transition GE Zenith Closed Transition Transfer Switches are designed to Transfer the Load between two available sources with out interrupting power to the Load (Make-Before-Break). Paralleling of the two sources occurs within a predefined window of synchronization and lasts less than 100 milliseconds.
Testing (cont’d) DANGER HAZARDOUS VOLTAGE (Can Cause Severe Injury or Death) Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components. Emergency Service Procedure for Extended Parallel Time ZTSCT Transfer Switch If Source 2 breaker shunt trip was triggered after an extended parallel time (malfunction) occurred. Follow these steps to open the transfer switch.
Sequence of Operation Open Transition Source 1 Power Failure: When Source 1 voltage or frequency has fallen below the preset "Fail" values, the controller initiates the Time Delay Source 2 Start (Engine Start Timer "P") cycle. Upon completion of the (P) time delay, an Engine start Signal is sent to Source 2. When Source 2 voltage and frequency reach the preset "Restore" values, the time delay to open Source 1 timer (W) begins its timing cycle to ensure voltage and frequency stabilization before re-transfer.
Sequence of Operation (cont’d) Closed Transition GE Zenith Closed Transition Transfer Switches are designed to Transfer the Load between two available sources with out interrupting power to the Load (Make-Before-Break). Paralleling of the two sources occurs within a predefined window of synchronization and lasts less than 100 milliseconds. The initial Source is then disconnected. The ATS defaults to an open transition transfer when Source 1 fails.
Sequence of Operation (cont’d) Bypass-Isolation Operation An automatic transfer switch equipped with a bypass-isolation switch provides the ability to withdraw the ATS for testing and/or maintenance purposes without interrupting the served load. Operation of the unit is quick and convenient requiring only one operator and less than one minute to complete.
Sequence of Operation (cont’d) 100-400 AMP 1) Automatic a) Manually operated Bypass Switch contacts (BN/BE) are open and ATS is supplying load. b) Disconnect Switch (DS) is in Auto. 2) To Bypass ATS a) Open bottom cabinet door and turn DS to Inhibit. b) Position manual bypass handle (MBH) to same power source as ATS. 3) To Test ATS a) Bypass per above instructions. b) Move ATS location handle (ALH) to Test location. c) Turn DS to Auto.
Sequence of Operation (cont’d) 600-1200 AMP 1) Automatic a) Manually operated Bypass Switch contacts (BN/BE) are open and ATS is supplying load. b) Disconnect Switch (DS) is in Auto. 2) To Bypass ATS a) Open bottom cabinet door and turn DS to Inhibit. b) Turn Bypass Selector Switch (BSS) to same power source as ATS c) Position manual bypass handle (MBH) upward. 3) To Test ATS a) Bypass per above instructions. b) Rotate crank mechanism counter-clockwise until ATS test light is illuminated.
Sequence of Operation (cont’d) 1600-4000 AMP 1) Automatic a) Manually operated Bypass Switch contacts (BN/BE) are open and ATS is supplying load. b) Disconnect Switch (DS) is in Auto. 2) To Bypass ATS a) Open bottom cabinet door and turn DS to Inhibit. b) Turn Bypass Selector Switch (BSS) to same power source as ATS c) Position manual bypass handle (MBH) upward. 3) To Test ATS a) Bypass per above instructions. b) Rotate crank mechanism counter-clockwise until ATS test light is illuminated.
Controls Power Supply (CPS) Closed Transition Each Entelli-Switch 250 microprocessor based ATS controller requires a Controls Power Supply (CPS) to apply line voltage to the ATS operator via SCRs. Also required is power for the Entelli-Switch 250 printed circuit board and an application of sensing voltage proportional to line voltage. This is accomplished by the GE Zenith Controls Controls Power Supply (CPS).
Relay/Transformer (R/T Box) (cont’d) Closed Transition CPS Schematic 20 21 22 30 31 32 XN1 - SOURCE 1 CONTROL TRANSFORMER XN2 - SOURCE 1 3 PHASE SENSING TRANSFORMER XE1 - SOURCE 2 CONTROL TRANSFORMER 10V XE2 - SOURCE 2 3 PHASE SENSING TRANSFORMER 907 XE2 904 906 11V 905 903 900 10V 904 24V 902 10V 807 806 11V 805 803 10V 804 902 800 24V XE1 XN2 804 XN1 900 (18) SOURCE 2 24V OUTPUT 800 SOURCE 1 24V OUTPUT 907 3-PHASE SOURCE 2 SENSING JC JC JC JC C.V. SCR-EO C.V.
Troubleshooting and Diagnostics DANGER HAZARDOUS VOLTAGES CAN CAUSE SEVERE INJURY OR DEATH. These charts may indicate problems that require authorized GE Zenith service personnel. Hazardous voltages may exist on termination plugs other than those that go into the Entelli-Switch 250. General Troubleshooting The following troubleshooting guide is used to recognize, and determine basic faults. When using this guide, it will ask several questions about the condition of the switch.
Maintenance and Testing CAUTION Due to hazardous voltage and current, GE Zenith recommends that a GE Zenith Certified technician or a qualified electrician must perform the installation and maintenance of the switch. WARNING Both power sources must be disconnected before manual operation of the switch. A preventive maintenance program will insure high reliability and long life for the transfer switch.
GE Zenith Controls ZTSCT / ZBTSCT Operation and Maintenance Manual (71R-5000A) 33 ■
GE Zenith Controls A Product of GE Industrial Systems General Electric Company 830 West 40 th Street, Chicago, IL 60609 USA 773 299-6600, Fax: 773 247-7805 www.geindustrial.
