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Transfer Switches - LakeShore — 3. The adjustment of the operating mechanism

A Transfer Switches - LakeShore service procedure — check it applies to your exact model before use.

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Procedure

  1. 4. The motor and microswitches The troubleshooting procedures outlined here are designed to test the control circuit and the oper- ating mechanism of the transfer switch. It is, therefore, necessary that all factors external to the transfer switch be correct, and that all accessory devices which are not imperative to switch op- eration either operate satisfactorily or bypassed and jumpered out of the circuit. Many of the accessory devices described below may not exist in the transfer switch being exam- ined. The proper wiring diagrams should be on hand before beginning work on the switch. We recommend that the entire manual be read before attempting to make any adjustment. Above all, CAUTION is recommended. Many of the troubleshooting tests require a simulated failure of the normal source. This can be done with the Load Test Switch. I. NORMAL POWER FAILS - ENGINE DOES NOT START
  2. 1. Maintenance Disconnect Switch (MDS) Verify that the maintenance disconnect switch is in the "NORMAL" position.
  3. 2. Selector Switch (SS) Verify that the Selector Switch is in the "AUTOMATIC" position.
  4. 3. Outage Delay Relay (ODR) Defective Disconnect the wires connected to Terminals 28 and 29 of the Printed Circuit Board. Then place an OHM-Meter or continuity checker on terminals 28 & 29. If the meter indicates a closed or short circuit, the ODR is okay; continue to Step 3. If the meter indicates an open circuit, the ODR is defective.
  5. 4. Engine Batteries Bad a. Check engine battery voltage. If voltage is proper, continue to Step b. b. Place generator control in the manual position to crank engine. If engine fails to crank, troubleshoot the engine starting system. II. ENGINE STARTS - AUTOMATIC TRANSFER SWITCH WILL NOT TRANSFER TO EMERGENCY
  6. 1. Improper Generator Voltage Using an appropriately set voltmeter, check the Generator output voltage on terminals EL1 to EL2, and EL2 to EL3, and EL3 to EL1. If each set of readings indicate the generator's proper line to line voltage, continue to Step 2. If the readings do not indicate proper line to line voltage, further checks are required on the generator, generator circuit breaker and/or voltage regulator.
  7. 2. Frequency Voltage Relay Not Energizing (FVR) a. Using an appropriately set voltmeter, check the voltage on terminals 23 to 25 (23 to NE for transfer switches without control transformers). If the reading is 120 VAC nominal, continue to Step b. If the reading is not 120 VAC nominal, check the ECT transformer and/or return to Step 1. b. Using an appropriately set voltmeter, check the voltage at the input of the FVR ter- minals (0 to 120). If the voltage is 120 VAC nominal, continue to Step c. If the reading is not 120 VAC nominal, the circuit between ECT and the FVR is broken. Sept. 2003 23 c. Check the voltage at the terminals 16 to 25 (16 to NE for transfer switches without control transformers). If this voltage is 120 VAC nominal, continue to Step d. If it is not 120 VAC nominal, replace ODR 2 Relay. d. Check the voltage at terminal 18 to 25 (18 to NE for transfer switches without con- trol transformers). If this voltage is 120 VA

Source: manual:Styles 2, 3 and T-200 New Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.