Technicolor - Thomson TS 870 General Theory of Operation, Typical Commissioning Procedures

TS 870 TRANSFER SWITCH

4.2.TYPICAL COMMISSIONING PROCEDURES

CAUTION:

Commissioning procedures must be performed by qualified personnel only. Ensure the Automatic Transfer Switch (ATS) Control Circuit Isolation Plug is disconnected prior to energizing the supply sources. Manually place the transfer switch mechanism in the neutral position prior to applying power. Failure to do so may result in equipment failure or personal injury.

Note: The TYPICAL AUTOMATIC TRANSFER SWITCH COMMISSIONING

PROCEDURES MODEL SERIES TS 870 (attached as “Appendix A ”) is provided for general information only pertaining to typical site installations and applications. Contact Thomson Technology for further information as may be required.

Note: An optional hand held, plug-in Service Display Module (SDM) is available for the TSC 80 Transfer Controller. The SDM module provides an LCD screen to display additional detailed information on the operation and settings of the TSC 80 controller for simplified servicing/trouble shooting procedures. For detailed information, refer to the separate SDM module instruction manual (PM065).

5.GENERAL THEORY OF OPERATION

5.1. STANDARD AUTOMATIC TRANSFER SWITCH

5.1.1. NORMAL OPERATION

When utility supply voltage drops below a preset nominal value (adjustable from 70% to 100% of nominal) on any phase, an engine start delay circuit is initiated and the transfer to utility supply signal will be removed (i.e. contact opening). Following expiry of the engine start delay period (adjustable from 0 to 60 sec.) an engine start signal (contact closure) will be given.

Once the engine starts, the transfer switch controller will monitor the generator voltage and frequency levels. Once the generator voltage and frequency rises above preset values (adjustable from 70% to 95% of nominal), the engine warm-up timer

PM062 REV 5 08/05/05 8 Thomson Technology