TS 870 Transfer Switch
PM062 REV 11 16/04/19
19
Thomson Power Systems
4.4.
TYPICAL COMMISSIONING PROCEDURES
CAUTION
Commissioning procedures must be performed by
qualified personnel only. Ensure the Automatic
Transfer Switch (ATS) ATS Power Chassis & Voltage
Sensing Isolation Plugs
PL12 & PL 15 are 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, Appendix A, is provided for general information only pertaining to typical site installations
and applications. Contact
Thomson Power Systems for further information
as may be required.
5.
AUTOMATIC SEQUENCE OF OPERATION
5.1.
STANDARD ATS - OPEN TRANSITION
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 will be
initiated. Once the warm-up timer expires (adjustable from 0 to 60 min.), the Transfer
to Generator Supply signal (contact closure) will be given to the transfer switch
mechanism. The load will then transfer from the utility supply to the generator supply
via the motor driven mechanism.
The generator will continue to supply the load until the utility supply has returned. The
retransfer sequence is completed as follows: when the utility supply voltage is restored
to above the preset values (adjustable from 70% to 95% of nominal) on all phases, a
transfer return delay circuit will be initiated. Following expiry of the Utility Return Timer
(adjustable from 0 to 60 min.), the Transfer to Generator Supply signal will be removed
(contact opening), then the Transfer to Utility Supply signal (contact closure) will be
given to the transfer switch mechanism. The ATS will then retransfer the load from the
generator supply back to the utility supply.
Summary of Contents for TS 870
Page 2: ......
Page 12: ...TS 870 Transfer Switch PM062 REV 11 16 04 19 10 Thomson Power Systems ...
Page 13: ...TS 870 Transfer Switch PM062 REV 11 16 04 19 11 Thomson Power Systems ...
Page 34: ...TS 870 Transfer Switch PM062 REV 11 16 04 19 32 Thomson Power Systems ...
Page 63: ...TS 870 Transfer Switch PM062 REV 11 16 04 19 61 Thomson Power Systems 18 NOTES ...
Page 74: ......
Page 76: ......
