TS 880 TRANSFER SWITCH
PM064 REV8 10/01/25 11 Thomson Technology
4.2. TYPICAL COMMISSIONING PROCEDURES
CAUTION!!!
Commissioning procedures must be performed by qualified
personnel only. Ensure the Automatic Transfer Switch
(ATS) 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 880 (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.
5. GENERAL THEORY OF OPERATION
5.1. STANDARD AUTOMATIC TRANSFER SWITCH
5.1.1. NORMAL SEQUENCE OF OPERATION - OPEN TRANSITION
TYPE TRANSFER SWITCHES
When utility supply voltage drops below a preset nominal value (adjustable from
70% to 99% 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. Once the generator voltage and frequency rises above
preset values (adjustable from 70% to 99% of nominal), the engine warmup timer
will be initiated. Once the warmup 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 operated mechanism. Note: A neutral delay timer circuit will
delay the transfer sequence in the neutral position (i.e. both power-switching devices
open) until the selected time expires (adjustable from 0 to 60 sec.).
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