TS 870 Transfer Switch
PM062 REV 11 16/04/19
25
Thomson Power Systems
Source Delay
timer expires. When the Preferred selected generator is returned to
normal operating status, the load will automatically retransfer back to the Preferred
selected generator once the Return to Preferred Source Delay
timer expires. If the
Preferred Source Selector switch is turned to the non-operating generator, the load will
automatically transfer to this new Preferred generator once the Transfer From
Preferred Source Delay
timer expires. The originally selected Preferred unit will
continue to operate for its cool down period then stop. An automatic Engine Run-Hour
balancing program is provided for configuration/use in the Dual Prime Mode. When
enabled it will automatically start/stop and transfer each engine (generator set) on/off
load to try to balance engine running hours as stored in memory. Refer to TSC 900
Instruction manual for detailed programming instructions.
5.3.3. DUAL STANDBY GENERATOR ATS
Under normal Utility Power operation, power to the load will be fed from the Master
ATS via closed Utility power switching device. The Dual Standby (Slave) ATS remains
de-energized with both generators stopped. Should the utility power fail, the Master
ATS will send a common gen start signal to the Dual Standby ATS. The Dual Standby
ATS will then send a start signal to one or both generator sets (programmable) to start.
The Dual Standby ATS will transfer to the Preferred selected generator position. Once
generator voltage is established back to the Master ATS, the load will automatically
transfer onto the operating generator. The Standby Gen will automatically stop if
selected to do so. The Preferred selected generator will be continuously connected to
the load via the Master ATS until Utility Power is re-established. Should the Preferred
generator fail while on load, the standby selected generator set will automatically start
and the load will be automatically transferred to the standby generator. When the utility
power returns to normal, the Master ATS will transfer the load back to the utility supply
and will send a signal to the Dual Standby ATS to stop the operating generator. The
operating generator unit will continue to run for its cool down period then stop. An
automatic Engine Run-Hour balancing program is provided for configuration/use in the
Dual Prime Mode. When enabled it will automatically start/stop and transfer each
engine (generator set) on/off load to try to balance engine running hours as stored in
memory. Refer to TSC 900 Instruction manual for detailed programming instructions.
5.4.
SERVICE ENTRANCE RATED ATS
NOTE:
This section applies only to Service Entrance configured transfer switches.
5.4.1. NORMAL OPERATION
Under normal conditions, the load is energized from the utility supply through the closed
utility transfer power switching device. If the utility power fails, the generator will start
and the load will be re-energized via the closed generator transfer power switching
device. In the normal operating mode, the Service Disconnect switch shall be in the
energized position.
Summary of Contents for TS 870
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