3.4.3.3. 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
Gensets (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 (Genset) on/off load to try to balance engine
running hours as stored in memory. Refer to programming section 5 for further
details. Note: the “trouble alarm” operation feature requires a digital
programmable inputs (i.e. Default inputs Source 1 –IP13, Source 2 –IP14) to be
pre-configured and wired to the appropriate engine-generator set controller.
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