remain off load. The standby source will automatically transfer on load should
the “Preferred” source fail once the “Transfer From Preferred Source Delay”
timer expires. When the “Preferred” selected source is returned to normal
operating status, the load will automatically retransfer back to the “Preferred”
selected source once the “Return to Preferred Source Delay” timer expires. If the
PREFERRED SOURCE selector switch is turned to the non-operating source,
the load will automatically transfer to this new “Preferred” source once the
“Transfer From Preferred Source Delay” timer expires.
3.4.3.2. DUAL PRIME GENERATOR ATS
A Dual Prime Generator application allows an operator to select which generator
is “preferred” (i.e. Either generator may be selected as Preferred), therefore, the
alternate generator will act as the standby source. The “PREFERRED” selected
generator will continuously operate on load with an engine start signal
maintained. The non-selected preferred generator (standby) will remain off load.
The standby generator will be signaled to automatically start the engine and
transfer on load (following its warm up delay period) should the “Preferred”
generator fail once the “Transfer From Preferred 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
(Genset) on/off load to try to balance engine running hours as stored in memory.
Refer to programming section 5 for further details. Should a “trouble alarm” occur
on the operating “Preferred” source, the ATS will automatically transfer to the
“Standby Source until the trouble alarm condition is reset. 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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