Generac Power Systems PWRcell Reference Manual page 60

Section 8 PWRcell ATS
Utility Source Voltage Failure – Generator Only Configuration
If Utility source voltage drops below 65% of nominal voltage for five (5) seconds, the controller will initiate engine start.
After the generator starts, a five (5) second engine warm-up timer is initiated. During this warm-up the generator is
running at rated frequency and voltage. Figure 8-8 is a schematic representation of the transfer switch with the
Generator running with voltage available to the transfer switch.
Generator voltage available on contactor terminals E1 and E2.
•
Controller logic is holding Wire 23 open from ground.
•
Generator voltage from terminal E2 is available at the standby coil (C2); generator voltage from Terminal E1 is
available to the transfer relay at Pin 9. The transfer relay is not energized so E1 voltage will not go through the
N.O. contact (4 & 6) to Wire 205.
NOTE: This is an example of Transfer Switch Operational Analysis. For troubleshooting use the operational analysis
with the appropriate wiring/schematic diagrams.
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Figure 8-15. Utility Source Voltage Failure
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Diagnostic Repair Manual