Generac Power Systems PWRcell Reference Manual page 54

Section 8 PWRcell ATS
Transferring to Standby – Inverter Only Configuration
The inverter takes Wire 23 to ground. This energizes the internal transfer relay (TR) within the ATS PWRcell controller.
The TR contacts change state – opening on the UTILITY side (opens Wire N1A from Wire 126) – and closing on the
STANDBY side (connecting Wire E2 and 205). This allows inverter voltage to be applied to the standby coil. Inverter
voltage is already available to the coil from E1A. The voltage from E1 and E2 go to both sides of the bridge rectifier
(BR). The BR rectifies the AC voltage to DC voltage and applies it to either side of the closing coil. The closing coil
energizes and pulls the contactor to the STANDBY position.
In STANDBY the XB1 limit switch changes state and removes E2 inverter voltage from the coil. In the STANDBY
position the XA1 limit switch will also change state and go to its normally closed position, setting the switch up for the
next transfer.
013088
Figure 8-9. Transferring to Standby
50 Diagnostic Repair Manual