ADAPTER AS 4464972 - Caterpillar

Synchronization Sequence Of Operation
Note: Before attempting to execute these functions, ensure that the Synchronization Tuning Procedure has been completed.Automatic Synchronization Mode
Dead Bus Close
For automatic synchronization, the ECS and PCS must be in the AUTO position. The following sequence of operations assumes the switches are in these positions. Changing either of these switch positions will interrupt the automatic mode of operation and prevent the circuit breaker from automatically closing.
Upon receipt of a remote system start signal, the generator set will start and begin ramping to rated speed and voltage.
As the generator set reaches approximately 90% speed and voltage, the Voltage Frequency Relay (VFR) of that generator set will energize. This will energize the Voltage Build up Relay (VBR).
The first generator set to energize VBR will initiate the dead bus close sequence and will inhibit the other generator set from closing to the dead bus. If the first generator sets circuit breaker does not close after 2 seconds, it will pass dead bus close control to the second generator set. The second generator set will inhibit the first generator set from closing to the dead bus and attempt to close its circuit breaker to the dead bus. If the second generator sets circuit breaker does not close after 2 seconds (field adjustable), it will pass dead bus close control back to the first generator set. This process continues until one of the generator sets closes to the dead bus or the fail to parallel time delay expires. Detailed explanation follows:
As the first generator set reaches 90% rated speed and voltage, the VBR relay energizes. The dead bus circuit confirms the bus is dead through a DBR contact.
After a 0.25 second delay, the Dead Bus Permissive Timer (DBPT) will close its contact, energizing the Dead Bus Permissive Relay (DBPR). When DBPR energizes in the first generator set, the normally closed contact wired to the second generator set opens, preventing it from closing to the dead bus
After a 0.25 second delay, the DBTR energizes. The contact from this relay is fed into the GSC+P Auto Sync logic, starting the process of an automatic dead bus closure.
If the circuit breaker does not close within 2 seconds, the Dead Bus Alternate Timing Relay (DBATR) will energize, and stop the automatic dead bus close sequence for the first generator set. The second generator set will then begin the automatic dead bus close sequence, starting at step 4.babove.
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