TS 880 TRANSFER SWITCH
PM064 REV8 10/01/25 16 Thomson Technology
Note: The maximum time period both sources will remain paralleled under
this failure mode is 200 milliseconds.
q The original source (i.e. prior to the transfer sequence) will remain on load,
separated from the other source. An alarm light and TSC 800 controller will
indicate a failure condition which must be manually reset before the transfer
switch will re-attempt subsequent transfers. For further information on the
TSC 800 features and operation, refer to the separate product instruction
manual.
Note: Two alarm contacts are provided for the Closed Transition Failure Mode
(i.e. one for a failed generator power switching device and one for the utility
power switching device. The contacts are wired to terminal blocks for customer
use to remotely trip open upstream devices should an abnormal condition
persist.
5. Transfer Fail Alarm (Switching Device Fail to Close): A control timer (TFT) is
provided to detect and alarm abnormal operating conditions. Should a power
switching device fail to close for any reason within a 5 minute time period, an
alarm light and alarm relay contact will be activated. The TSC 800 transfer
controller also includes a time delay and alarm feature. For further information
on the TSC 800 features and operation, refer to the separate product instruction
manual.
5.2. SERVICE ENTRANCE AUTOMATIC TRANSFER SWITCH
Note: This applies only to service entrance transfer switches
5.2.1. NORMAL OPERATION
Under normal conditions, the load is energized from the utility supply through the
closed utility transfer power switching device. If the utility power fails, the generator
will start and the load will be re-energized via the closed generator transfer power
switching device.
In the normal operating mode, the Service Disconnect switch shall be in the
“energized” position.
To Next Page
Loading...
