3.4.6. ABNORMAL SEQUENCE OF OPERATION
3.4.6.1. GENERATOR FAILURE ON LOAD
Should the generator set fail while on load, the transfer switch will automatically
re-transfer the load back to the utility supply if within nominal limits. The utility
return timer will be bypassed in this condition.
NOTE:
This operating condition applies to a normal utility failure as well
as any test condition.
3.4.6.2. TRANSFER SWITCH FAIL ALARM LOGIC
The TSC 900 controller contains logic to detect a transfer mechanism failure.
Should a failure be detected, a forced transfer to the alternate supply will be
initiated if the TSC 900 is programmed for force transfer. Refer to the
programming Section 5.11.6 for further information in Force Transfer operation.
3.4.6.3. SERVICE ENTRANCE ATS
Service Entrance Rated ATS’s provide a manually initiated operation sequence
which signals the ATS mechanism to transfer from either connected source to
the neutral position to de-energize the ATS Load. This operation mode is
activated by the Service Disconnect control switch. Once in the Service
Disconnected mode, the TSC 900’s transfer control outputs and engine start
circuits are disabled. When the Service Disconnect control switch is de-activated,
the ATS will transfer back to the available source to re-energize the ATS Load.
Note: the TSC 900 programmable digital input for Service Disconnect mode must
be used in conjunction with a Service Disconnect control switch which changes
the source of control power to the TSC 900 output contacts to enable transfer to
the neutral position.
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