NYC 9/11 Public Portal Document
PPS-Generators
If the engine fails to start after 4 adjustable cranking attempts
(factory set at 10 seconds on and 10 seconds off, adjustable from
5 to 30 seconds) or if any protective device should operate while
the engine is running, the engine shall be disconnected from
service and immediately stopped. The engine control logic shall
lock the failed set out of service and requires a manual reset.
The engine control logic shall include a provision for conversion
to single cycle cranking, adjustable from 35 to 210 seconds.
2) Five Position Engine Control Switch Operation
Stop/Reset - In this position, the engine shall not be capable of
starting and/or running. If the engine was shutdown due to the
operation of a protective device, the shutdown malfunction shall
be reset when the switch is moved to this position. If the engine
is running when the switch is moved to this position, it shall
immediately shut down.
Off/Cooldown - In this position, the engine shall shut down after
a cool down period.
Automatic - In this position, the engine control shall be in
readiness for fully automatic operation upon receipt of a start
signal.
Test-Off-Line - When placed in this position, the engine shall
start and run as if a start signal were received except it shall not
be connected to the bus unless a start signal is received. When
returned to the Automatic position, the engine will shut down.
Test-On-Line - When placed in this position, the engine shall
start, run and connect tot he bus as if a start signal were received.
When returned to the Automatic position, the circuit breaker will
open and the engine will run for its cooldown period before
shutting down.
d. Synchronizing Mode Selector Switch
The synchronizing mode selector shall have the following positions:
1) Permissive - In this position, the governor controls are
deactivated,. However, the synchronizer can operate as a passive
synch check relay and signal the closing of the generator breaker.
OEM PPS-41 Generators
7 WTC March 20, 1998
NYC-WTC_000166916
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