MOTOR GP-GEAR 2247040 - Caterpillar

when used with an automatic start/stop module. If the NFPA 110 alarm module is used with a manual start/stop module, the low lube oil pressure alarm light (LOPL) and audible alarm (ALM) will indicate a fault on startup and will turn off if the oil pressure builds to the proper level. When an alarm condition occurs, the proper alarm switch (located on the engine) closes to complete the circuit which will light the respective warning light and power the audible alarm.The audible alarm can be manually silenced by pushing the alarm disconnect switch (ADS) (line 23). When pushed, the switch ADS closes the circuit and energizes the alarm disconnect relay (ADR) (line 23). When energized, the relay ADR opens and closes its contacts across the following terminals: ADR (7 and 4) (line 22) - This contact closes to lock in relay ADR.ADR (7 and 1) (line 21) - This contact opens to de-energize (silence) the audible alarm. The ADR will remain locked in until the condition which triggered the alarm is fixed. When fixed, the warning light(s) will go out and de-energize relay ADR. This causes contacts ADR (7 and 4) to open and contacts ADR (7 and 1) to close. Contacts ADR (7 and 1) close so the alarm is armed for the next condition(s).Except for the low lube oil pressure alarm light (LOPL), all alarm circuits are armed all of the time. The LOPL is armed when the arming relay (AR) located in the automatic stop/start module energizes and closes contacts AR (6 and 9) (line 6).If the LOPL is armed (approximately 90 seconds after crank termination) and initial oil pressure is not built-up, the auxiliary switch (LOPAS 1) (line 5) remains closed to complete the circuit to fault indicators LOPL (line 6) and ALM (line 11).A second optional low oil pressure auxiliary switch (LOPAS 2) (line 6) works in combination with an oil pressure step switch ESS (OPSS). At a certain engine speed the ESS (OPSS) starts a 90 second time delay, after which it closes. If oil pressure is not enough to have opened switch (LOPAS 2) then LOPAS 2 completes the circuit to the low oil pressure indicator (LOPL) (line 6) and the ALM (line 11).The engine failure relay (ENFR) has a contact across normally open contacts ENFR (9 and 6) (line 21) to allow use of the audio alarm (ALM) (line 21) in case of an engine overspeed or an overcrank fault. This does not cause any of the warning lights on the alarm module to light.When the engine has a normal shutdown. The relay (AR) de-energizes opening contacts AR (6 and 9) and keeps the alarm system from activating.Governor Switch
The optional governor switch is available on control panels using the Caterpillar Hydra-Mechanical or PSG governors equipped with synchronizing motors.After crank termination, the governor switch (GS) is enabled (allowed to operate), permitting a change in engine rpm (generator frequency). Move the switch up to increase rpm, down to decrease rpm. The governor