RADIATOR GP 2105948 - Caterpillar

General System Description
The control panel is normally used for prime power operation and only operates with engine systems that are energized to run. The control panel will shut down the generator set when an engine fault occurs. At the same time, it will indicate by a fault lamp whether the fault is due to high water temperature, low oil pressure, engine overspeed, or spare fault (if connected).Key Switch Operation
Key Switch In START Position
DC Schematic Of Key Switch In START PositionWhen the key switch (KS) is in the START position, KS contacts B and S (lines 11 and 10) and contacts B and R (lines 11 and 13) are closed. The starting motor magnetic switch (SMMS1) (line 9) is now energized. SMMS1 closes it's contact (line 6) to energize the pinion solenoid (PS1) (line 6). PS1 closes it's contact (line 5) to energize the starting motor (SM1) (line 5). The slave relay (SR1) (line 13) is also energized when the KS is in the START position. SR1 contacts 30 and 87 (line 7) close to energize the fuel solenoid (FS). Fuel is now provided to the engine during starting.Key Switch In RUN Position
DC Schematic Of Key Switch In RUN PositionAfter the engine starts and the key switch (KS) is returned to the RUN position, KS contacts B and S (line 11 and 10) open. The starting motor magnetic switch (SMMS1) (line 9) is now de-energized. There is a mechanical block within the KS that prevents returning the KS to the START position without going to the STOP position first. This prevents cranking the engine while the engine is running.With the KS in the RUN position, contacts B and R (line 11 and 13) close to keep the slave relay (SR1) (line 13) energized. SR1 contacts 30 and 87 (line 7) remain closed to energize the fuel solenoid (FS). Fuel is now provided to the engine.The arming delay timer (ADT) (line 15) is also energized when the KS is in the RUN position. The ADT controls the amount of time that the oil pressure shutdown circuit is disabled after engine cranking. The ADT has an adjustable time delay (factory set at 15 seconds) that must elapse before the arming relay (AR) (line 15) is energized. The delay allows time for engine oil pressure to build-up after engine starting. During the delay, the activation of an oil pressure fault is prohibited. The control panel ignores the oil pressure switch (OPS) (line 43) during the delay time. After the time delay elapses, the ADT energizes the arming relay (AR). Contacts 4 and 7 of the AR (line 43) close. The oil pressure relay (OPR) (line 43) and the oil pressure light (OPL) (line 44) can now respond to an OPS contact closure for a low oil pressure shutdown fault. The fault light indicators (OSR, WTR and OPR) can be ON only when key switch is in the RUN position. To reset a fault light, turn key switch to the STOP position.Key Switch