SEAL-PISTON 1407649 - Caterpillar

The manual start/stop panel is used in applications where an operator is present to start and stop the generator set.If an engine fault occurs, the panel will automatically shutdown the engine. At the same time, it will indicate that a fault has occurred through an engine failure light.The manual stop/start panel can be used on engine systems that are either energize to shutoff (ETS) or energize to run (ETR). Energize To Shutoff Engine System
MANUAL START/STOP MODULE 1. Run position.2. Off/Reset position.3. Start position.ECS Engine control switch.EFL Engine failure light.ESPB Emergency stop pushbutton.Engine Start-Up
Engine Control Switch Turned and Held in Start Position
In the Manual Start/Stop control panel, there is a spring return from the start position (3) to the run position (1).When the engine control switch (ECS) (line 8) is turned to the start position (3), it closes the circuit to the starting motor across (ECS) terminals (4 and 3) (line 8). The starting motor magnetic switch (SMMS) (line 9) energizes to close its contact (line 3) and energize the pinion solenoid (PS) (line 3). Solenoid (PS) closes its contact (line 2) to energize the starting motor (SM). When crank termination speed (400 rpm) is reached, electronic speed switch (ESS) crank termination (CT) switch opens across (11 and 12) (line 9) and closes across its contacts (11 and 10) (line 13). (The ECS can be released to the run position once oil pressure is seen on the gauge.)When ESS (CT) opens across (11 and 12), the starting motor circuit is opened and the starting motor shutsdown.At the same time, ESS (CT) closes across (11 and 10) to energize the time delay (TD) (line 13). TD (line 13) then closes across its contacts (6 and 7) (line 36) to arm the shutoff circuit to slave relay (SR1) (line 36). [In an engine shutdown situation, there is a 70 second delay after the engine stops before (TD) opens its contact across (6 and 7) to make sure there is always a complete shutdown.] Also when ESS (CT) closes across (11 and 10), the oil pressure and overspeed fault circuits are armed.In the start and run positions, switch (ECS) is also closed across its terminals (5 and 6) (line 13) to arm the engine failure relay (ENFR) (line 12) circuit. To avoid possible false oil pressure shutdown when the engine is being restarted, the ECS must be held in the START position until oil pressure comes up.Engine Control Switch (ECS) Released To Run Position
When the switch (ECS) is released from the start position (3) to the run position (1), ECS opens across its terminals (3 and 4) (line 8) to de-energize the starting motor circuit.ECS closes across its terminals (9 and 10) (line 15) to arm the oil pressure fault relay (OPR) circuit. Under normal operation, oil pressure switch (OPS1) (line 15) opens across terminals (1 and 3) (line 15) before (ECS) is released from the start to run position. Therefore, preventing a false shutdown.If the optional oil pressure switch (OPS2) (line