Usage:
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
1. Run position.
2. Off/Reset position.
3. Start position.
ECS Engine control switch.
EFL Engine failure light.
ESPB Emergency stop pushbutton.
MANUAL START/STOP MODULE
Engine Start-Up
Engine Control Switch Turned and Held in Start Position
NOTE: 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.
NOTE: 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 17) is supplied then (OPS2) (line 17) must open across terminals (1 and 3) within 9 seconds after the engine reaches the ESS oil pressure step switch (OPSS) speed setting. If OPS2 is not open prior to ESS (OPSS) contacts (13 and 14) (line 17) closing, then the engine will shutdown on a low oil pressure fault.
NOTE: ESS (OPSS) is a switch which starts a 9 second delay (after the engine reaches a set speed) before closing one set and opening another set of contacts. The step speed setting is adjusted according to the rated engine speed. For example, an engine rated at 1800 rpm has its ESS (OPSS) set (adjusted) to 1125 rpm. When the engine accelerates past 1125 rpm, the ESS (OPSS) delays 9 seconds and then opens its contacts across terminals ESS (14 and 15) and closes across terminals ESS (14 and 13).
ECS maintains a closed circuit across its terminals (5 and 6) while in the crank and run position in order to arm the engine failure relay (ENFR) circuit.
Engine Normal Stop
The operator stops the engine by turning the engine control switch (ECS) to the OFF/RESET position from the RUN position.
When turned to OFF/RESET position, ECS (9 and 10) (line 15) opens to prevent the oil pressure relay (OPR) from energizing. Also, ECS (7 and 8) (line 21) closes to allow current to flow through time delay switch (TD) contacts (6 and 7) (line 36) to energize slave relay (SR1). Relay (SR1) in turn closes its contact (line 43) to energize the fuel shutoff solenoid (FSOS) (line 43). This shuts off fuel to the engine.
After the engine shuts down, the electronic speed switch ESS (CT) closes across ESS (CT) (11 and 12) (line 9) to allow for restart. ESS (CT) (11 and 10) (line 13) opens to start a 70 second time delay. After 70 seconds, TD (6 and 7) (line 36) opens to de-energize SR1 and in turn FSOS. The engine can be immediately restarted.
Emergency Stop Pushbotton (ESPB)
The emergency stop pushbotton (ESPB) is a red, mushroom shaped button which is located on both the engine junction box and the generator control panel. Either button will shut the engine down or prevent it from starting when pushed in.
The ESPB on the junction box shuts the engine down as follows:
When pushed in, ESPB creates an open circuit across terminals (1 and 2) (line 9) to open the starting motor circuit.
When pushed in, ESPB creates a closed circuit across terminals (3 and 4) (line 33) to energize both slave relays (SR1) (line 36) and (SR2) (line 33).
Relay (SR2) closes its normally open contact (line 47) to energize the air shut-off solenoid (ASOS). This effectively shuts-off air to the engine. ASOS remains energized until ECS (CT) contacts (10 and 11) (line 17) re-open after the engine stops (air shutoff lever has to be manually reset). ESPB contacts (3 and 4) (line 33) also provide a current path to energize the engine failure relay (ENFR) (line 12) and engine failure light (EFL) (line 13). Relay (ENFR) closes across its contacts (7 and 4) to latch ENFR and EFL.
Relay (SR1) (line 36) is also energized through ESPB (3 and 4). SR1 energizes to close its contact (line 43) and energize the fuel shutoff solenoid which shuts off fuel to the engine.
The ESPB on the generator mounted panel shutsdown the engine as follows:
When pushed in, ESPB creates an open circuit across terminals (1 and 2) (line 8) to open the starting motor circuit.
When pushed in, ESPB closes across terminals (5 and 6) (line 30) to complete a circuit through ESS (CT) (11 and 10) (line 13); through ESPB (5 and 6); through diode (D11) (line 27) to relay (ENFR) (line 12) and light (EFL) (line 13). ENFR energizes to close contacts (7 and 4) (line 13) and (5 and 8) (line 26).
Also through ESPB terminals (5 and 6), a circuit is complete to relays (SR2) and (SR1). Relay (SR2) closes across its contacts (line 47) to energize the air shutoff solenoid (ASOS) which shuts off combustion air to the engine. Relay (SR1) closes across its contacts (line 43) to energize the fuel shutoff solenoid (FSOS) which shuts off fuel to the engine.
Current also flows through engine control switch contacts (5 and 6) (line 13) and through ENFR (7 and 4) (line 13) to latch relay (ENFR) and light (EFL). When the engine shutsdown and ESS (CT) opens across contacts (11 and 10) (line 13), a 70 second time delay occurs before TD opens across (6 and 7) (line 36) to de-energize SR1, and in turn the FSOS.
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To prevent personal injury due to accidental starting of the engine, disconnect the batteries before doing maintenance or repair work. |
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Before starting the engine, do the following:
1. Turn the engine control switch (ECS) to the OFF/RESET position.
2. Correct any faults that may have been the cause of the emergency shutdown.
3. Manually reset the air shut-off lever (at the top of the air inlet housing).
4. Make sure the ESPB has been reset (button out) on both the engine junction box and generator control panel. Turn the button in the direction shown to reset.
5. Turn and hold the ECS in the START position until normal oil pressure is seen on the oil pressure gauge.
Fault Circuit Operation
Low Oil Pressure (OPS1)
Oil pressure is not enough to open oil pressure switch (OPS1) (line 15) [pressure less than 140 kPa (20 psi)]. When engine control switch (ECS) is released to the RUN position from the START position, the contact across ECS terminals (9 and 10) (line 15) completes a closed circuit to oil pressure relay (OPR). Relay (OPR) (line 15) energizes to close its contact across OPR (5 and 8) (line 16) which latches OPR and energizes the engine failure relay (ENFR) (line 12) and failure light (EFL). Relay (ENFR) energizes to close its contact across ENFR (7 and 4) (line 13). The contact across ENFR (7 and 4) latches relay (ENFR).
The contact across ENFR (5 and 8) (line 26) closes to complet the circuit through the 70 second TD switch to the slave relay (SR1) (line 36). Relay (SR1) then energizes to close its normally open contact across SR1 (1 and 3) (line 43) to energize the fuel shutoff solenoid (FSOS) (line 43).
Switch (TD) remains closed across terminals (6 and 7) (line 36) for approximately 70 seconds to make sure the engine shutsdown. The TD can be overrode (to start the engine) by turning the ECS to the OFF/RESET position then to START. This de-energizes (FSOS) (line 43).
| NOTICE |
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To avoid possible engine damage, the engine oil pressure fault must be corrected before restarting. |
As soon as the engine shutsdown, ESS (CT) closes across terminals (11 and 12) (line 9) to allow for re-start of the engine. Also, ESS (CT) opens across terminals (11 and 10) (line 13) to de-energize the OPR and open its contacts across OPR (5 and 8) (line 16).
Engine failure relay (ENFR) (line 12) and engine failure light (EFL) (line 13) remain latched through ENFR contacts (5 and 8) (line 26) until ECS is turned to the OFF/RESET position. However, with ECS in the OFF/RESET position, ECS contacts (7 and 8) (line 21) maintains the circuit through TD to SR1 (line 36) to keep FSOS (line 43) energized for the duration of the 70 second time delay.
Low Oil Step Pressure (OPS2)
Oil pressure is enough to close (OPS1) (line 15), but not enough to close the oil pressure switch (OPS2) (line 17) in the 9 second time delay before ESS (OPSS) (line 17) closes.
NOTE: The 9 second time delay of ESS (OPSS) does not begin until the speed step setting is reached.
After the 9 second delay, switch ESS (OPSS) closes across its terminals (14 and 13) (line 17). The circuit is now complete through switch (OPS2) (line 17) and across ECS terminals (9 and 10) (line 15) to energize the oil pressure fault relay (OPR) (line 15). Relay (OPR) energizes to close its contact across OPR (5 and 8) (line 16) which latches OPR and energizes the engine failure relay (ENFR) (line 12) and failure light (EFL) (line 13). Relay (ENFR) energizes to close its contact across ENFR (7 and 4) (line 13). The contact across ENFR (7 and 4) latches in relay (ENFR). The contact across ENFR (5 and 8) (line 26) closes to complete the circuit through the 70 second (TD) switch to the slave relay (SR1). Relay (SR1) then energizes to close its normally open contact to energize the fuel shutoff solenoid (FSOS) (line 43).
Switch (TD) remains closed across terminals (6 and 7) (line 36) for approximately 70 seconds to make sure the engine shutsdown. The TD can be overrode (to start the engine) by turning the ECS to the OFF/RESET position then to START. This de-energizes (FSOS) (line 43).
| NOTICE |
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To avoid possible engine damage, the engine oil pressure fault must be corrected before restarting. |
As soon as the engine shutsdown, ESS (CT) closes across terminals (11 and 12) (line 9) to allow for restart of the engine. Also, ESS (CT) opens across terminals (11 and 10) (line 13) to de-energize the OPR and open its contacts across OPR (5 and 8) (line 16).
Engine failure relay (ENFR) (line 12) and engine failure light (EFL) (line 13) remain latched through ENFR contacts (5 and 8) (line 26) until ECS is turned to the OFF/RESET position. However, with ECS in the OFF/RESET position, ECS contacts (7 and 8) (line 21) maintains the circuit through TD to SR1 (line 36) to keep FSOS (line 43) energized for the duration of the 70 second time delay.
Water Temperature Fault (WTS)
When engine coolant temperature becomes too high, the normally open water temperature switch (WTS) (line 18) closes. This completes a circuit to relay (ENFR) (line 12) and to the engine failure light (EFL) (line 13). Relay (ENFR) energizes to close its contact across ENFR (7 and 4) (line 13). This latches relay (ENFR). The contact across ENFR (5 and 8) (line 26) closes to complete the circuit through the 70 second (TD) switch to the slave relay (SR1). Relay (SR1) then energizes to close its normally open contact to energize the fuel shutoff solenoid (FSOS) (line 43).
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To avoid personal injury, turn ECS to OFF/RESET before repairing engine fault. |
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When the engine control switch (ECS) is turned to the OFF/RESET position, the relay (ENFR) (line 12) de-energizes to open its contacts (7 and 4) (line 13) to unlatch ENFR and the engine failure light (EFL) (only if engine has cooled sufficiently to allow WTS to reset). It also opens across the contacts (5 and 8) (line 26) to open the ENFR circuit to the time delay switch (TD) (line 36) and slave relay (SR1). However, with ECS in the OFF/RESET position, ECS contacts (7 and 8) are closed to keep SR1 energized and in turn the FSOS. When TD times out, TD opens across contacts (6 and 7) to de-energize SR1. The FSOS then de-energizes to allow engine restart (if WTS has reset).
Overspeed Fault [ESS OS)]
When engine speed increases above the overspeed setting (118% of rated speed) of the electronic speed switch (ESS), the overspeed switch ESS (OS) will close across its terminals (8 and 7) (line 29). This completes a circuit through relay (SR2) (line 33) which closes its normally open contact (line 47) to energize the air shut-off solenoid (ASOS) (line 47). Current also flows through diode (D2) (line 35) to energize relay (SR1) (line 36) which closes its normally open contact (line 43) to energize the fuel shut-off solenoid (FSOS) (line 43). Current also flows through diode (D11) to relay (ENFR) (line 12) and failure light (EFL) (line 13). Relay (ENFR) energizes to close its contact across ENFR (7 and 4) (line 13). This latches relay (ENFR). The contact across ENFR (5 and 8) (line 26) also closes to complete a circuit through the 70 second (TD) switch to relay (SR1).
When the engine shutsdown, ESS (CT) contacts across (11 and 12) (line 9) close for restart. ESS (CT) (11 and 10) (line 13) opens to start a 70 second time delay and de-energize SR2. Current flows through engine-generator terminal point 4 (line 22) through ENFR contacts (5 and 8) (line 26) to keep SR1 and in turn FSOS energized (until the 70 second time delay has elapsed).
When ECS is turned to OFF/RESET from the RUN position (after the engine is shutdown), ECS (5 and 6) (line 13) opens to de-energize ENFR which in turn opens its contacts ENFR (7 and 4) (line 13) to unlatch ENFR (line 12) and EFL (line 13). Relay (ENFR) also opens across contact (5 and 8) (line 26). However, ECS contacts across (7 and 8) (line 21) keeps SR1 and FSOS energized until either TD times out or ECS is turned to the START or RUN positions.
| NOTICE |
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To avoid engine damage, repair or correct the engine problem before restart. |
Before restarting, the ESS (OS) must be manually reset at the engine junction box to avoid shutdown at start-up.
Also, the air shutoff lever must be manually reset (at the top of the air inlet housing).
Energize To Run Engine System
1. Run position.
2. Off/Reset position.
3. Start position.
ECS Engine control switch.
EFL Engine failure light.
ESPB Emergency stop pushbutton.
MANUAL START/STOP MODULE
Engine Start-Up
Engine Control Switch Turned and Held in Start Position
NOTE: In the Manual Start/Stop control panel, there is a spring return from start position (3) to run position (1).
In the START position, the engine control switch (ECS) closes across ECS (3 and 4) (line 8). The starting motor circuit is then energized through electronic start switch-crank termination [ESS (CT)] terminals (11 and 12) (line 17); through emergency stop pushbutton (ESPB) (engine mounted) contacts (1 and 2) (line 9); through ECS contacts (3 and 4) (line 8); through ESPB (panel mounted) contacts (1 and 2) (line 8) to starting motor magnetic switch (SMMS) (line 9). Switch (SMMS) energizes to close its contact (line 3) and energizes the pinion solenoid (PS) (line 3). Solenoid (PS) closes its contact (line 2) to energize the starting motor (SM) (line 2).
In the START position, ECS also closes across contacts (5 and 6) (line 13) to arm the engine failure relay (ENFR) circuit.
In the START position, ECS also closes across contacts (1 and 2) (line 23) and (11 and 12) (line 24). The fuel solenoid circuit is energized starting at ESS (CT) (11 and 12) (line 17); through diode (D3); through ESPB (engine mounted junction box) contacts (1 and 2); through water temperature switch (WTS) contact (line 18); through engine failure relay (ENFR) contact (2 and 8) (line 23) and through ECS contacts (1 and 2) (line 23) to ESPB (panel mounted) contacts (8 and 7). At this point, current initially flows through ECS contacts (11 and 12) to slave relay (SR1) (line 36). Relay (SR1) then closes its contacts (1 and 3) (line 43) to energize the fuel solenoid (FS) (line 43). This allows fuel for engine combustion.
As soon as engine low idle oil pressure comes up (check oil pressure gauge), current also flows in a parallel path from ESPB contacts (7 and 8) (line 23) through oil pressure switch (OPS1) contacts (1 and 2) (line 13) and through ESS oil pressure step switch (OPSS) contacts (14 and 15) (line 13) to SR1 (which should be already energized).
When the engine reaches approximately 400 rpm, ESS (CT) closes across contacts (11 and 10) (line 17). Besides opening the starting circuit, current now flows through the ESS overspeed switch (OS) contacts (8 and 9) (line 29); through ESPB contacts (1 and 2) and on through the paths described above. Also, through ESS (CT) contacts (11 and 10), the oil pressure relay (OPR) circuit is armed.
ECS Released to Run Position
When ECS switch is released from the START position to the RUN position, ECS contacts across (3 and 4) (line 8) open to de-arm the starting motor circuit.
In the RUN position, ECS remains closed across contacts (1 and 2) (line 23) to maintain the relay (SR1) (line 36) energized and in turn the fuel solenoid (FS) (line 43) as described in the above section, ECS Turned And Held In Start Position.
NOTE: The electronic speed switch-oil pressure step switch ESS (OPSS) (line 13) is a switch which starts a 9 second delay [after reaching a step (set) speed while accelerating to rated engine speed] before closing one set and opening another set of contacts. The step speed setting is adjusted according to the rated engine speed. For example, an engine rated at 1800 rpm has its ESS (OPSS) set (adjusted) to 1125 rpm. When the engine accelerates past 1125 rpm, the ESS (OPSS) starts a 9 second delay before it opens across terminals ESS (14 and 15) and closes across terminals ESS (14 and 13).
Once the engine speed reaches the ESS (OPSS) step speed, ES (OPSS) will delay 9 seconds before closing across contacts (14 and 13) and opening across (14 and 15). Current then flows through a jumper or across an optional high idle oil pressure switch (OPS2) (line 13) to maintain SR1 (line 36) energized and in turn the fuel solenoid (FS) (line 43).
In the RUN position, ECS contacts (11 and 12) open to remove this parallel circuit to SR1, used during START.
In the RUN position, ECS contacts (9 and 10) close to arm the oil pressure fault relay (OPR) circuit. If OPS2 fails to close across its contacts (1 and 2) (line 13) within 9 seconds after the step speed setting is passed and/or OPS1 fails to close before the ECS is released from START to RUN, then OPR (line 15) will energize to initiate engine shutdown. (Make reference to the following fault sections for further information).
Engine Normal Stop
The operator stops the engine by turning the engine control switch (ECS) to the OFF/RESET position from the RUN position.
When turned to OFF/RESET from the RUN position, ECS contacts across (1 and 2) (line 23) open to stop the flow of current through ESPB (8 and 7); through OPS1 (1 and 2); through ESS (OPSS) (14 and 13) and through OPS2 (1 and 2) to relay SR1 which de-energizes. When SR1 de-energizes, it opens its contact (1 and 3) to de-energize the fuel solenoid (FS) which shuts off fuel to the engine.
After the engine shuts down, the switch ESS (CT) opens across (11 and 10) and closes across (11 and 12) (line 17) to allow for restart.
Emergency Stop Pushbutton (ESPB)
The emergency stop pushbutton (ESPB) is a red, mushroom shaped button located on both the engine junction box and the generator control panel. Either button will shut the engine down or prevent it from starting when pushed in.
The ESPB on the engine junction box shuts the engine down as follows:
When pushed in, ESPB opens across terminals (1 and 2) (line 9) to open the starting motor circuit. ESPB also opens across terminals (1 and 2) (line 18) to open the circuit from ESS (CT) (11 and 10) (line 17) through ESS (OS) (8 and 9) (line 29); WTS (line 18); ENFR (2 and 8) (line 23); ECS (1 and 2) (line 23); ESPB (panel mounted) contacts (8 and 7); OPS1 (1 and 2) (line 13); ESS (OPSS) (14 and 13) and through OPS2 (1 and 2) to relay (SR1). SR1 then de-energizes to open its contacts and de-energize the fuel solenoid (FS) (line 43). This shuts off the fuel to the engine.
When pushed in, ESPB closes across terminals (3 and 4) (line 33) to close the circuit from ESS (CT) (11 and 10) (line 17) to slave relay (SR2). Relay (SR2) energizes to close its contacts (1 and 3) (line 47) to energize the air shutoff solenoid (ASOS) (line 47). ASOS shuts off air for combustion. At the same time, the circuit is completed from SR2 through diode (D11) (line 28) to the engine failure relay (ENFR) (line 12) and engine failure light (EFL) (line 13). ENFR closes across its contacts (7 and 4) (line 13) to complete a circuit through ECS contacts (5 and 6) (line 13) to latch ENFR and the light (EFL).
The ESPB on the generator mounted panel (when pushed in) shuts down the engine as follows:
When pushed in, ESPB opens across its terminals (1 and 2) (line 8) to open the starting motor circuit.
When pushed in, ESPB opens across its terminals (8 and 7) to open the circuit (as described in engine mounted ESPB) to SR1 (line 36). SR1 de-energizes to open its contacts (1 and 3) (line 43) and de-energize the fuel solenoid (FS) (line 43).
When pushed in, ESPB closes across (5 and 6) (line 30) to complete a circuit from ESS (CT) (11 and 10) (line 17) to SR2 (line 33). SR2 energizes to close its contacts (1 and 3) (line 47) and energize ASOS (line 47). This shuts off combustion air to the engine. With contacts ESPB (5 and 6) closed, current also flows through diode (D11) (line 28) to the engine failure relay (ENFR) (line 12) and engine failure light (EFL) (line 13). ENFR closes across its contacts (7 and 4) (line 13) to complete a circuit through ECS contacts (5 and 6) (line 13) to latch ENFR and EFL.
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To prevent personal injury due to accidental starting of the engine, disconnect the batteries before doing maintenance or repair work. |
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Before starting the engine, do the following:
1. Turn th engine control switch (ECS) to the OFF/RESET position.
2. Correct any faults that may have been the cause of the emergency shutdown.
3. Manually reset the air shut-off lever (at the top of the air inlet housing).
4. Make sure the ESPB has been reset (button out) on both the engine junction box and generator control panel. Turn the button in the direction shown to reset.
5. Turn and hold the ECS in the START position until normal oil pressure is seen on the oil pressure gauge.
Fault Circuit Operation
Low Oil Pressure (OPS1)
For normal operation, make reference to the section, ENGINE START-UP.
Depending on engine speed during start-up, the electronic speed switch (ESS) - crank termination (CT) will be:
closed across contacts (11 and 12), providing a current path through diode (D3) to emergency stop pushbutton (ESPB) terminals (1 and 2) (line 18) (if engine speed is less than 400 rpm).
closed across contacts (11 and 10) providing a current path through ESS-overspeed switch (OS) contacts (8 and 9) to ESPB terminals (1 and 2) (line 18) (if engine speed is equal to or greater than 400 rpm).
Regardless of initial oil pressure and engine speed (as long as engine control switch (ECS) is held in the START position) the engine will start and run. From ESPB terminals (1 and 2) (line 18), current flows through the water temperature switch (WTS) (line 18) through normally closed (N.C.) engine failure relay (ENFR) contacts (2 and 8) (line 23) through ECS contacts (1 and 2) through ESPB (panel mounted) terminals (1 and 2) (line 23) through ECS contacts (12 and 11) (line 24) to slave relay (SR1) (line 36). Relay (SR1) energizes to close its contacts (1 and 3) (line 43) and energize the fuel solenoid (FS) (line 43). This provides fuel to the engine.
If at this point the ECS is released from the START to RUN position and there is not enough initial oil pressure to close oil pressure switch (OPS1) across contacts (1 and 2) (line 13), then the opening across ECS contacts (11 and 12) will de-energize SR1 and FS. This shuts off fuel to the engine, resulting in engine shutdown.
With OPS1 closed across its contacts (1 and 3), the current path will be also through ECS contacts (9 and 10) (line 15) to oil pressure relay (OPR). Relay (OPR) energizes to close its contact (5 and 8) (line 16). If ESS (CT) has closed across its contacts (11 and 10) to arm the circuit to OPR contacts (5 and 8) through diode (D13) (line 17) to engine failure relay (ENFR) (line 12) and engine failur light (EFL) (line 13). Relay (ENFR) energizes to close its contacts (7 and 4) (line 13) which latches ENFR and EFL through ECS contacts (5 and 6).
When the ECS is turned to the OFF/RESET position from the RUN position, the relay (ENFR) and light (EFL) de-energize to allow restart.
Low Oil Pressure (OPS2) (Optional)
For normal operation, make reference to the section, ENGINE START-UP.
Once the engine is started and ECS has been released from the START to the RUN position, initial oil pressure is enough to close oil pressure switch (OPS1) across its contacts (1 and 2) (line 13). This maintains slave relay (SR1) (line 36) energized through electronic speed switch (ESS) oil pressure step switch (OPSS) contacts (14 and 15) (line 13). However, as engine speed increases past the oil pressure step switch setting, ESS (OPSS) initiates a 9 second delay before closing across contacts (14 and 13) and opening across (14 and 15) (line 13).
At the end of the 9 second delay, ESS (OPSS) closes across contacts (14 and 13) to complete the circuit to oil pressure switch (OPS2) and opens across ESS (OPSS) (14 and 15) to stop current flow to (SR1). If at this point, the oil pressure is not at least 240 kPa (40 psi), OPS2 remains closed across contacts (1 and 3) (line 13) to stop current flow to SR1. Relay (SR1) then de-energizes to open across contacts (1 and 3) (line 43) and de-energize the fuel solenoid (FS). This shuts off fuel to the engine and in turn the engine shuts down.
At the same time, current flows through OPS2 contacts (1 and 3) and ECS contacts (9 and 10) (line 15) to oil pressure relay (OPR). Relay (OPR) energizes to close its contact (5 and 8) (line 16) and latch OPR; also current flows through diode (D13) (line 17) to engine failure relay (ENFR) (line 12) and engine failure light (EFL) (line 13). Relay (ENFR) energizes to close its contacts (7 and 4) (line 13) which latches ENFR and EFL through ECS contacts (5 and 6).
When the ECS is turned to the OFF/RESET position from the RUN position, the relay (ENFR) and light (EFL) de-energize to allow restart.
Water Temperature Fault (WTS)
When engine coolant temperature becomes too high, the normally open water temperature switch (WTS) opens across its normally closed (N.C.) contact (line 18). This opens the circuit to slave relay (SR1) (line 36). Relay (SR1) de-energizes to open its contacts (1 and 3) and de-energize the fuel solenoid (FS). This shuts off fuel to engine which in turn shuts down.
Also, WTS closes across its normally open (N.O.) contact (line 18) to energize the engine failure relay (ENFR) (line 12) and engine failure light (EFL) (line 13). Relay (ENFR) energizes to close its contact (7 and 4) (line 13) which latches ENFR and EFL through ECS contacts (5 and 6).
Turn the ECS to the OFF/RESET position from the RUN position. Relay (ENFR) and light (EFL) will de-energize to allow restart after the engine cools down and the fault has been corrected.
Overspeed Fault - ESS (OS)
For normal operation, make reference to the section, ENGINE START-UP.
When engine speed increases above the overspeed setting (118% of rated speed) of the electronic speed switch (ESS), the overspeed switch ESS (OS) will close across contacts (8 and 7) and open across contacts (8 and 9) (line 29).
When ESS (OS) opens across contacts (8 and 9), this opens the circuit to slave relay (SR1) (line 36). Relay (SR1) de-energizes to open its contacts (1 and 3) (line 43) to de-energize the fuel solenoid (FS). This shuts off fuel to the engine which in turn shuts down the engine.
At the same time, ESS (OS) closes across terminals (8 and 7) which energizes slave relay (SR2) (line 33). Relay (SR2) in turn closes its contact (line 47) to energize the air shutoff solenoid (ASOS) (line 47). Solenoid (ASOS) shuts off air for combustion. Also, current flows through diode (D11) (line 28) to engine failure relay (ENFR) (line 12) and engine failure light (EFL) (line 13). Relay (ENFR) energizes to close its contact (7 and 4) (line 13) which latches ENFR and EFL through ECS contacts (5 and 6).
Turn the ECS to the OFF/RESET position from the RUN position. Relay (ENFR) and light (EFL) will de-energize to allow restart after the following:
1. overspeed fault has been corrected.
2. the air shut-off lever has been manually reset (at the top of the air inlet housing).
3. manually reset the overspeed button on the ESS module.
ELECTRONIC GOVERNOR GROUP (With and Without Pre-regulator)
AUXILIARY RELAY MODULE GROUP
