Electric Protection System Energize-To-Run For Generator Set, Industrial and Marine Diesel Engines Caterpillar

Troubleshooting the ETR Partial Protection System (OP, WT)

Usage:

3304 10E

Problem 1

The engine cranks but the engine does not start.

Check the engine fuel system.
1. Crank the engine.
2. Observe the action of the fuel rack, the governor, and the air inlet valve.
3. If a 2301A Electric Governor is installed, measure the voltage that is supplied to the governor.
  Result
  - The fuel rack and the governor move in the FUEL ON direction.
  The problem is in the engine or in the fuel system. Refer to the engine Service Manual. STOP.
  - The fuel rack does not move. The governor does not move in the FUEL ON direction.
  The start/stop switch is not in the START position. Go to Step 2.
  - A 2301A Electric Governor is installed and the supply voltage is greater than 15 volts.
  The problem is in the governor or the actuator system. Refer to the 2301A Electric Governor Service Manual, SENR3585. STOP.
  - A 2301A Electric Governor is installed and the supply voltage is less than 15 volts.
  The problem is in the wiring to the 2301A Electric Governor. Go to Step 3.
Check the slave relay (SR1) and the fuel solenoid.
1. Connect a jumper with a 20 amp capacity between terminals (TS-11) and (TS-30) of the junction box.
2. Reset the circuit breaker (CB7).
3. Crank the engine. Stop the engine with the emergency stop switch if trouble occurs.
4. Measure the voltage at terminal (TS-11).
5. Remove the jumper when the test is completed.
  Result
  - The engine starts and the engine runs.
  The slave relay (SR1) is not energizing the shutoff solenoid. Go to Step 3.
  - The engine does not start.
  The shutoff solenoid is stuck or the fuel rack is stuck in the shutoff position. Find the source of the problem and correct the source of the problem. STOP.
  - The engine does not start. The voltage at terminal (TS-11) is zero.
  The circuit breaker (CB7) is open. Reset the circuit breaker or replace the circuit breaker.
Check the slave relay (SR1).
1. Connect a jumper between terminals (TS-12) and (TS-24) of the junction box.
2. Reset the circuit breaker (CB5).
3. Crank the engine. Stop the engine with the emergency stop switch, if trouble occurs.
4. Measure the voltage at terminal (TS-24).
5. Remove the jumper when the test is completed.
  Result
  - The engine starts and the engine runs.
  The (SR1) is not faulty. Go to Step 4.
  - The engine does not start.
  Contacts (SR1-30) and (SR1-87) of (SR1) that are normally open have been shorted and the fuel shutoff solenoid is energized. If a 2301A Electric Governor is installed, contacts (SR-30) and (SR-87a) of (SR1) that are normally closed are open or the wiring to the 2301A Electric Governor is faulty. Replace the (SR1) or repair the wiring problem. Refer to Testing and Adjusting, "Slave Relay Test". Reconnect the wire at the terminal of the time delay relay (TD-7). STOP.
  - The engine does not start. The voltage at terminal (TS-24) is zero.
  The circuit breaker (CB5) is open. Reset the circuit breaker or replace the circuit breaker. If the circuit breaker is tripped, the (SR1) is shorted. Repair the (SR1) or repair the wiring. STOP.
Check the slave relay (SR2), the start/stop switch, and the water temperature contactor switch (WTS).
1. Connect a jumper between terminals (TS-2) and (TS-3) of the junction box.
2. Ensure that the emergency stop switch (ES) is reset.
3. Ensure that the start/stop switch is in the RUN position.
4. If a remote normal start/stop switch (RNSS) is not installed, ensure that there are jumpers between the terminals. There are two jumpers. One jumper is between terminals (TS-3) and (TS-4). The second jumper is between terminals (TS-4) and (TS-5).
5. Crank the engine.
6. Remove the jumpers when the test is completed.
  Result
  - The engine starts and the engine runs.
  The problem is in the WTS. STOP.
  - The engine does not start.
  Check the slave relay (SR2). Refer to Testing and Adjusting, "Slave Relay Test". Replace the faulty relay. If the relay is not faulty, go to Step 5.
Check the start/stop switch and the emergency stop switch (ES).
1. Measure the voltage at terminal (SR2-30) or at terminal (SSS-4), before you crank the engine and while you crank the engine.
  Result
  - The voltage at terminal (SR2-30) is 15 volts or more before you crank the engine.
  The start/stop switch is not opening when the switch is in the STOP position. The (SR2) is not resetting. Replace the start/stop switch. Ensure that the start/stop switch is in the STOP position before you crank the engine. STOP.
  - The voltage at terminal (SR2-30) is zero before you crank the engine, and the voltage is 10 volts or more while you crank the engine.
  Go to Step 6.
  - The voltage at terminal (SR2-30) is zero before you crank the engine and while you crank the engine.
  Go to Step 7. The ES or the start/stop switch is not closing.
Check the slave relay (SR2) and the oil pressure switch (OPS1).
1. Connect a jumper between terminals (TS-24) of the junction box and terminal (SR2-30) of the slave relay.
2. Measure the voltage at terminals (TS-6), (TS-9), and (TS-12) of the junction box.
3. Remove the jumper after the test is completed.
  Result
  - The voltage at terminal (TS-9) is 15 volts or more.
  (OPS1) is shorted or the wiring is not correct.
  - The voltage at terminal (TS-9) is 15 volts or more and the voltage at terminal (TS-12) is zero volts.
  (OPS1) is shorted and the diode (D2) is open. Refer to Testing and Adjusting, "Diode Test".
  - The voltage at terminal (TS-6) is 15 volts or more and the voltage at terminal (TS-9) is zero volts.
  Contacts (SR2-30) and (SR2-87) are shorted or the (SR2) is not resetting. Go to Step 5. Replace the slave relay. Refer to Testing and Adjusting, "Slave Relay Test".
  - None of the above situations exist.
  Replace the diode (D2) and crank the engine again.
Check the emergency stop switch (ES) and the start/stop switch.
1. Connect a jumper between terminals (ES-1) and (ES-2) of the ES. The jumper can also be connected between terminals (SSS-4) and (SSS-5) of the start/stop switch or between terminals (TS-4) and (TS-5) of the junction box if a remote normal start/stop switch (RNSS) is installed. Connect the terminals one at a time.
2. Measure the voltage at terminal (SR2-30) of the slave relay (SR2) while you crank the engine. Measure the voltage for each switch.
  Result
  - The voltage is 10 volts or more while the engine is cranking.
  The corresponding switch is not closing and the switch should be replaced. STOP.

Problem 2

The engine does not crank.

Check the engine mounted start switch (EMSS).
1. Ensure that the emergency stop switch (ES) has been reset.
2. Place a switch across the terminals of the EMSS.
3. Close the switch momentarily, but do not start the engine.
4. Remove the switch when the test is completed.
  Result
  - The engine cranks.
  The EMSS is faulty or the circuit breaker (CB2) must be reset.
  - The engine does not crank.
  Go to Step 3.
Check the start/stop switch.
1. Ensure that the emergency stop switch (ES) has been reset.
2. Connect a switch with a 2 amp capacity between terminals (TS-21) and (TS-26) of the junction box.
3. Close the switch momentarily, but do not start the engine.
4. Disconnect the switch after the test is completed.
  Results
  - The engine cranks.
  The start/stop switch is faulty or the wiring to the switch is faulty. Replace the switch or repair the wiring. The circuit breaker (CB2) may need to be reset.
  - The engine does not crank.
  Go to Step 3.
Check the emergency stop switch (ES).
1. Ensure that the emergency stop switch (ES) has been reset.
2. Connect a switch with a 2 amp capacity between terminals (TS-26) and (TS-24) of the junction box.
3. Close the switch momentarily but do not start the engine.
4. Disconnect the switch after the test is completed.
  Result
  - The engine cranks.
  The emergency stop switch (ES) is faulty.
  - The engine does not crank.
  Reset the circuit breaker (CB5) and repeat Step 3. If the engine does not crank go to Step 4.
Check the components of the starting system.
1. Check the voltage at terminal (TS-24) of the junction box.
  Result
  - The voltage is low. Low voltage is between 1 volt and 20 volts.
  Charge the battery or repair the loose connections between the battery cable terminal and the battery. STOP.
  - The voltage is above 20 volts.
  The magnetic switch (MS), the pinion solenoid (PS), or the starting motor (SM) is faulty. The circuit breaker (CB2) may need to be reset. Reset the circuit breaker and repair the component that is faulty.
  - The voltage is zero (less than 1 volt).
  The circuit breaker (CB5) is being overloaded or the circuit breaker is faulty. Repair the short circuit or replace the circuit breaker. STOP.

Problem 3

The engine starts and shutdown occurs immediately, or engine cranking terminates.

Check the protection switches.
1. Measure the voltage at terminal (SR2-30) while you crank the engine.
  Result
  - The voltage is above 10 volts while you crank the engine. The voltage then decreases to zero when the engine shuts down.
  The emergency stop switch (ES), the water temperature contactor switch (WTS), and the start/stop switch are opening. Check the start/stop switch first. The switch may be open across the common pair of contacts for the START/RUN switch when the switch is in the START position. The switch may also be open when the switch is released from the START position. Go to Step 7 of "Problem 1".
  - The voltage is above 10 volts at all times.
  The diode (D2) is faulty or there is a short across the diode circuit. The engine oil pressure switch (OPS1) may also have an intermittent short in the switch or in the connection. Refer to Testing and Adjusting, "Diode Test". Also refer to Testing and Adjusting, "Engine Oil Pressure Switch Test". Replace the faulty components and check for any faulty wiring. STOP.

Problem 4

The starting motor remains engaged or the starting motor continues to run after the engine is running.

Check the components of the starting circuit.
1. Measure the voltages at terminal (TS-26) of the junction box while the engine is running.
  Result
  - The voltage at the terminal is zero volts.
  The problem is in the starting motor (SM), the pinion solenoid (PS), or the magnetic switch (MS). Repair the faulty component. STOP.
  - The voltage at the terminal is between 15 volts and 32 volts.
  The START terminals of the start/stop switch are normally closed. This is normal for an automatic start system. In a manual start system, the switches should be normally open. The switch is on terminals (SSS-1) and (SSS-2) for a normal start/stop switch. Repair the faulty switch.

Problem 5

The engine shutdown occurs after the engine runs for more than 3 minutes.

Check the emergency stop switch (ES), the start/stop switch (SSS), the remote normal start/stop switch (RNSS), and the water temperature contactor switch (WTS).
1. Connect a jumper between terminal (TS-24) of the junction box and terminal (SR2-30) of the slave relay.
2. Remove the jumper when the test is completed.
  Result
  - The engine starts and the engine runs.
  The ES, the WTS, the RNSS, or the SSS is opening. Refer to Step 7 of "Problem 1".
  - The engine starts and the engine shuts down after 3 minutes.
  Go to Step 2.
Check the engine oil pressure switch (OPS1) and the slave relay (SR2).
1. Connect a jumper between terminal (TS-12) of the junction box and terminal (SR2-30) of the slave relay.
2. Ensure that the engine oil pressure is increasing while the engine is cranking.
3. Remove the jumper when the test is completed.
  Result
  - The engine starts and the engine runs.
  The problem is in (OPS1), (SR2), or the wiring of the switches. Refer to Testing and Adjusting, "Engine Oil Pressure Switch Test" and Testing and Adjusting, "Slave Relay Test". Repair the faulty wiring or replace the faulty switches. STOP.
  - The engine starts and the engine shuts down after 3 minutes.
  The slave relay (SR1) may be faulty. Refer to Testing and Adjusting, "Slave Relay Test". The fuel supply or the 2301A Electric Governor may also be faulty, if equipped. Refer to 2301A Electric Governor Service Manual, SENR3585. STOP.

Problem 6

Engine shutdown does not occur when a fault is detected.

Check the engine oil pressure switch (OPS1) and the water temperature contactor switch (WTS).
1. Disconnect the wire that is between terminals (TS-12) and (SR1-4). Insulate the end of the wire.
2. Reconnect the wire to terminal (TS-12) when the test is completed.
  Result
  - The engine starts and the engine runs.
  Go to Step 2.
  - The engine cranks but the engine will not start.
  Go to Step 2.
Check the protection switches and the crank terminate switch of the electronic speed switch.
1. Reset circuit breaker (CB7).
2. Start the engine and run the engine at low idle.
  Note: Disconnect one switch at a time in order to simulate a fault.
3. Disconnect the oil pressure switch (OPS1).
4. Disconnect the water temperature contactor switch (WTS).
  Result
  - Engine shutdown occurs at low idle.
  The engine protection system is operating correctly. Refer to Testing and Adjusting, "Engine Oil Pressure Switch Test" or Testing and Adjusting, "Water Temperature Contactor Switch Test". Replace the faulty switch. If the switches are not faulty, the circuit breaker (CB7) may have tripped. Inspect the circuit for a short circuit to ground. STOP.
  - Engine shutdown does not occur at low idle.
  The jumpers that are between terminals (TS-9) and (TS-10) have not been connected. The jumpers that are between terminals (TS-8) and (TS-9) have not been connected. The jumpers that are between terminals (TS-7) and (TS-8) have not been connected. Install all of the jumpers. Refer to Testing and Adjusting, "Diode Test". Replace a faulty diode.