Emergency Stop Switch Circuit - Test
- Test
SMCS Code:
SMCS Code: 7332-038 System Operat
System Operation Description:ion Description:
This application is equipped with an emergency stop switch. The sw itch is located on the control panel.
The Electronic Control Module (ECM) is con figured to record an event when the switch is activated.
The emergency stop switch provides a switch in the circuit from the +Battery to the control input for the ECM relay. The ECM relay provides the battery power for the ECM.
The emergency stop switch is a normally open switch in the RUN position. The secondary contacts for the ECM relay are normally closed contacts.
When the emergency stop switch is switched to the STOP position, the switch contacts for the emergency stop switch are closed. Control input voltage is supplied to the ECM relay and secondary contacts of the ECM relay are pulled open. This removes battery voltage fro m the ECM.
g01206694 Illustration 55
Schematic for the emergency stop switch
Test Step 1. Inspect the Electrical Test Step 1. Inspect the Electrical Connectors and the Wiring Connectors and the Wiring
A.A. Turn the battery disconnect switch to the OFF position.
128 RENR9348-01 Troubleshooting Section
g01207034 Illustration 56
Location of the ECM relay (typical left side engine view)
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Location of the engine interface connector (typical engine view)
B.
B. Thoroughly inspec t the connector for relay (1) and connector (2). Also, thoroughly inspect any other connectors that are associated with the circuit.
Refer to Troubleshooting, “Electrical Connectors -Inspect” for details.
g01206959 Illustration 58
Terminal locations at the engine interface connector that are associated with the emergency stop switch
(4) +Battery (23) Emergency stop
g01206963 Illustration 59
Terminal locations at the connector for the emergency stop switch (5) +Battery
(11) Emergency stop
g01210818 Illustration 60
Terminal locations at the ECM relay that are associated with the emergency stop switch
(5) Emergency stop
C.
C. Perform a 45 N (10 lb) pull test on each of the wires in the circuit for the emergency stop switch.
D.
D. Check the torque of the allen head screws for the engine interface connector. Refer to Troubleshooting, “Electrical Connectors - Inspect”
for the correct torque values.
E.
E. Check the harnes s and the wiring for abrasion and for pinch points from the battery to the ECM relay.
Expecte Expected d Result:Result:
All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion, and of pinch points.
Results:
Results:
•
OK – The connectors and wiring appear to be OK.Proceed to Test Step 2.
RENR9348-01 129 Troubleshooting Section
•
Not OK – The connectors and/or wiring are not OK.Repair:
Repair: Repair the wiring and/or the connectors.
Replace parts, if necessary.
STOP.
Test Step 2. Check for Voltage at the Test Step 2. Check for Voltage at the Connector for the Emergency Stop Connector for the Emergency Stop Switch
Switch
A.A. Disconnect t he connectors for the emergency stop switch.
B.
B. Turn the batt ery disconnect switch to the ON position.
C.
C. Measure the voltage between terminal 5 on the harness side of the connector for the emergency stop switch and the engine ground stud.
D.
D. Turn the battery disconnect switch to the OFF position. emergency stop switch. There may be a problem with the emergency stop switch. Proceed to Test Step 4.
•
Not OK – The vol tage is not 24 ± 3 VDC. The supply voltage is not reaching the connector for the emergency stop switch. There is a problem in the circuit between the emergency stop switch and the battery. Proceed to Test Step 3.Test Step 3. Check the Emergency Stop Test Step 3. Check the Emergency Stop Switches
Switches
A.A. Disconnect the engine interface connectors.
B.
B. Turn the battery disconnect switch to the ON position.
C.
C. Measure the voltage between terminal 4 on the engine harness side of the engine interface connectors and the engine ground stud.
D.
D. Turn the battery disconnect switch to the OFF position.
Expecte Expected Result:d Result:
The correct voltage is 24 ± 3 VDC.
Results:
Results:
•
OK – The voltage is 24 ± 3 VDC.Repair:
Repair: There i s supply voltage at the engine interface connectors, but not at the connector for the emergency stop switch.
There is a problem in the harness between the engine interface connectors and the connector for the emerge ncy stop switch. The problem may be in a connector. Repair the harness and/or the connector. Replace parts, if necessary.
Refer to Trou bleshooting, “Inspecting Electrical Connectors”.
STOP.
•
Not OK – The voltage is not 24 ± 3 VDC . Repair:Repair: Supply voltage is not reaching the engine interface connector. There is a problem in the circuit fro m the battery to the engine interface connector. Ensure that the circuit breaker for the emergency stop switch is not tripped. Repair the harness and/or the connector. Replace parts, if necessary.
Refer to Tro ubleshooting, “Inspecting Electrical Connectors”.
STOP.
Test Step 4. Check the Emergency Stop Test Step 4. Check the Emergency Stop Switch
Switch
A.A. Ensure that the emergency stop switch is in the RUN position.
B.
B. Measure the resistance between terminals 5 and 11 on the switch side of the connector for the emergency stop switch.
An open circuit condition is the correct measurement with the emergency stop switch in the RUN position.
C.
C. Place the emergency stop switch in the STOP position.
D.
D. Again, m easure the resistance between terminals 5 and 11 on the switch side of the connector for the emergency stop switch.
A short circuit condition is the correct measurement with the emergency stop switch in the STOP position.
Expecte Expected d Result:Result:
The measurements agree with the results that are stated above.
130 RENR9348-01 Troubleshooting Section
Results:
Results: