EVITP EVITP Maintenance and Troubleshooting 2 — Questions and Answers
Question 1: What error condition typically indicates a communication failure between the EVSE and the vehicle?
- An over-temperature fault
- A Control Pilot (CP) signal fault (Correct answer)
- A GFCI trip
- A contactor fault
Correct answer: A Control Pilot (CP) signal fault
A Control Pilot (CP) signal fault indicates a communication error in the pilot circuit between the EVSE and electric vehicle.
Question 2: Which type of meter should be used to measure insulation resistance in EVSE wiring?
- Clamp meter
- Voltmeter
- Megohmmeter (Correct answer)
- Wattmeter
Correct answer: Megohmmeter
A megohmmeter (megger) applies high voltage to measure insulation resistance and detect wiring degradation in EVSE circuits.
Question 3: What does a consistently tripping GFCI breaker in an EVSE installation most likely indicate?
- The vehicle battery is full
- A ground fault or leakage current in the circuit (Correct answer)
- Normal operation
- High demand on the grid
Correct answer: A ground fault or leakage current in the circuit
A repeatedly tripping GFCI indicates the presence of ground fault current or leakage current exceeding the safe threshold.
Question 4: What is the appropriate response when an EVSE displays an over-temperature fault?
- Continue charging at a reduced rate
- Ignore it and monitor later
- Shut down charging and investigate ventilation (Correct answer)
- Update the unit firmware
Correct answer: Shut down charging and investigate ventilation
An over-temperature fault requires immediate charging shutdown and investigation of cooling and ventilation to prevent equipment damage or fire.
Question 5: Which maintenance task helps prevent connector degradation at EVSE installations?
- Painting the connector housing
- Cleaning contacts and inspecting for wear regularly (Correct answer)
- Replacing cables annually
- Increasing charging current
Correct answer: Cleaning contacts and inspecting for wear regularly
Regular cleaning of electrical contacts and visual inspection for wear prevents connection degradation and ensures reliable charging performance.
Question 6: What is the purpose of the proximity pilot (PP) circuit in a Level 2 EVSE connector?
- To control charging current level
- To detect when the connector is properly inserted into the vehicle (Correct answer)
- To communicate with the utility grid
- To monitor the vehicle battery temperature
Correct answer: To detect when the connector is properly inserted into the vehicle
The proximity pilot circuit detects when the connector is properly seated in the vehicle inlet, enabling the charging process to begin safely.
EVITP EVITP Maintenance and Troubleshooting 2
What error condition typically indicates a communication failure between the EVSE and the vehicle?