EVT EVT Charging Systems & Infrastructure

Question 1

What SAE standard defines the Combined Charging System (CCS) connector used for DC fast charging in North America?

Accepted Answer

SAE J1772

Answer

SAE J1772 defines both the AC Level 1/Level 2 and the CCS DC fast-charge connector standard widely used in North America.

Question 2

A Level 2 EVSE operates at 240V AC and delivers up to 80A continuous. What is the maximum continuous output power in kilowatts?

Accepted Answer

19.2 kW

Answer

Power equals voltage × current, so 240V × 80A = 19,200 W = 19.2 kW.

Question 3

Which communication protocol does the CCS DC fast charger use to negotiate charging parameters with the vehicle?

Accepted Answer

ISO 15118 / DIN 70121

Answer

ISO 15118 (and its predecessor DIN 70121) defines the power line communication protocol used between CCS chargers and EVs to negotiate voltage, current, and authentication.

Question 4

What is the purpose of the Control Pilot (CP) signal in an SAE J1772 charging circuit?

Accepted Answer

It communicates vehicle connection state and maximum available current to the EVSE

Answer

The Control Pilot is a PWM signal whose duty cycle tells the vehicle the EVSE's maximum available current, and whose voltage level indicates the connection state.

Question 5

A technician measures 0V on the Control Pilot line while the EV is plugged into a Level 2 EVSE. What does this most likely indicate?

Accepted Answer

EVSE is in a fault or not energized state

Answer

A 0V CP signal indicates the EVSE is de-energized or in a fault condition; normal standby is +12V DC.

(EVT) Certified Electric Vehicle Technician Practice Test

(EVT) Certified Electric Vehicle Technician Practice Test

EVT EVT Charging Systems & Infrastructure