EVITP Technology and Equipment 2

Question 1

Which communication protocol is most commonly used by EVSE to communicate with the electric vehicle during a DC fast charge session?

Accepted Answer

Combined Charging System (CCS) PLC

Answer

CCS uses Power Line Communication (PLC) over the pilot line to enable the vehicle and EVSE to negotiate charging parameters during DC fast charging.

Question 2

What is the purpose of the contactor in a DC fast charging station?

Accepted Answer

Isolate high-voltage DC from the output connector when not charging

Answer

The contactor is a high-current switch that physically connects or disconnects the DC bus from the charging connector, ensuring safety when the connector is not engaged.

Question 3

In an EVSE network management system, what does OCPP stand for?

Accepted Answer

Open Charge Point Protocol

Answer

OCPP (Open Charge Point Protocol) is an open standard that allows EVSE hardware from different manufacturers to communicate with a common network management backend.

Question 4

A technician notices a Level 2 EVSE is delivering only 16 A instead of the rated 32 A. Which component, if faulty, would most likely cause this output reduction?

Accepted Answer

A failed or thermally derated power relay in the EVSE

Answer

A failed or overheated relay/contactor in the EVSE can cause it to thermally derate, limiting current output to protect the hardware.

Question 5

What is the typical pilot signal frequency used in SAE J1772 EVSE-to-vehicle communication?

Accepted Answer

1 kHz

Answer

SAE J1772 specifies a 1 kHz pilot signal used on the control pilot line to communicate maximum available current and charger state to the vehicle.

(EVITP) Electric Vehicle Infrastructure Program Practice Test

(EVITP) Electric Vehicle Infrastructure Program Practice Test

EVITP Technology and Equipment 2