青云翻译

Make sure the customer wiring to do control line to ground (not received a total power n)

Confirm customer wiring is grounding control lines (with which the power n is not received)

Confirmed whether the customer wiring does make the pilot wire earth (not to be possible altogether to meet with power N)

Identification of customers wiring whether Line of Control to Earth (and power N sang not total)

Confirm customer wiring is grounding control lines (with which the power n is not received)