Inspection Details - Mitsubishi Electric V Series Instruction Manual

22.3 Inspection Details

If you find any failure during the inspection, take corrective action immediately. If the product with any failure is used, the
product may be damaged, leading to secondary accidents.
22.3.1 Initial Inspection
22.3.1-1 Inspection prior to applying current
Perform the following inspections after installing the circuit breaker and before applying the current.
1. Are the electrical wires and bars fastened securely to the external line connection main
terminals?
2. Are any conductive foreign objects, such as screw, nails, processing chips from the panel
and also connecting lead wires for the withstand voltage tests, left around the terminals?
3. Is the front cover, base, etc. cracked or damaged?
4. Has the circuit breaker been flooded or is there condensation of dew?
(Note 1) Follow the standards in 22.3.1-2 when carrying out withstand voltage test.
(Note 2) Follow the standards in 22.3.1-2 when measuring the insulation resistance using a 500 V megohmmeter.
22.3.1-2 Test locations and standards for insulation resistance and withstand voltage tests
Between all the terminals of the main circuit connected together and the enclosure or mounting
plate.
Between each pole of main circuit and the other poles connected together and to the enclosure or
mounting plate.
Between the upper terminals connected together and the lower terminals connected together.
Between each control and auxiliary circuit not normally connected to the main circuit and the main
circuit connected together.
Between each control and auxiliary circuit not normally connected to the main circuit. (Note 3)
(Note 1) Must be no less than 50 MΩ for the circuit breaker alone.
(Note 2) Voltage application time is 1 min.
(Note 3) There are some locations that withstand voltage tests must not be performed. Check the following CAUTION.
Do not perform the withstand voltage test for the following terminal.
Terminal mark: N1 , N2 , P4 , RS1 , RS2 , D1 , D2 , DT1 , DT2
Before performing the test, disconnect the wires D1 , D2 , DT1 , and DT2 . Failure to do so may result in damage to
the UVT.
E-48
CAUTION
Inspection item
Test locations
CAUTION
Criteria
Must be tightened at the designated
tightening torque (M12 screw: 45±5 N·m)
Must be removed completely.
There must be no cracks or damage.
There must be no flooding or dew
condensation.
Withstand
Insulation
resistance test voltage test
(MΩ) (Note 1) (V AC) (Note 2)
ON OFF ON
≥ 5 ≥ 5 3500
ー
≥ 5 3500
ー ー
≥ 5
≥ 5 ≥ 5 3500
≥ 5 ≥ 5 2000
OFF
3500
ー
3500
3500
2000