Mitsubishi Electric AE-SW Series Instruction Manual page 37

2. Appearance and structure
Refer to P.4 and P.5 of this instruction manual.
3. Preparation before inspection
To perform a normal (initial or periodic) inspection, open
(turn off) the upper breakers and verify that there is no cur-
rent flowing. For the control circuit, perform an inspection
with the power shut off whenever possible, except when
inspecting its operation.
4. Inspection
4.1 Initial inspection
4.1.1 Inspection items
After installing a breaker, inspect the following points before applying the current.
Inspection items
1. Cables and conductors securely connected to the main circuit terminals
2. Conductive foreign objects, such as screws, processing chips from the panel
processing, or lead wires connected in withstand voltage tests, left around terminals
3. Cracks or breakage on the front cover and the base
4. Flood or condensation on the breaker
(1) When measuring the insulation resistance with a 500 V insulation tester, follow the standards described in 4.1.2.
(2) When performing a withstand voltage test, follow the standards described in 4.1.2.
4.1.2 Points and standards for the insulation resistance test and withstand voltage test
(1) Points for the insulation resistance test and withstand voltage test
Test point
Between the main circuit live parts and the ground
Between live parts of different polarity poles
Between the power supply and load terminals
Between the main circuit live parts and the control/operation circuit live parts
Between the control/operation circuit live parts and the ground
(2) Standards for the insulation resistance test and the AC withstand voltage test
Insulation resistance test : Must be 5 M or more (50 M or more for the air circuit breaker alone)
AC withstand voltage test :
Apply for
1 minute
When performing the withstand voltage test on the main circuit with the breaker built into a panel, remove the wiring "D1" and "D2" to
the UVT controller (for 380-460V AC, the external unit input terminals "IN1" and " IN2"). Failure to do so could break the UVT controller.
CAUTION
When inspecting a
drawout type break-
er with its breaker
pulled out, turn off
the breaker. (Refer
to P.14.)
Insulation resistance test
ON
™
™
−
™
™
Between the main circuit live parts and the ground
Between live parts of different polarity poles
Between the power supply and load terminals
Between the main circuit live parts and the control/operation circuit live parts : 3500 V
Between the control/operation circuit live parts and the ground : 2000 V
(for the dielectric test forbidden area, follow the speci cation on the control circuit
terminal block nameplate)
ON
Connected at speci ed tightening torque (M12 screw: 45 ± 5 N·m)
Free of objects and clean
No cracks or breakage
No ood or condensation
Withstand voltage test
OFF ON
™ ™
™ ™
−
™
™ ™
™ ™
CAUTION
Criteria
OFF
™
™
™
™
™
: 3500 V
: 3500 V
: 3500 V
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