Omron SYSDRIVE MX2 SERIES, User Manual

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11 Maintenance and Inspection
Multi-function Compact Inverter 3G3MX2-V1 User’s Manual (I585-E1)
11
-1 Main
ten
ance a
nd I
n
spe
ctio
n
11
11-1-
5 Megger
Test
Before performing a megger test on external circuits, be sure to disconnect all the terminals of the
inverter and not to apply the test voltage to the inverter. Use a 500 VDC megger for a megger test.
For a megger test on the inverter main circuit, short-circuit the terminals R/L1, S/L2, T/L3, U/T1, V/T2,
W/T3, RB,
+
1, P/
+
2, and N/
−
with wires, as shown below.
Because the insulation resistance rating of the single inverter unit is 5 M
Ω
or higher, it is normal if the
resistance is 5 M
Ω
or higher.
• For the inverter, do not perform a megger test on the control circuit. Perform it only on the main cir-
cuit.
• Use a tester (in a high resistance range) for a power-on test on the control circuit. Do not use a meg-
ger or buzzer.
Do not conduct a withstand voltage test on any part of the inverter.
Doing this test is dangerous because it may cause damage to or deterioration of the parts inside the
inverter.
Use the following procedure to check conditions of the inverter and converter units by using a tester.
1
Disconnect the externally connected power supply wires (R/L1, S/L2, T/L3), the motor
connection wires (U/T1, V/T2, W/T3), and the regenerative braking resistance (P/
+
2, RB).
2
Prepare a tester. Use the 1
Ω
resistance measurement range.
11-1-5 Megger Test
11-1-6 Withstand Voltage Test
11-1-7 Inverter/Converter Unit Test
Preparation
R/L1 S/L2 T/L3 U/T1 V/T2 W/T3
RB
IM
+1 P/+2 N/-
500-VDC megger
Do not connect to the
motor.
Motor
Ground
terminal
Do not connect the
power supply wires.
Power supply