Omron RX Series - Test Methods; Megger Test; Withstand Voltage Test

11 - 9
11 Maintenance and Inspection
High-function General-purpose Inverter 3G3RX-V1 User's Manual (SBCE-367)
11-3 Test Methods
11
11-3-1 Megger Test
11-3 Test Methods
• Before performing a megger test on external circuits, be sure to disconnect wires from all inverter
terminals to prevent the test voltage from being applied to the inverter.
• Use a 500 VDC megger for a megger test.
• For a megger test on the inverter main circuit, remove the short-circuit bar for switching the inverter
built-in filter function and then short-circuit the terminals R/L1, S/L2, T/L3, U/T1, V/T2, W/T3, P/+2,
+1, N/–, RB, Ro, and To with wires, as shown below.
After a megger test, remove the short-circuit wires from each terminal and reconnect the short-circuit
bar for switching the inverter built-in filter function.
Note that the terminal RB is provided only for the inverters with a 22 kW or lower capacity.
Precautions for Correct UsePrecautions for Correct Use
• Use a tester (in a high resistance range) for a power-on test on the control circuit. Do not use a
megger or buzzer.
• For the inverter, do not perform a megger test on the control circuit. Perform it only on the main
circuit.
• Be sure to remove the short-circuit bar for switching the built-in filter function.
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.
11-3-1 Megger Test
11-3-2 Withstand Voltage Test
R/L1
S/L2
T/L3
Ro
To
Ground
terminal
Power
supply
Do not connect
the power wire.
500 VDC megger
Be sure to remove the short-circuit bar
for switching the built-in filter function.
Ground
terminal
P/+2 +1 N/– RB
U/T1
V/T2
W/T3
Do not connect
to the motor.
Motor
IM