Hitachi SJ Series, User Manual

Page: 646 / 786

19-4
Chapter 19
Maintenance and Inspection
19.4 Megger Test
・
When conducting megger test on the external circuit,
remove all terminals of the inverter to avoid applying the
test voltage is not applied to the inverter.
・
For energization test on the control circuit, use a tester
(high-resistance range), and do not use a megger or
buzzer.
・
Conduct megger test for the inverter itself only on the
main circuit, and do not perform megger test on the
control circuit.
・
For megger test, use a DC500V megger.
19.5 Pressure Test
・
Do not perform pressure test.
If pressure test is conducted, it is dangerous because the
components inside the inverter may be damaged or
deteriorated.
・
Before conducting a megger test on the inverter main
circuit, make sure to remove the short bar for switching
the filtering function included in the inverter, and short
terminals R, S, T, U, V, W, P, PD, N, RB, R0, and T0 as
shown in the figure below.
・
After megger test, remove the wires on which R, S, T, U,
V, W, P, PD, N, RB, R0, and T0 terminals that are shorted,
and connect the short bar for switching the filter function
included in the inverter to the original position.
M
R
S
T
U
V
W
P PD N RB
Earth terminal
Power supply
Motor
Make sure to remove the short bar for switching
internal filter function to disable the function.
DC500V megger
Do not connect
power supply
wires.
Do not connect wires to the
motor.
R0
T0
Earth terminal