Hitachi SH1 Series Basic Manual page 110

Chapter 6
6.3 Insulation resistance test
・When testing an external circuit with a megger, disconnect all
the external circuit cables from the inverter to prevent it from
being exposed to the test voltage.
・In the control circuit carry out a conduction test, use a
multimeter (with high resistance range), do not use a megger®
or buzzer /continuity tester.
・The insulation resistance test of the inverter itself is carried out
only at the main circuit, do not perform an insulation
resistance test in the control circuit.
・It is recommended the use of a DC500V megger® for the
insulation resistance test.
Power
Supply
Do not connect
into power supply
DC500V Megger®
*1)SH1-03410-H(SH1-1600H)~SH1-04810-H(SH1-2200H) do not have EMC filter.
6.4 Dielectric withstand test
・Do not carry out a withstand voltage test for the inverter.
The test may damage its internal parts, deteriorating the
inverter.
・Before the main circuit test with a megger, remove the jumper
for switching the inverter's internal filter function, and then
connect terminals R, S, T, U, V, W, P, PD, N, RB, R0, and T0 by
wires as shown in the figure below. Subsequently, carry out the
test.
・After the test using the megger, remove the wires from
terminals R, S, T, U, V, W, P, PD, N, RB, R0, and T0, and connect
the jumper for switching the inverter's internal filter function
at the original position.
・Furthermore, depending on the model, the RB terminal may
not be present. Please confirm in "2.9 Wiring to the main
circuit terminal block".
P PD
R
N
S
T Ground
Ground
terminal
terminal
R0
T0
Make sure to disable the EMC filter or
remove the filter jumper before testing. *1)
6-3
Inspection and maintenance
Motor
RB
U
V
W
Do not connect the motor
M
3φ