04/10 MN04020001Z-EN
Electrical Installation
53
Insulation testing
The frequency inverter of the M-Max
TM
series are tested, delivered
and require no additional testing.
If insulation testing is required in the power circuit of the PDS, you
must consider the following measures.
Testing the motor cable insulation
Disconnect the motor cable from the connection terminals U/T1,
V/T2 and W/T3 of the frequency inverter and from the motor (U, V,
W). Measure the insulation resistance of the motor cable between
the individual phase conductors and between the phase conductor
and the protective conductor.
The insulation resistance must be greater than 1 MO.
Testing the mains cable insulation
Disconnect the power cable from the mains supply network and
from the connection terminals L1, L2/N and L3 of the frequency
inverter. Measure the insulation resistance of the mains cable
between the individual phase conductors and between each phase
conductor and the protective conductor.
The insulation resistance must be greater than 1 MO.
Testing the motor insulation
Disconnect the motor cable from the motor (U, V, W) and open the
bridge circuits (star or delta) in the motor terminal box. Measure
the insulation resistance of the individual motor windings. The
measurement voltage must at least match the rated voltage of the
motor but is not to exceed 1000 V.
The insulation resistance must be greater than 1 MO.
i
Warning!
On the control signal and the connection terminals of the
frequency inverter, no leakage resistance tests are to be
performed with an insulation tester.
j
Warning!
Wait at least 5 minutes after switching the supply voltage
off before you disconnect a connection on the connection
terminals (L1, L2/N, L3, U/T1, V/T2, W/T3, R+, R-) of the
frequency inverter.
h
Consider the information from the motor manufacturer in
testing the insulation resistance.
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