3 Installation
3.4 Electrical Installation
82 DC1 Frequency Inverter 10/12 MN04020003Z-EN www.eaton.com
3.4.4 Insulation test
The frequency inverter of the DC1 series are tested, delivered and require no
additional testing.
If insulation testing is required in the power circuit of the PDS, you must con-
sider the following measures.
3.4.4.1 Testing the motor cable insulation
Disconnect the motor cable from the connection terminals U, V and W of
the frequency inverter and from the motor (U, V, W). Measure the insula-
tion resistance of the motor cable between the individual phase conduc-
tors and between the phase conductor and the grounding conductor.
The insulation resistance must be greater than 1 M.
3.4.4.2 Testing the mains cable insulation
Disconnect the power cable from the mains supply network and from
the connection terminals 1/L, L2/N and L3 of the frequency inverter.
Measure the insulation resistance of the mains cable between the indi-
vidual phase conductors and between each phase conductor and the
protective conductor.
The insulation resistance must be greater than 1 M.
3.4.4.3 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 operating volt-
age of the motor but is not to exceed 1000 V.
The insulation resistance must be greater than 1 M.
CAUTION
On the control signal and the connection terminals of the fre-
quency inverter, no leakage resistance tests are to be per-
formed with an insulation tester.
CAUTION
Wait at least 5 minutes after switching the supply voltage off
before you disconnect one of the connection terminals
(L1/L, L2/N, L3, DC-, DC+, BR) of the frequency inverter.
￫
Consider the notes from the motor manufacturer in testing the
insulation resistance.
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