Eaton DS7 Series, Manual

Page: 95 / 240

3 Installation
3.6 Insulation test
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
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3.6 Insulation test
The soft starters of the DS7 series are tested, delivered and require no
additional testing.
If insulation testing is required in the power circuit of the motor feeder, you
must consider the following measures.
• Checking the motor cable insulation
Disconnect the motor cable from the connection terminals 2/T1, 4/T2 and
6/T3 from the soft starter and from the motor (U, V, W). The insulation
resistance of the motor cable between the individual phase conductors
and between each phase conductor and the protective conductor can be
measured. The insulation resistance must be greater than 1 M
Ω .
• Checking the mains cable insulation
Disconnect the mains cable from the mains power supply and from the
connection terminals 1/L1, 3/L2 and 5/L3 of the soft starter. The
insulation resistance of the mains cable between the individual phase
conductors and between each phase conductor and the protective
conductor can be measured. The insulation resistance must be greater
than 1 M
Ω .
• Checking 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. The insulation
resistance can then be measured between the individual motor windings.
The measurement voltage must at least match the rated operating
voltage of the motor but is not to exceed 1000 V.
The insulation resistance must be greater than 1 M
Ω .
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CAUTION
On the control signal and the connection terminals of the soft
starter, no leakage resistance tests are to be performed with an
insulation tester.
￫
Consider the notes from the motor manufacturer in testing the
insulation resistance.