Insulationtesting - Eaton PowerXL DB1 Installation Manual

3 Installation

3.7 Insulationtesting

3.7 Insulationtesting
64
The variable frequency drive of the DB1 series are tested, delivered and
require no additional testing.
CAUTION

On the control signal and the connection terminals of the vari-
able frequency drive, 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+, BR) of the variable frequency drive.
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, V, and W
of the variable frequency drive and from the motor (U, V, W). Measure
the motor cable's insulation resistance between the individual phase
conductors and between each phase conductor and the protective con-
ductor.
The insulation resistance must be greater than 1 MΩ.
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 variable frequency
drive. Measure the mains cable's insulation resistance between the indi-
vidual phase conductors and between each phase conductor and the
protective conductor.
The insulation resistance must be greater than 1 MΩ.
Testing the motor insulation
▶ Separate the motor cable from the motor (U, V, W) and open the bridge
circuit (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 Motor Nom Voltage
but must not exceed 1000 V.
The insulation resistance must be greater than 1 MΩ.
￫
Consider the notes from the motor manufacturer in testing the
insulation resistance.
DB1 Variable Frequency Drives 09/17 MN040031EN www.eaton.com