Motor; Insulation Resistance Measurements; Preparations; External Mcb Insulation Test - ABB ACS580MV Commissioning Manual

28 Standard Commissioning Process
NOTICE! The pickup current for the time over current protection must be given by the
system engineer. This strongly depends on the particular application. If the drive
integrated with MBU cabinet, pay more attention to the 'Bypass mode', the rated input
current is based on the motor current. In some situation, the setting of protective value
should be modified.

Motor


All checks and insulation measurements of the motor and its auxiliary systems must be
performed according to the instructions of the motor manufacturer.
Checking of the motor includes the following:
•
Insulation resistance. The insulation resistance must be measured or confirmation of
the measurement must be obtained. In case measurement has to be performed by the
service engineer, please refer to
•
Oil quantity of lubrication unit.
•
Visual check of electrical and pneumatic instrumentation.
•
All electrical instruments, pumps and electrically controlled valves are shown in the
circuit diagram of the motor auxiliaries. Operation of these devices will be checked
when the external control signals are tested, see
•
Temperature measurement of windings and bearings.
•
Vibration sensors.

Insulation Resistance Measurements

Before any of the components in the drive system can be energized, it must be assured
that they are able to withstand the voltage stress. This can be verified by measuring the
insulation resistance. If the measured insulation resistance value of the motor, transformer
or converter is too low, the reason may be that insulators, windings etc. have moisture in
them and it may be necessary to dry the windings.
It is advisable to compare the test results with the test reports from the supply factories.
The contractor or customer can make the insulation resistance measurements on the
supply cables and motor, in that case a signed test-protocol of all measurements must be
attached to the commissioning report.

Preparations


Make sure that the Main Circuit Breaker is racked out.
Disconnect the cables between the converter and the motor and isolate them from ground
and the frames of the converter and the motor.

External MCB Insulation Test


The MCB is commissioned and the insulation tests are performed according to the
documentation of the manufacturer (The signed MCB commissioning report must be
received from the responsible personnel or company).
Motor Insulation Test.
Cold commissioning.