Running The Motor; Cable And Motor Insulation Checks - Vacon 20CP Installation, Technical And Maintenance Manual

Commissioning
6.3

Running the motor

MOTOR RUN CHECK LIST
Before starting the motor, check that the motor is mounted properly and ensure
that the machine connected to the motor allows the motor to be started.
Set the maximum motor speed (frequency) according to the motor and the
machine connected to it.
Before reversing the motor make sure that this can be done safely.
Make sure that no power correction capacitors are connected to the motor cable.
Make sure that the motor terminals are not connected to mains potential.
6.3.1

Cable and motor insulation checks

1. Motor cable insulation checks
Disconnect the motor cable from terminals U, V and W of the AC drive and from the motor.
Measure the insulation resistance of the motor cable between each phase conductor as
well as between each phase conductor and the protective ground conductor. The insula-
tion resistance must be >1MΩ at ambient temperature of 20°C.
2. Mains cable insulation checks
Disconnect the mains cable from terminals L1 (L), L2 (N) and L3 of the AC drive and from
the mains. Measure the insulation resistance of the mains cable between each phase con-
ductor as well as between each phase conductor and the protective ground conductor. The
insulation resistance must be >1MΩ at ambient temperature of 20°C.
3. Motor insulation checks
Disconnect the motor cable from the motor and open the bridging connections in the
motor connection box. Measure the insulation resistance of each motor winding. The
measurement voltage must equal at least the motor nominal voltage but not exceed 1000
V. The insulation resistance must be >1MΩ at ambient temperature of 20°C.
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