Electrical installation
59
Electrical installation
What this chapter contains
This chapter describes the electrical installation procedure of the drive.
WARNING! The work described in this chapter may only be carried out by a qualified
electrician. Follow the Safety instructions on the first pages of this manual. Ignoring
the safety instructions can cause injury or death.
Make sure that the drive is disconnected from the mains (input power) during
installation. If the drive is already connected to the mains, wait for 5 min after
disconnecting mains power.
Checking the insulation of the assembly
Drive
Do not make any voltage tolerance or insulation resistance tests (e.g. hi-pot or
megger) on any part of the drive as testing can damage the drive. Every drive has
been tested for insulation between the main circuit and the chassis (2500 V rms
50 Hz for 1 second) at the factory. Also, there are voltage-limiting circuits inside the
drive which cut down the testing voltage automatically.
Input cable
Check the insulation of the input cable according to local regulations before
connecting it to the drive.
Motor and motor cable
Check the insulation of the motor and motor cable as follows:
1. Check that the motor cable is disconnected from the drive output terminals U2,
V2 and W2.
2. Measure the insulation resistances of the motor cable and the motor between
each phase and the Protective Earth by using a measuring voltage of 1 kV DC.
The insulation resistance must be higher than 1 Mohm.
PE
M
ohm
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