Measuring The Insulation Resistance Of The Motor Cable; Measuring The Insulation Resistance Of The Mains Cable; Measuring The Insulation Resistance Of The Motor - Danfoss iC7 Series Installation Manual

Installation Guide | iC7 Series Liquid-cooled System Modules
DC/DC CONVERTER PRE-CHARGING
If the DC source is connected to the DC/DC converter without first pre-charging the DC filter capacitors, the inrush current can
damage the equipment.
Before connecting the DC source to the DC/DC converter, power on the DC/DC converter and pre-charge the DC filter

capacitors to the same voltage as the DC source.
See the iC7 Series DC/DC Converter Application Guide for details.


Measuring the Insulation Resistance of the Motor Cable

6.2
Use these instructions to check the insulation of the motor cable.
The AC drive is already measured at the factory.
1.
Disconnect the motor cable from the terminals U, V, and W, and from the motor.
2.
Measure the insulation resistance of the motor cable between phase conductors 1 and 2, between phase conductors 1 and 3,
and between phase conductors 2 and 3.
3.
Measure the insulation resistance between each phase conductor and the grounding conductor.
4.
The insulation resistance must be >1 MΩ at the ambient temperature of 20 °C (68 °F).

Measuring the Insulation Resistance of the Mains Cable

6.3
Use these instructions to check the insulation of the mains cable.
The AC drive is already measured at the factory.
1.
Disconnect the mains cable from the terminals L1, L2, and L3, and from mains.
2.
Measure the insulation resistance of the mains cable between phase conductors 1 and 2, between phase conductors 1 and 3,
and between phase conductors 2 and 3.
3.
Measure the insulation resistance between each phase conductor and the grounding conductor.
4.
The insulation resistance must be >1 MΩ at the ambient temperature of 20 °C (68 °F).

Measuring the Insulation Resistance of the Motor

6.4
Use these instructions to check the insulation of the motor.
The AC drive is already measured at the factory.
Obey the instructions of the motor manufacturer.
1.
Disconnect the motor cable from the motor.
2.
Open the bridging connections in the motor connection box.
3.
Measure the insulation resistance of each motor winding. The voltage must be the same or higher than the motor nominal
voltage, but at least 1000 V.
4.
The insulation resistance must be >1 MΩ at the ambient temperature of 20 °C (68 °F).
5.
Connect the motor cables to the motor.
6.
Do the final insulation check on the drive side. Put all phases together and measure to the ground.
7.
Connect the motor cables to the drive.
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