INSTALLATION INSTRUCTIONS vacon • 59
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8
8.1.1 Cable and motor insulation checks
1. Motor cable insulation checks
Disconnect the motor cable from terminals U, V and W of the frequency converter 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 insulation resistance must be >1 MΩ..
2. Mains cable insulation checks
Disconnect the mains cable from terminals L1, L2 and L3 of the frequency converter and
from the mains. Measure the insulation resistance of the mains cable between each phase
conductor as well as between each phase conductor and the protective ground conductor.
The insulation resistance must be >1 MΩ..
3. Brake resistor cable insulation checks
Disconnect the brake resistor cable from terminals R+ and R- of the frequency converter
and from the brake resistor. Measure the insulation resistance of the cable between each
conductor as well as between conductors and the protective ground conductor.
The insulation resistance must be >1 MΩ..
4. 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 >1 MΩ.
5. Brake resistor insulation check
Disconnect the brake resistor cable and measure the insulation from the power terminals
to the ground terminal. The measurement voltage must equal at least the motor nominal
voltage but not exceed 1000 V. The insulation resistance must be >1MΩ.
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