Goodrive35 inverters Appendix D
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D.4.4 Insulation checking
Check the insulation of the motor and motor cable as follows:
1. Check that the motor cable is connected to the motor and disconnected from the drive
output terminals U, V and W.
2. Measure the insulation resistance between each phase conductor and the Protective
Earth conductor using a measuring voltage of 500 V DC. For the insulation resistance of
other motors, please consult the manufacturer’s instructions.
Note: Moisture inside the motor casing will reduce the insulation resistance. If moisture is
suspected, dry the motor and repeat the measurement.
D.5 Breaker and electromagnetic contactor
It is necessary to add fuse for the avoidance of overload.
It is appropriate to use a breaker (MCCB) which complies with the inverter power in the
3-phase AC power and input power and terminals (R, S, T). The capacity of the inverter
should be 1.5-2 times of the rated current.
Due to the inherent operating principle and construction of circuit breakers,
independent of the manufacturer, hot ionized gases may escape from the
breaker enclosure in case of a short-circuit. To ensure safe use, special
attention must be paid to the installation and placement of the breakers.
Follow the manufacturer’s instructions.
It is necessary to install the electromagnetic contactor in the input side to control the
switching on and off safety of the main circuit. It can switch off the input power supply when
system faults.
D.5.1 The inverters of AC 3PH 380V(-15%)~440V(+10%)
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