Motors – Operating and Assembly Instructions
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1.3.7 Operation with frequency inverter
Type SK 63 ./. – SK 225 ./. three phase asynchronous motors are qualified for operation with link circuit
inverters according to DIN EN 60034-18-41 (2014).
Please also observe the operating instructions for the frequency inverter which is used.
The insulation system used by NORD consists of suitable varnished copper wire, phase insulation,
homogeneous impregnation and groove lining as insulation against earth, and in the standard version
is designed for the increased requirements for link circuit inverters.
The maximum permissible FI input voltage is 500 V +10%. Link circuit voltages in excess of 750 V DC
are not permissible. When the motor is warm due to operation, the peak voltages due to the system, the
inverter, the cable or the motor must not exceed the following values.
If the values are outside of the permissible range, du/dt or sine wave filters may be used (not the
additional voltage drop).
The cable lengths shown in the diagram are for guidance only and may deviate according to the specific
conditions.
For additional information for operation with a frequency inverter, especially with regard to information
about the maximum speed, thermal design and possible torques, please refer to the current NORD
motor catalogue M7000.
Permissible impulse voltages depending on voltage rise-time
Impulse voltage [V]
Voltage rise time [µs]
200
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