nord 6051302, Operating And Assembly Instruction Manual

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Table of Contents
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1.3.8 Operation with frequency inverters
Three-phase asynchronous motors of type SK 63 /. – SK 250 /. have been 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 in use.
The insulation system used by NORD consists of suitable varnished copper wire, phase insulation,
homogeneous impregnation and groove lining as insulation against earth and is designed for the
increased requirements of the link circuit inverter in the standard version.
The maximum permissible FI input voltage is 500 V +10 %. Link circuit voltages in excess of 750 V DC
are not permissible. Peak voltages due to the system of inverter, cable and motor must not exceed the
following values when the motor is warm due to operation.
If the values are outside of the permissible range, du/dt or sine wave filters may be used (note additional
voltage drop).
The cable lengths shown in the diagram are for guidance only and may deviate corresponding to the
specific conditions.
In principle, attention must be paid to an EMC-compliant installation.
Additional information on operation on the frequency inverter, in particular information on the max.
permissible speed, the thermal design and the possible torques, can be found in the current NORD
motor catalogue M7000.
Permissible impulse voltages depending on the voltage rise time
Impu
ls
e v
ol
tag
e [
V]
Voltage rise time [µs]