NORD Drivesystems B1091-1 - Manual (Page 9)

1 Technical explanations
B 1091-1 GB-3213 9
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1.3 Wiring:
• No filters which come into the resonance range may be wired between the inverter and the motor
The resulting overvoltage could damage the insulation of the cable or the motor.
• Only filters which are prescribed or approved by the supplier of the frequency inverter may be
used.
• The wires used must have an insulation strength of at least 2,000 VDC.
• Additional mains or motor chokes reduce the output voltage of the frequency inverter and are not
considered in this planning guideline. Chokes shift the threshold of the field weakening range
downwards and the field weakening becomes greater.
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1.4 Commissioning
• Set the pulse frequency of the output stage to 4 - 6 kHz. With NORD frequency inverters, 6 kHz
corresponds to the standard frequency of the frequency inverter.
• Parameterise the vector regulation to the motor used.
• The i²*t monitoring must be set to the rated current for the motor.
• The maximum frequency must be set according to the application and must not exceed 100 Hz.
• Activate the thermistor evaluation.
• Check the thermistor monitoring by interrupting the cable connection to the frequency inverter.
ATTENTION Gear unit damage - high speed
The maximum permissible input speed of the gear unit must be observed.
Exceeding the permissible speed may cause overheating and damage to the components of the gear units, up to
the complete destruction of the gear unit.
For frequency inverter operation the speed of the motor must be limited according to the planning specifications.
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