Motor Thermal Protection - Danfoss VLT Refrigeration Drive FC 103 Design Manual

System Integration
Illustration 3.17 Common Joint Connection for Long Cable
Lengths
Illustration 3.18 Parallel Cables without Load
Illustration 3.19 Parallel Cables with Load
MG16G202
Design Guide
Illustration 3.20 LC Filter for Long Parallel Cables
Illustration 3.21 Long Cables in Series Connection
Refer to Table 7.7 for information about cable lengths for
multiple parallel motor connections.

3.5.7 Motor Thermal Protection

The frequency converter provides motor thermal
protection in several ways:
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Torque limit protects the motor from overload
independent of the speed.
Minimum speed limits the minimum operating
speed range, for instance between 30 and 50/60
Hz.
Maximum speed limits the maximum output
speed.
Input is available for an external thermistor.
Electronic thermal relay (ETR) for asynchronous
motors simulates a bi-metal relay based on
3 3
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