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54 Planning the electrical installation
Protecting the motor against overload without the thermal model
or temperature sensors
Motor overload protection protects the motor against overload without using the
motor thermal model or temperature sensors.
Motor overload protection is required and specified by multiple standards including
the US National Electric Code (NEC) and the common IEC/UL 61800-5-1 standard in
conjunction with IEC/UL 60947-4-1. The standards allow for motor overload
protection without external temperature sensors.
The protection feature of the drive allows the user to specify the class of operation
in the same manner as the overload relays are specified in standards IEC/UL 60947-
4-1 and NEMA ICS 2.
The motor overload protection supports thermal memory retention and speed
sensitivity.
For more information, see the drive firmware manual.
Protecting the motor and motor cable in short circuits
The drive protects the motor cable and motor in a short-circuit situation when:
•
the motor cable is sized correctly
•
the motor cable type complies with the motor cable selection guidelines by ABB
•
the cable length does not exceed the allowed maximum length specified for the
drive
•
the setting of parameter 99.10 Motor nominal power is equal to the value on the
motor rating plate.
The electronic power output short-circuit protection circuitry meets the
requirements of IEC 60364-4-41 2005/AMD1, Clause 411.
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