Protecting The Motor Against Overload Without Thermal Model Or Temperature Sensors - ABB ACS880 Manual

Electrical planning guidelines 39
motor thermal protection function that protects the motor and switches off the
current when necessary. Depending on a drive parameter value, the function either
monitors a calculated temperature value (based on a motor thermal model) or an
actual temperature indication given by motor temperature sensors.
The motor thermal protection model supports thermal memory retention and speed
sensitivity. The user can tune the thermal model further by feeding in additional motor
and load data.
The most common temperature sensor types are PTC or Pt100.
For more information, see the firmware manual.
Protecting the motor against overload without thermal model or
￭
temperature sensors
Motor overload protection protects the motor against overload without using 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 UL/IEC 61800-5-1 standard in
conjunction with UL/IEC 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 UL/IEC 60947-4-1
and NEMA ICS 2.
The motor overload protection supports thermal memory retention and speed
sensitivity.
For more information, see drive firmware manual.