Protecting The Motor Against Overload Without Thermal Model Or Temperature Sensors; Protecting The Drive Against Ground Faults; Residual Current Device Compatibility - ABB ACS580 Series Hardware Manual

a 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.
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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.

Protecting the drive against ground faults

The drive is equipped with an internal ground fault protective function to protect
the unit against ground faults in the motor and motor cable. This function is not
a personnel safety or a fire protection feature. See the firmware manual for more
information.
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Residual current device compatibility

The drive is suitable for use with residual current devices of Type B.
Note: As standard, the drive contains capacitors connected between the main
circuit and the frame. These capacitors and long motor cables increase the ground
leakage current and may cause nuisance faults in residual current devices.
Guidelines for planning the electrical installation 119