Protecting The Motor Against Overload Without Thermal Model Or Temperature Sensors; Protecting The Drive Against Ground Faults; Residual Current Device Compatibility; Implementing The Emergency Stop Function - ABB ACS880-37LC-0390A-7 Hardware Manual

86 Guidelines for planning the electrical installation
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 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.
An optional ground fault monitoring device (+Q954) is available for IT (ungrounded) systems.
The option includes a ground fault indicator on the drive cabinet door.

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.

Implementing the emergency stop function

You can order the drive with an emergency stop function (option).
See the appropriate option manual for more information.
Name
Emergency stop, stop category 0 (option +Q951) for ACS880-07/17/17LC/37/37LC drives
user's manual
Emergency stop, stop category 1 (option +Q952) for ACS880-07/17/17LC/37/37LC drives
user's manual

Implementing the Safe torque off function

See chapter The Safe torque off function (page 217).
Code
3AUA0000119895
3AUA0000119896