ABB ACS880-07 - Implementing the Emergency Stop Function; Protecting the Drive against Ground Faults; Protecting the Motor against Overload Without Thermal Model or Temperature Sensors; Residual Current Device Compatibility

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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.
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.
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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.
Implementing the emergency stop function
You can order the drive with an emergency stop function (option).
See the appropriate option manual for more information.
Note: The UCU control unit does not support options +Q978 and +Q979.
Manual code
(English)
User’s manualOption
code
3AUA0000119895Emergency stop, stop category 0 (using main contactor/breaker)+Q951
3AUA0000119896Emergency stop, stop category 1 (using main contactor/breaker)+Q952
3AUA0000119908Emergency stop, stop category 0 (using Safe torque off)+Q963
3AUA0000119909Emergency stop, stop category 1 (using Safe torque off)+Q964
3AUA0000145920Emergency stop, stop category 0 or 1 (using main contactor/breaker
and Safe torque off)
+Q978
3AUA0000145921Emergency stop, stop category 0 or 1 (using Safe torque off)+Q979
108 Guidelines for planning the electrical installation