Implementation Of The Manual Reset; Indications Of The Motor Thermal Protection Function; Commissioning The Drive For A Motor In A Hazardous Area - ABB ACS880 Series User Manual

ATEX-certified motor thermal protection function with PTC thermistor relays (+L513+Q971) 21
Note: ABB recommends that you do not use the autoreset setting (that is, short-circuit the
reset switch terminals of the PTC relay) with a safety device protecting an Ex motor.
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Implementation of the manual reset

After the ATEX-certified motor thermal protection function activates, the motor must not
restart before a manual reset command is given.
The manual reset is set in the ATEX-certified PTC thermistor relay at the factory. This
complies with the ATEX requirement on manual reset, which means that you do not have
to configure any faults in the drive or FSO parameters. If you change the manual reset
setting in the PTC thermistor relay, make sure that the user cannot restart the drive without
a manual reset.
You can configure the manual reset either in:
• the drive with the motor overtemperature or STO indication parameters
• the FSO module by connecting a reset circuit to the FSO module.
ACS880-07/17/37 and ACS880-17LC/37LC drives with the option +Q978 or +Q979
(Emergency stop): In these safety functions, a reset circuit is connected to the FSO module
and the user must reset the safety function with the emergency stop reset button. The user
must also reset the ATEX-certified motor thermal protection function with the emergency
stop reset button. Do not change this setting.
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Indications of the motor thermal protection function

An indication of the safety function can come from several sources:
• the motor overtemperature indication in the drive
• the STO indication in the drive
• the STO or SS1 indication in the FSO module.
If you want to avoid parallel indications in overtemperature situations, you can set one or
several of the indication parameters value to No indication (or None) or Event:
• the motor overtemperature indication with drive parameters 31.01...31.02 or
35.11...35.12
• the STO indication in the drive with drive parameter 31.22 STO indication run/stop
• the STO or SS1 indication in the FSO module with FSO parameter FSOGEN.61 STO
indication ext request.
If the PTC thermistor relay is not in the manual reset mode, make sure that at least one of
these indications generates a fault.

Commissioning the drive for a motor in a hazardous area

Commission the drive according to the requirements and limitations set by the application,
the motor manufacturer's instructions, drive firmware manual, local laws and regulations
and this manual.
The certificate of the Ex motor typically requires that you set a minimum limit for the output
switching frequency of the drive. Make sure that the Ex motor is operated above the minimum
output switching frequency specified by the motor manufacturer.