34 ATEX-certified motor thermal protection function with Pt100 relays (+L514+Q971)
Resetting the ATEX-certified motor thermal protection
function
A manual reset is mandatory in the temperature protection function, if it is required for
ensuring the compliance of the system with Ex/ATEX regulations. The Pt100 relay is reset
automatically. To fulfill the ATEX requirement on manual reset, make sure that the user
cannot restart the drive without a manual reset.
You must configure the manual reset either in:
• the drive with the motor overtemperature or STO indication parameters (see
page 44)
• the FSO module by connecting a reset circuit to the FSO module (see page 46).
ACS880-07/17/37 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. In this case, the user must reset
also the ATEX-certified motor thermal protection function with the emergency stop reset
button. Do not change this setting.
Indications of the ATEX-certified 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 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 (see page 44),
• the STO indication in the drive with drive parameter 31.22 STO indication run/stop
(see page 44),
• the STO indication in the FSO module with FSO parameter FSOGEN.61 STO
indication ext request (see page 47).
Note: Make sure that at least one of these indications generates a fault to ensure that the
required manual reset is implemented.
00 ACS880 ATEX cabinet.book Page 34 Tuesday, May 28, 2019 10:25 AM
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