ATEX-certified motor thermal protection function with Pt100 relays (+L514+Q971) 31
Pt100 relays
The Pt100 relays (3, 5 or 8 pieces) are configurable PLCs. In addition to the actuation of
the motor thermal protection function, it is possible to get, for example, a 4
…20 mA analog
temperature signal from each Pt100 sensor.
The used Pt100 relays are [Ex i] (intrinsically safe) approved associated apparatus (Ex i
barrier). The installation and cabling of the protection circuit in the ACS880 cabinet is done
as intrinsically safe according to EN/IEC 60079-14 ed. 5 clause 16.
If Pt100 sensors in the Ex Zone are not protected by an Ex type of protection (eg, Ex eb,
Ex ec or Ex d), the cabling from sensors to the terminal blocks in the drive must be done
as intrinsically safe [Ex i] installation. To comply with the [Ex i] requirements, use shielded
or shielded twisted pair cable.
If Pt100 sensors in the Ex Zone are protected by an Ex type of protection (eg, Ex eb, Ex ec
or Ex d), the intrinsically safe [Ex i] installation and cabling are not required. In case the
final installation does not need [Ex i] installation, the Ex i markings must be removed or
covered from the cabinet.
The drive delivery contains a notification label, stating: Note! This sensor circuit is not
executed as intrinsically safe [Ex i] installation.
If [Ex i] installation is not required, you must attach the label to the drive cabinet.
The temperature measurement circuit of ABB motors has basic insulation. For information
on the insulation of the Pt100 relay, see its data starting on page 60.
00 ACS880 ATEX cabinet.book Page 31 Tuesday, May 28, 2019 10:25 AM
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