Pt100 Relays - ABB ACS880 Series User Manual

30 ATEX-certified motor thermal protection function with Pt100 relays (+L514+Q971)
ACS880-07/17/37 and ACS880-17LC/37LC drives with option +Q978: Also the main
contactor/breaker is opened.
ACS880-07 drives (frames n×DxT + n×R8i) with a main contactor/breaker (option
+F250/+F255), ACS880-17/37 drives (frames n×R8i + n×R8i) and ACS880-17LC/37LC
drives (frames n×R8i + n×R8i): When the STO function is activated in the inverter unit, the
main contactor/breaker is opened after user-defined delay (defined with parameter 94.11,
the default value is 600 s). See hardware and firmware manuals for more information.
Other safety functions in the drive can also use the STO function. Also, an FSO module can
be included in the ATEX-certified motor thermal protection function. See the circuit diagrams
delivered with the drive for the actual safety circuitry.
The FSO safety functions module (FSO-12 or FSO-21) is an optional device used with the
ACS880 drives to implement safety functions. When installed, it reserves the standard STO
connection of the drive.
The motor thermal protection function is implemented as follows:
• without an FSO module, the opening contacts of the relay(s) open the STO circuit of
the drive.
• with an FSO module, the opening contacts of the relay(s) activate the STO or Safe stop
1 (SS1) function of the FSO module, and the FSO module opens the STO circuit of the
drive.
Select the stop category according to the system risk assessment.
The protection function circuit is motor-specific. The function stops only the motor where
overtemperature is detected.
It is possible to get information on the status of the protection function through a
normally-open contact of the relay. The information can be obtained separately from the
bearing and stator sensors. The contact can be wired to a digital input on the drive control
unit or to an external control system. See the wiring instructions.
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Pt100 relays

The Pt100 relays 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. If 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.