Implementing a motor thermal protection circuit 21
Connection diagram (one-channel connection)
The diagram below shows the wiring of the one-channel connection. The system
integrator must acquire the components and do the installations drawn outside the drive
border line.
1)
An ATEX-compliant protection relay. The relay monitors a sensor circuit, and de-energizes the FSO module
input by opening the control circuits when necessary.
2)
Connect to a digital input on the control board for the protection relay status indication. In this example,
digital input DI6 is in use.
In this one-channel connection, there is no redundant connection between the protection relay and FSO
module. Still, the STO connection signal between the FSO module and STO circuit is redundant.
When you install the equipment, make sure that you maintain separation of the switching (safety) signal with
any other signals.
Sensors
Make sure that the sensor type and the on-off resistances of the used sensors match with
the protection relay specifications. Check the requirements for sensors and installation
from the documentation of the protection relay to be used.
Control
circuit
ACS880
3
3
3
~
Ex
motor
Protection relay
1)
24 - 240 V AC / DC
Sensor
Potentially explosive
atmosphere
XSTO
FSO
1
2
3
4
1 234 1 2
24 V / 1 A
X111 X112
X110
X112
1 234…10
1 234…10
X113
X114
2)
DI6
+24VD
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