16 Implementing a motor thermal protection circuit
Connection diagram
The diagram below shows the connections. 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 activates the STO function of
the drive by opening the control circuits when necessary.
2)
You can use the drive STO function for several external safety functions at the same time (for example,
ATEX-compliant motor thermal protection and emergency stop). If you do, you must connect the STO
activation switches or relays used in other safety functions in series with the protection relay.
When you install the equipment, make sure that you maintain separation of the switching (safety) signal with
any other signals.
ACS880
33
3
~
Ex
motor
3
~
supply
Protection relay
1)
24 - 240 V AC / DC
Sensor
Potentially explosive
atmosphere
3
4
+24 V
Control
circuit
XSTO
1
2
3
4
2)
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