Implementing a Safe disconnection function 17
Connection diagram (two-channel connection)
The diagram below shows the wiring of a two-channel connection. The system integrator
must acquire the components and do the installations drawn outside the drive border line.
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 sensor and installation from
the documentation of the thermistor relay to be used.
Protection relay
The protection relay monitors the motor equipped with temperature sensors. The sensor
indicates the motor temperature for the protection relay. For example, with a PTC
thermistor, when the motor temperature reaches the wake-up level of the sensor, the
*
You can use the drive STO function for several external safety functions at the same time (for example,
ATEX-compliant thermal motor 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 ATEX-complaint protective
relay.
In two-channel installations, when you install the equipment, make sure that you maintain redundancy (sep-
aration) of switching signals.
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