12.2.3. Motor protection (thermal monitoring)
In order to protect against overheating and impermissibly high surface temperatures
at the actuator, PTC thermistors or thermoswitches are embedded in the motor
winding.The thermoswitch is tripped as soon as the max. permissible winding
temperature has been reached.
The actuator is stopped and the "collective fault" indication light (option) on the local
controls is illuminated.
The motor has to cool down before the operation can be resumed.
Version with thermoswitch (standard)
The actuator can be controlled again once the motor has cooled down ("collective
fault" indication light goes out).
Version with thermoswitch and additional thermal overload relay in actuator
controls (option)
The operation may only be resumed once the fault signal ("collective fault" indication
light) has been reset.The fault signal is reset via the overload relay integrated in the
actuator controls.Therefore, actuator controls have to be opened at the cover and
the relay held down.The relay is located on the contactors.
Version with PTC thermistor (option)
The operation may only be resumed once the fault signal ("collective fault" indication
light) has been reset.The fault signal is reset via selector switch position Reset of
the local controls.
Figure 69: Selector switch on local controls
69
SA 25.1 – SA 48.1 / SAR 25.1 – SAR 30.1
AM 02.1 Corrective action
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