23.2 Motor protection
In order to protect against overheating and impermissibly high 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 red indication light 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 after the motor has cooled down.
As soon as the actuator receives a operation command (OPEN - CLOSE),
the fault signal (red indication light) is no longer illuminated.
Version with thermoswitch and additional thermal overload relay
within the controls (option):
The operation can only be continued after the fault signal (red indication
light) has been reset. The fault signal is reset via the overload relay inte-
grated in the actuator controls. Therefore the controls has to be opened at
the cover (15.0 page 56) and the relay held down. The relay is located on
the contactors (4.1).
Version with PTC thermistor (option)
The operation can only be continued after the fault signal (red indication
light) has been reset. The fault signal is reset via selector switch position
RESET (figure 59) of the local controls.
49
Multi-turn actuators SA 07.1 – SA 30.1/SAR 07.1 – SAR 30.1
Operation instructions
with actuator controls AUMA MATIC AM 01.1/AM 02.1
Figure 59: Selector switch RESET
