4.5 Interlock circuit for the external fan
Interlock circuit for the external fan motor
For machines with external fans, install an interlock circuit that prevents the main machine
being switched on if the external fan is not operational.
See also
Auxiliary circuits (Page 75)
Force-ventilated 1PH818. and 1PH822. motors are equipped with electronically commutated
motors (EC motor).
NOTICE
Voltage fluctuations
The electronics of the external fan equipped with EC motor can be damaged as a result of
voltage fluctuations. Supply the external fan with power from the line supply and not via a
frequency converter.
4.6 Interlock circuit for anti-condensation heating (option)
If the anti-condensation heating is operated while the machine is running, this can increase
the temperatures inside the machine.
● Install an interlock circuit that switches off the anti-condensation heating once the main
machine is switched on.
● Only switch on the anti-condensation heating after the motor has been switched off.
Carefully comply with the data on the anti-condensation heating plate.
See also
Switching on the machine (Page 94)
4.7 Thermal motor protection
The machine is equipped as standard with a temperature sensor, optionally with PTC
thermistors to directly monitor the motor temperature in order to protect the machine against
overload in operation. Plan a corresponding circuit for monitoring.
See also
Connecting the temperature sensor (Page 80)
Preparations for use
4.7 Thermal motor protection
SIMOTICS M-1PH8 1PH818., 1PH822.
Operating Instructions 07/2016 33
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