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Section 3: General
User Instructions
MAN-02-04-60-0351-EN Rev. 3
Febraury 2019
General
3.6
Protective Devices
3.6.1 Torque
Bettis RTS FQ Fail-Safe Quarter-Turn actuators provide electronic torque monitoring.
The switch-off torque can be modified in the controller menu for each direction separately.
By default, switch-off torque is set to the ordered value. If no torque was specified with the
order, the actuator is supplied from the factory with the maximum configurable torque.
For more information, see Section 8.1.
3.6.2 Motor Temperature
All ACTUSMART CM actuators are normally equipped with motor winding temperature
sensors, which protect the motor against excessive winding temperature.
The display will show the corresponding error upon exceeding the permissible motor
temperature, see Section 13.1.
3.6.3 Input Fuse, Thermal Fuse
The frequency inverter is protected by an input fuse and the explosion proof version by a
thermal fuse. If one of the fuses releases, a serious defect occurs and the frequency inverter
must be replaced.
3.7
Ambient Temperature
Unless otherwise specified upon ordering, the following operating temperatures apply:
•
On/Off duty (open-loop control) -25 to +60C
•
Modulating duty (closed-loop control) -25 to +60C
•
Explosion-proof version -20 to +40C (acc. EN 60079-0)
•
Explosion-proof version with extended temperature range -40 to +60C