Operating instructions for actuators type AB with SMARTCON control unit
OM-ENGLISH-CSC-V2.08-2019.11.07 2 General
2.7 Protection devices
2.7.1 Electromechanical protection devicesn
The torque protection of the actuators with integral SMARTCON control unit is controlled mechanically by plate
springs which pass the current torque through a conductive plastic potentiometer to the control unit.
The switch off torque can be changed in the menu of the control unit for the left and right direction. The factory
default switch off torque is set to the ordered torque. If no torque was specified in the order, the actuator is
supplied from the factory with the maximum adjustable torque.
See also section 7.2, page 25
2.7.2 Electrical protection devices
All motors have temperature switches as standard equipment (temperature sensors upon special order), which
are wired into the control and protect the motor from overheating.
In the housing of the connection plug super fast safety fuses are located the protect the integrated thyristors
(electronic reversing contactors).
Further we recommend the installation of a motor protection circuit breaker on site as additional protection for
rapid engine warming up (block). The tripping current must be adjusted to 1.2 . . . 1,5-times of the motor current,
or at explosion-proof models proceed according to the corresponding guidelines of the National Explosion
Protection Authority.
2.8 Ambient temperature
Unless otherwise defined according to special order, the following operational temperature generally applies:
• open-loop control actuators from -25
◦
C to +70
◦
C
• closed-loop control actuators from -25
◦
C to +60
◦
C
• Explosion-proof actuators from -20
◦
C to +40
◦
C (according to EN60079-0 Standard).
Warning: The maximum operational temperature also depends on the built-in components. Please observe
the technical data sheets.
2.9 Delivery condition of the actuators
For each actuator, an inspection report is generated upon final inspection. In particular, this comprises a full
visual inspection, calibration of the torque measurement in connection with an extensive run examination and
a functional test of the micro controllers.
These inspections are conducted and documented according to the quality system and can be found in the
document gag (mounted on the handwheel).
The basic setting of the end position must be performed after assembly on the actuator.
CAUTION: Commissioning instructions (see section 5, page 12) must be strictly observed!
During assembly of the supplied valves at the factory, end postions are set and documented by
attaching a label (see Figure 9).During commissioning at the plant, these settings must be verified.
Figure 9: Label
7
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