Protection Devices; Mechanical Protection Devices; Electrical Protection Devices; Ambient Temperature - SCHIEBEL AB3 Operating Instructions Manual

Operating instructions for actuators type AB
OM-ENGLISH-AB-V2.05-2017.06.28

1.6 Protection devices

1.6.1 Mechanical protection devices

All actuators have at least one torque switch for clockwise and counter-clockwise rotation. These can be sep-
arately adjusted and are preset ex works to the torque required
The adjusting screws are varnish-protected and must not be reset without prior consultation
with the Schiebel Company.
However, the torque for the relevant rotating direction can be reduced by means of plastic cams on
the torque switch. Counter-clockwise rotation torque is reduced as follows: Using a screwdriver, turn the plastic
cam marked "L"in the direction of the decreasing scale markings (clockwise).
To reduce the clockwise rotation torque, turn the plastic cam marked "R"in the direction of the decreasing scale
markings (clockwise). See Figure 5.

1.6.2 Electrical protection devices

All motors have temperature switches as standard equipment (temperature sensors upon special order), which
protect the motor from overheating, if properly wired (see proposed wiring diagram).
WARNING: Please observe the technical data sheet of the built-in electrical components.
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.

1.7 Ambient temperature

Unless otherwise defined according to special order, the following operational temperature generally applies:
open-loop control actuators from -25 C to +80 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.

1.8 Delivery condition of the actuators

For every actuator, a test record is drawn up at the final quality control, during which a 100% optical inspection
as well as an adjustment of the shutdown torque and a functionality test of the built-in components are carried
out.
Adjustment of the travel switch including any ordered supplementary elements must be done after installation
on the positioning element.
Warning: The start-up instructions (see Section 4, page 11) absolutely must be followed!
If mounting on a provided valve at our company, the electrical components will be preset and this
will be documented by attaching a sticker (see Figure 6) on the indicator lid. On start-up resetting
could be necessary.
Figure 5
1 Introduction/Notes
5