11.
Corrective action
11.1.
Faults during commissioning
Table 14: Faults during commissioning
Remedy
Possible causes
Fault description
Exchange reduction gearing.
Reduction gearing is not suitable for
turns/stroke of the actuator.
Mechanical position indicator
cannot be set.
Determine overrun: Overrun = travel covered
from switching off until complete standstill.
Set limit switching again considering the
overrun (turn handwheel back by the amount
of the overrun).
The overrun was not considered when setting
the limit switching.
The overrun is generated by the inertia of
both the actuator and the valve and the delay
time of the controls.
Fault in end position
Actuator runs to end stop al-
though the limit switches work
properly.
Check setting, if required, reset end positions.
→
Check switches and replace them, if re-
quired.
Switch is defective or switch setting is incor-
rect.
Limit and/or torque switches do
not trip.
Switch check
The red test buttons [1] and [2] are used for manual operation of the switches:
1.
Turn test button [1] in direction of the TSC arrow: Torque switch CLOSED trips.
The red indication light (fault) on the local controls is illuminated.
2.
Press push button OPEN to reset the fault (indication light) by operating the
device in the opposite direction.
3.
Turn test button [2] in direction of the TSO arrow: Torque switch OPEN trips.
4.
Press push button CLOSE to reset the fault (indication light) by operating the
device in the opposite direction.
If the actuator is equipped with a DUO limit switching (option), the intermediate
position switches (LSA and LSB) will be operated at the same time as the torque
switches.
1.
Turn test button [1] in direction of the LSC arrow: Limit switch CLOSED trips.
2.
Turn test button [2] in direction of the LSO arrow: Limit switch OPEN trips.
11.2.
Fuses
11.2.1.
Fuses within the actuator controls
After removal of local controls, the fuses can be accessed.
Hazardous voltage!
Risk of electric shock.
→
Disconnect device from the mains before opening.
52
SQEx 05.2 – SQEx 14.2 / SQREx 05.2 – SQREx 14.2
Corrective action
AMExC 01.1
Summary of Contents for AMExC 01.1
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