11. Corrective action
11.1. Faults during commissioning
Table 13: Faults during commissioning
RemedyDescription/causeFault
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.
In spite of correct setting of limit
switching, actuator operated into
the valve end position.
Exchange reduction gearing.Reduction gearing is not suitable for
turns/stroke of the actuator.
Measuring range 0/4 – 20 mA or
maximum value 20 mA at position
transmitter cannot be set or sup-
plies an incorrect value.
Call AUMA service.The LED on the EWG either flashes in setting
mode a) single flash or b) triple flash:
a) EWG is not calibrated.
b) Magnet positions of EWG are not aligned.
The measuring range 0/4 – 20
mA at EWG position transmitter
cannot be set.
Check setting, if required, reset end positions.
Refer to <Check switches> and replace the
switches if required.
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.
3. Turn test button [2] in direction of the TSO arrow: Torque switch OPEN trips.
The red indication light (fault) on the local controls is illuminated.
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.
45
SQ 05.2 – SQ 14.2/SQR 05.2 – SQR 14.2
AMB 01.1 Corrective action
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