11.
Corrective action
11.1.
Faults during commissioning
Table 21:
Faults during operation/commissioning
Remedy
Description/cause
Fault
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 switches off until complete standstill.
●
Set limit switches again considering the over-
run. (Turn handwheel back by the amount of
the overrun)
The overrun was not considered when setting the
limit switches.
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 mechani-
cal limit switching, actuator operates
into the valve or actuator end position.
●
Connect link across RWG to XK (terminals
23/24)
●
Connect external load to XK, e.g. remote indi-
cation.
●
Observe maximum load R
B
.
Current loop across RWG is open.
(Position feedback 0/4 – 20 mA is only possible if
the current loop is closed across the RWG.)
No value can be measured at measur-
ing points of the RWG.
Exchange reduction gearing.
Reduction gearing is not suitable for turns/stroke
of the actuator.
Measuring range 0/4 – 20 mA or
maxi- mum value 20 mA at position
transmitter cannot be set or supplies
an incorrect value.
Call 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 incorrect.
Limit and/or torque switches do not
trip.
Dismount handwheel. Replace overload protection
and remount handwheel.
Actuator in version with overload protection for
manual operation: Shear pin rupture due to exces-
sive torque at handwheel.
Handwheel rotates on the shaft with-
out transmitting torque.
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.
2.
Turn test button [2] in direction of the TSO arrow: Torque switch OPEN trips.
If the actuator is equipped with DUO limit switches (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.
Motor protection (thermal monitoring)
In order to protect against overheating and impermissibly high temperatures at the
actuator, thermal switches are embedded in the motor winding. They trip as soon
as the max. permissible winding temperature has been reached.
Behavior during failure
If the signals are correctly wired within the controls, the actuator is stopped and can
only resume its operation once the motor has cooled down.
55
SAEx 25.1 – SAEx 35.1 / SAREx 25.1 – SAREx 30.1
NORM (without controls)
Corrective action
