KSB EA-C, Installation & Operating Manual, Page: 29 / 44

8 Trouble-shooting
29 of 44
EA-C
Table 9: Trouble-shooting for faults in the actuator's environment
A B C D E F G H Faults in the actuator's
environment
Possible cause Remedy
- -
✘
-
✘
- - - An excessive torque has been
measured when the actuator
is run to its limit positions.
Actuator has not been
initialised correctly for the
valve actuated. Repeat initialisation
procedure.
Actuator stroke is blocked
mechanically. Check valve and actuator for
smooth operation.
Incorrect actuator selection Verify actuator selection.
- -
✘
- -
✘
- - No or incorrect actual process
value signal
Maximum control range is
exceeded.
No or incorrect actual process
value signal Apply correct actual process
value signal, check polarity of
actual process value signal.
Actual process value not
within set range Ensure correct actual process
value.
No signal provided by process
sensor. Check process sensor or power
supply.
- - ✘ - - - ✘ - Actuator moves to a pre-set
position.
A signal has been applied to
the fail-safe binary input. Disconnect signal.
Mains power failure on
actuator options with
rechargeable battery pack
(Accupack) Check power supply.
- - ✘ - - - - ✘ Setpoint signal not applied or
not within set range Setpoint signal not applied Apply setpoint signal.
Wrong polarity of setpoint
signal Check polarity of setpoint
signal.
Setpoint signal not within the
set range Check setpoint range.
-
✘
- -
✘
- - - The limit position stored
during initialisation has not
been reached.
Dirt deposits on valve seat or
loosened valve seat Check valve seat.
- ✘ - - - ✘ - - The limit position stored
during initialisation has been
exceeded.
Worn or defective valve seat Check valve seat.
-
✘
- - - -
✘
- Insufficient supply voltage in
the actuator
Incorrect mains connection Check mains connection.
Supply voltage fluctuations Check power supply. See data
sheet
Insufficient voltage supplied
by rechargeable battery (on
actuator options with
"accupack" rechargeable
battery pack) Contact KSB Service.
Table 10: Trouble-shooting for actuator faults
A B C D E F G H Actuator faults Possible cause Remedy
✘
- - -
✘
- - - Actuator has reached service
limit.
Wear and/or operating hours Contact KSB Service.
✘
- - - -
✘
- - Electronics fault/Invalid
parameter data
Power supply has been
interrupted during
initialisation. Contact KSB Service.
Damaged electronic
component
✘ - - - - - ✘ - Critical or maximum actuator
temperature has been
reached.
Excessive frequency of starts Check control settings.
Ambient temperature too
high Check ambient temperature
and reduce if possible. See
data sheet
✘ - - - - - - ✘ Mechanical actuator fault Damaged mechanical
component Contact KSB Service.