Operating instructions AutoFilt
®
RF4 English
BA RF4-Standard-deutsch/ englisch/ französisch 01/2007 HYDAC-Document: 03191177f Page 34
Fault Fault source Cause Action
Continuous back-
flushing
Differential pressure
trigger point
Setting (optional) of
the differential
pressure trigger point
is too low
Check the setting of the differential pressure
trigger point, see section 4.4
If necessary, increase this pressure (optional)
Pressure differential
between filtrate/back-
flushing line
Pressure differential
between filtrate outlet
and back-flushing line
is too low, filter
elements are not
completely cleaned.
- Increase pressure at the inlet.
- Reduce pressure of back-flushing line.
Note the specifications in Section 5.2.
Filter elements Filter elements are
permanently
contaminated
- Stop the back-flushing filter, see Section 6.2.2
– Remove filter elements, see Section 7.4.1.
– Clean filter elements with high-pressure
cleaner. If the filter elements cannot be cleaned
or are damaged,
→ fit new filter elements.
– Insert filter elements, see Section 7.4.2
Fitting the filter elements
Shut-off valve does
not open
Compressed air
supply of the
pneumatic actuator is
not connected
- Set up compressed air supply
– Compressed air supply min. 4,5 bar max.
8 bar
Solenoid valve is not
connected to the
control unit
Check whether the solenoid valve is supplied
with power in the flush setting.
If yes: Check function of the solenoid
valve and replace if necessary.
If no: Check connector and power
cable and replace if necessary.
Actuator defective Replace actuator
Table 8: Troubleshooting - back-flushing filter
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