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EN | User Manual
Identify and eliminate faults
The following table provides information on what designatory abbreviations are to be used for
the various components. These designations are also found in the technical documentation.
Used abbreviation
PI
V1 (Y2–Y1)
V2–V3
V4–V5 (Y3–Y4)
RV1–RV2
Summary of faults
There are different fault types. In the case of most electrically caused faults (e.g. short circuit,
defective fuse, etc.) the expansion valve closes and the regeneration is interrupted. In the
case of some process faults, the dryer will continue to operate for some time. Other faults on
the dryer become noticeable e.g. due to unusual noises and ran pressures.
The following table shows who is allowed to remedy a fault: the owner's specialist personnel
or the manufacturer's service engineer.
Table of possible faults
Fault
Excessive dam pres-
sure during regener-
ation
Vessel pressure is too
low
No pressure build-up
42
Component
Pressure gauge
Main inlet valve (solenoid valves)
Check valves
Expansion valves (solenoid valves)
Check valves of regeneration gas return line (optional)
Possible cause
Muffl er or fi lter element of
the muffl er is contaminated.
Expansion valve V4/V5 does
not open correctly.
Dust sieves are contami-
nated.
Excessive differential pres-
sure on the upstream fi lter
(option).
The compressed air system
upstream of the dryer is not
pressurised.
Solenoid valve Y3/Y4 does
not close.
Expansion valve V4/V5 does
not close.
Identify and eliminate faults
Remedy
Check muffl ers or fi lter
elements for contamination,
clean if nec., and poss.
renew.
Check expansion valve for
contamination, if nec. renew
gaskets.
Clean or renew dust sieves.
Check differential pressure
on the upstream fi lter, if.
nec. renew fi lter element.
Check whether the
compressed air system
upstream of the dryer is
pressurised. Remove any
faults.
Check supply voltage, ca-
ble, contacts and solenoid;
replace, if necessary.
Check gaskets for contami-
nation, if nec. clean/renew.
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KE-MT 120-600
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