EN
| User Manual
Identify and eliminate faults
42
KE-MT 120-600
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
Component
PI
Pressure gauge
V1 (Y2–Y1)
Main inlet valve (solenoid valves)
V2–V3
Check valves
V4–V5 (Y3–Y4)
Expansion valves (solenoid valves)
RV1–RV2
Check valves of regeneration gas return line (optional)
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
Possible cause
Remedy
Specialised
personnel
Service
technician
Excessive dam pres-
sure during regener-
ation
Muffl er or fi lter element of
the muffl er is contaminated.
Check muffl ers or fi lter
elements for contamination,
clean if nec., and poss.
renew.
•
•
Expansion valve V4/V5 does
not open correctly.
Check expansion valve for
contamination, if nec. renew
gaskets.
•
•
Dust sieves are contami-
nated.
Clean or renew dust sieves.
•
•
Vessel pressure is too
low
Excessive differential pres-
sure on the upstream fi lter
(option).
Check differential pressure
on the upstream fi lter, if.
nec. renew fi lter element.
•
No pressure build-up
The compressed air system
upstream of the dryer is not
pressurised.
Check whether the
compressed air system
upstream of the dryer is
pressurised. Remove any
faults.
•
Solenoid valve Y3/Y4 does
not close.
Check supply voltage, ca-
ble, contacts and solenoid;
replace, if necessary.
•
•
Expansion valve V4/V5 does
not close.
Check gaskets for contami-
nation, if nec. clean/renew.
•
•
