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Instruction book
5 PROBLEM SOLVING
The chart below helps to solve non-electrical faults.
Warning: Before starting any repair work on the dryer, make
sure that the circuit breaker(s) (F41, Q2 and Q41-
Figs. 1.9 up to 1.15) are in the "0" position and
that the dryer is depressurized. An electrical fault
must be traced by an electrician. Make sure that
the wires are not chafed, damaged or broken and
that they are clamped tight to their terminals.
Possible faults and their remedies
Explanation about the table below:
- Conditions of the dryer, always preceded by a number, are
printed in bold.
- Each possible fault is followed by its related suggested
remedy and both are preceded by the same letter.
1 Pressure dewpoint too high
a Compressor loading periods repeatedly too short
a Take necessary action to increase duration of loading periods
b Incorrect pressure difference between dryer compartments
b Check pressure difference which should be within the range
specified in section 3.1, step 14. Never operate the dryer
with a pressure difference beyond the specified range.
Always be sure that the connections of the U-tube are airtight
c Operating pressure too low
c Do not operate dryer at a pressure less than 4 bar(e) (2.5
bar(e) for dryers connected to a ZE compressor)
d Rotor does not turn
d Consult Atlas Copco
e Rotor compartment sealing ring, sealing sectors and rotor
need inspection
e Consult Atlas Copco
f Aftercooler air outlet temperature too high
f On water-cooled compressors, check cooling water inlet
temperature and increase water flow. If temperature cannot
be decreased sufficiently, consult Atlas Copco
On air-cooled compressors, clean cooler externally. If
temperature cannot be decreased sufficiently, consult Atlas
Copco
g Regeneration cooler air outlet temperature too high
g See 1f
h Regeneration cooler air outlet temperature too low
h Consult Atlas Copco
i Drain system malfunctioning
i Inspect system and replace parts where necessary
2 Dryer air inlet temperature is higher than aftercooler
air outlet temperature
a Regeneration cooler air outlet temperature too high
a On water-cooled dryers, increase water flow through
regeneration air cooler
On air-cooled dryers, clean cooler externally
b On water-cooled dryers, cooling water temperature too
high
b Arrange so as to decrease temperature
c Regeneration cooler clogged internally
c Consult Atlas Copco
3 Only on water-cooled dryers, water flows from one or
both electronic water drains during unloaded operation
and after dryer has been stopped
a Regeneration air cooler core tube broken
a Remove cooler, plug broken tube or replace cooler core
4 Regeneration air inlet temperature too low
a Compressor loading periods too short
a See 1a
b Nozzle of ejector partly obstructed
b Remove and clean nozzle. Investigate cause
c Compressor does not operate properly
c Consult section "Problem solving" of compressor instruction
book
5 LEDs of electronic water drain do not light up
a Power supply to EWDs faulty
a Check power supply. Compare power supply with voltage
mentioned on data label of EWD
b Power supply board defective
b Check and replace as necessary
6 No condensate discharged when pressing test button on
EWD
a Condensate inlet and/or outlet blocked
a Check and correct as necessary
b Control board defective
b Check and replace if necessary
c Solenoid valve defective
c Check and replace if necessary
7 Condensate only discharged when test button is pressed
a Sensor dirty
a Clean sensor
b Air pressure below minimum pressure
b Increase air pressure
8 EWD continuously discharges air
a Control air blocked
a Check and correct as necessary
b Sensor dirty
b Clean sensor
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