DHL HEATLESS REGENERATIVE DRYER SECTION 7
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7.2 TROUBLESHOOTING
The troubleshooting and the eventual checks have to be performed by qualified personnel.
We suggest enabling the TEST modality to make troubleshooting operations easier
(see
Section 6.11) and gradually verify that the operating steps are performed correctly.
Maintenance personnel must wear hearing protection while operating the dryer. Each employee must
select proper PPD (Personal Protection Device) hearing protector (earmuffs, ear canal caps and ear-
plugs) in order to prevent any discomfort or damage to the operator’s hearing..
PROBLEM POSSIBLE CAUSE - SUGGESTED ACTION
Humidity in outlet
air.
• The dryer is off—switch it on.
• The dryer has just been started up and the adsorption material can contain humid-
ity—use the dryer at a reduced nominal flow of 50% for at least 2 days and verify
the correct operation of the machine.
• The dryer does not perform the switching cycles—see specific point.
• The inlet air is too hot - restore the nominal conditions.
• The inlet air pressure is too low—verify that the installed regeneration nozzle is for
the real working pressure of the dryer. If you have doubts or problems, please con-
tact your distributor.
• The inlet air flow rate is higher than the rate of the dryer—reduce the flow rate
—restore the nominal conditions.
• Inlet filter does not drain the condensate—check the proper operation of the
drainer.
• Electronic timer of the inlet filter drainer is not adjusted correctly—reduce the drain
pause time.
• The pressure gauge of the tower under regeneration shows a pressure higher than
0—silencers are clogged—clean or replace them.
• Cycle time on SHDC-2100 Electronic Controller has been modified—restore the
nominal times.
• Desiccant material is exhausted—replace.
Solenoid valve PVA
and/or PVB are
never activated.
• Check for electrical supply or on/off switch failure.
• Verify the electric wiring.
• Verify fuses on SHDC-2100 Electronic Controller.
• The valve is blocked—open and clean it.
• The coil of the solenoid valve burned out—replace it.
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