SECTION 7 DHL HEATLESS REGENERATIVE DRYER
45
Dryer does not
perform the
switching cycles.
• Solenoid valve PVA and/or PVB are never activated - see specific point.
• Inlet and/or outlet shuttle spool valve is blocked – carry out maintenance
• operations.
All the inlet air is
discharged through
the silencers.
• The dryer does not perform the switching cycles—see specific point.
• The solenoid valve PVA and/or PVB is blocked—open and clean it.
• The membrane of solenoid valve PVA and/or PVB is broken—carry out mainte-
nance operations.
• The SHDC-2100 Electronic controller always supplies solenoid valve PVA and/or
• PVB – verify the electric wiring and if necessary replace.
• The cycle times on the SHDC-2100 electronic controller have been changed—
restore nominal conditions.
• Regeneration nozzle is clogged—open and clean it.
Liquid comes out of
the silencers.
• Humidity in outlet air – see specific point.
LED
“HI PDP” of the
SHDC-2100 device
flashes or is on.
The probe of the DewPoint Meter (optional) detects a high DewPoint, for one of the following
reasons:
• Humidity at dryer outlet—see specific point.
• The air flow adjuster setting has been changed (see Section 6.14)—reset
nominal value.
• The selector valve of the operating tower (see Section 6.14) is blocked—
replace it.
• Verify the electric connection of the probe.
• The probe is not calibrated—contact the dealer.
• The probe is broken—replace it.
• There is an air leak on the pipes and/or joints that connect the equip-
ment— verify the connections and replace the damaged parts.
• A pipe or a joint which connects the equipment is clogged—replace it.
The LED
“FAIL TO SWITCH”
of the SHDC-2100
device flashes or is
on.
The pressureswitches(optional)forthe“FAILTOSWITCH”function,show an anomalous condi-
tions during the tower switching process, for one of the following reasons:
• The dryer does not run the switching cycle – see specific point.
• All the inlet air is purged through the silencers – see specific point.
• The solenoid valve PVA and/or PVB is never enabled – see specific point.
• The pressure switches are not calibrated – reset the default settings (see
Section 6.17).
• There is an air leak on the pipes and/or joints that connect the equipment
–verify the connections and replace the damaged parts.
• A pipe or a joint which connects the equipment is clogged – replace it.
PROBLEM POSSIBLE CAUSE - SUGGESTED ACTION
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