SECTION 6 DHL HEATLESS REGENERATIVE DRYER
27
The correct operation of the dryer is controlled and
monitored constantly by the SHDC-2100 device. The
device carries out many functions:
1. It displays the operating status through the
Control panel LED panel;
2. It can be used to select the operating Dew-
Point;
3. It can be used to select the operating mode
(FIX, DPD and TEST);
4. It can be used to enable the “Energy Save”
function.
6.6 CONTROL PANEL
The Control panel LED panel is divided into four
different display area. Each one represents the
specific functions of the dryer, more precisely:
1. The LEDs on the left, positioned on the flow
diagram, represent the various operating
phases of the dryer.
2. The LEDs of the “Cycle mode” menu display
the operating mode of the dryer, selected by
the operator during the programming phase
(see Section 6.7).
3. The LEDs of the “Alarm” menu represent any
anomaly and/or malfunctioning of the
machine.
4. The LEDs and the DISPLAY on the right dis-
play the various load percentages the dryer
operates with.
The On/Off switch is located on the side of the
control box. Press the On/Off switch to power up the
control panel and energize the following LED. .
The LEDs on the flow diagram of the Control panel
show the operating status of the dryer, precisely:
1.At start up both the purge solenoid valves are
closed (for about 120 seconds) therefore the relevant
LEDs are off. The compressed air passes
through both drying towers, to pressurize the dryer
and therefore the LEDs are on.
2.After 120 sec. The dryer starts the first operating
cycle: “Phase A”, tower B is de-pressurized, LED
switches off and the PVB solenoid valve is
opened (LED
on) to vent the air used for the
regeneration.
3.Afterwards, the dryer starts the “Phase B” re-
pressurization of tower B, therefore solenoid valve
PVB shuts down (LED
off). LED
switches on when the pressure switch reaches the
calibration value (if the pressure-switch Kit is
installed– optional).
4.When the towers are once again pressure
balanced the second part of the cycle time starts with
“Phase C”, where tower A is de-pressurized, LED
switches off and the solenoid valve PVA is
opened (LED
on) to vent the air used for
regeneration.
5.The machine cycle ends with the re-pressurization
“Phase D” of tower A, the solenoid valve PVA closes
(LED
off). LED switches on when the
pressure switch reaches the calibration value (if the
pressure-switch Kit is installed–optional).
According to the selected operating mode (see Section 6.9) the following LEDs of the “Cycle mode” menu can be on:
Mode: FIX The dryer runs with fixed cycle times.
DewPoint under
pressure PDP :
-20°C
DewPoint under
pressure PDP :
-40°C
DewPoint under
pressure PDP :
-70°C
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