DHL HEATLESS REGENERATIVE DRYER SECTION 6
38
6.12 MAINTENANCE (SERVICE)
The adsorption dryer requires a periodical
maintenance which, in the proposed configuration,
entails the replacement of the inlet and outlet filter
and of the desiccant material. Through DIP D5 it is
possible to choose the foreseen use of the machine:
on OFF up to 3000 hours/year, on ON over 3000
hours/year.
The SHDC-2100 device will then count the number
of working hours and will engage the maintenance
alarms, or better reminders, when certain values are
reached. See Table 6-4:
6.13 FUSES
Three different safety fuses are fitted on the
electronic board, in positions F1, F2 and F3. the
fuses protect the following circuits:
F1 = (2A type ) → main power;
F2 = (1A type ) → Condensate drain solenoid valve;
F3 = (0.5A type) → control Logic.
The fuses can fail if there are any
problems with the dryer. In this case,
replace them, after solving the problem
that caused the malfunctioning. Also
refer
Section 7.2: TROUBLESHOOTING on page 44”.
6.14 DEWPOINT METER—
(OPTIONAL)
The SHDC-2100 device has an analog input 4-20mA
which the DewPoint meter is connected to (PDP
Meter) and a sampling system.
By installing the DewPoint meter it is possible to :
• Show the Dew Point value on the display of
the SHDC-2100 device;
• Enable the operation of the dryer in DPD
mode (see
Section 6.10.2);
• Enable the HI PDP alarm (see v).
The sampling system includes a cell (Pos. 2) which
holds the DewPoint meter’s sensor (PDP Meter). A
constant flow of compressed air must flow through
the cell (about 2 liters/minute), taken from the
operating tower. The selector valve (Pos. 1) is used
to choose the operating tower from which to take the
air to be measured. The quantity is controlled by the
air flow adjuster (Pos. 3).
The sampling system includes a cell (Pos. 2) which
holds the DewPoint meter’s sensor (PDP Meter). A
constant flow of compressed air must flow through
the cell (about 2 liters/minute), taken from the
operating tower. The selector valve (Pos. 1) is used
to choose the operating tower from which to take the
air to be measured. The quantity is controlled by the
air flow adjuster (Pos. 3).
Table 6-4: Maintenance Schedule
DIP D5 = OFF
DIP D5 = ON
Alarm
Following
Reminder
Alarm
Following
Reminder
Filter IN
Every 3000 hours
Every 600 hours Every 4000 hours Every 800 hours
Filter OUT
Desiccant Material Every 9000 hours
Every 1000 hours Every 12000 hours Every 1500 hours
The maintenance alarms (reminder) do not change in any way the operation of the SHDC-2100 device.
1. Working tower selector valve
2. Sampling cell with DewPoint meter
3. Air flow adjuster
Figure 6-8: DewPoint Meter layout
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