EKOM DK 50 4X2VT/M, User Manual

Page: 38 / 60

AD DRYER
NP-DK50-Nx2VTM-ADM-EN-1_06-2022 38 06/2022
AD DRYER
18. PRINCIPLE OF OPERATION
The dryer is controlled by a signal from the
compressor pressure switch.
When the compressor is running, compressed
air enters the cooler where it is cooled, and a
portion of the condensed moisture is
separated in the integrated cyclical separator.
Solenoid valve V3 is located in the bottom of
the separator, and it drains off the condensate
from the separator at regular intervals.
Air then passes to the chamber of logic valve
OR1 which senses the pressure. If the
pressure in the valve chamber does not reach
P1 = 3 bar, regeneration solenoid valves V1
and V2 (normally closed type) remain closed
and regeneration is not initiated. If the
pressure in the chamber of the logic valve
reaches minimum3 bar, chamber switching is
initiated using the logic described in point
18.1.
When the signal from the compressor
pressure switch deactivates, regeneration
valves V1 and V2 open for a short time to vent
the compressor aggregate and to vent the
dryer chamber.
Dryer venting and regeneration is completed
via the hose shared with the condensate
separator drain and for this reason the
condensate outlet cannot be connected
directly to a drain
18.1. Dryer regeneration
Dryer regeneration is initiated when working
pressure P1 = 3. During regeneration, valves
V1 and V2 switch cyclically, whereby there is
a short delay (dT) to equalise the pressures in
the chambers and during which both valves
are closed before each switching cycle.
Working pressure is in chamber 1 and the
chamber is in the drying phase, while there is
atmospheric pressure in chamber 2 and this
chamber is in the regeneration phase. The
chamber is regenerated by air passing
through the dryer nozzle.
18.2. Waring system
Every warning is indicated by a corresponding
visual signal (see Chapter 21) and the visual
signal flashes. Call an authorised service
provider to conduct repairs required in the
event of a failure.
Warning states indicate a potential failure of
the device. Therefore, warning signals may
not be deactivated.
All warning signals are intermittent
– when the
cause of the warning no longer exists, the
warning signals are deactivated.
Operator’s position. No specific operator’s
position is required. The operator may remain
within range of a visual warning signal
depending on actual operating conditions.
Low pressure . This signal is active when the
dryer pressure sensor reads low pressure in
the dryer under the defined limit of 3 bar. An
air
leak from the compressor/dryer,
malfunction of the control solenoid valves on
the dryer or a software error may activate this
alarm during operation.
High pressure . This signal is active when the
dryer pressure sensor reads an increase in
pressure over the high limit. The aggregate
will then shut down and remain shut-down
until the pressure decreases. If the aggregate
does not shut down, excess pressure is
vented
by the safety valve on the
compressor’s air tank.
High dew point . This signal is active when
the dew point sensor reads a high dew point
value.
Expiration of service interval . This signal is
activated until service is performed and the
interval reset, or a new service interval is
entered.