HygroMatik WL-ROL 160-1200 Series, Manual

Page: 38 / 76

Page 38
11. Control
The whole operation of the reverse osmosis
unit WL-ROL is controlled by a microproces-
sor.
The control-system enables the production
process and the control of the RO-unit. The
measured values are shown on a LC-display.
The control has the protection class IP65.
11.1 The control panel
The control panel is separated into three
zones:
• the 2 operating keys ESC, ENTER
• the 4 arrow keys
• LC-display
The operating keys are used to navigate
through the menus and submenus. The func-
tion of the keys is:
„ESC“: Cancel or return to the previous
level
Arrow keys: Move within a menu, a
submenu or a selection list
„ENTER“: Acceptance and storage of a
selected setting
By pressing the arrow keys
you can call up the read values:
• Permeate conductivity
• Operating hours
• Remaining time (hours) until the next
service
Access to the main menu:
» press or about 2 sec, the dis-
play shows “PASSWORD 0000“
» enter the password using the arrow
keys (0077)
» confirm with
The control system regulates the automatic
sequence for start-up, production, process
shut-down, as well as for periodic rinses by
controlling the following actuators:
• Feed water valve (V
FEED
)
• Permeate flush valve (V
PER
)
• High pressure pump (P
HP
)
• Dosing pump Antiscalant (P
ASC
)
• Fault signal/alarm (potential-free
changeover relay)
The controller is equipped with the following
digital inputs for monitoring the process:
• Overpressure switch (PS
HIGH
)
• Low pressure switch (PS
LOW
)
• Level of permeate vessel low (PS
Min
)
• Filling level permeate vessel full ( PS
MAX
)
• External stand-by signal (IN
SB)
• Error dosing pump antiscalant (IN
PASC
)
• Malfunction feed water pre-filter (IN
FIL
)
Furthermore, the controller has a conductivity
measurement (not temperature compen-
sated) for monitoring the permeate quality,
with a freely adjustable limit value.
This means that the unit is switched off and a
fault message is output if the limit value of the
permeate conductivity is exceeded during
operation.