Carel WTS compact Manual Del Usuario página 36

ENG
The following problems can be found and solved with the following
procedures:
Problem
The fl ow rate of the permeate is not
the rated one. The demineralised
water quantity from the permeate
line is not enough.
The conductivity of permeate is too
high.
The conductivity meter of the
WTS Compact is not calibrated (on
ROC060 only).
The WTS Compact system never
starts or never stops.
Password 0077 does not work.
Please note that the logics of pressure switches on the equipment is the
following:
Pressure Logic Calibration Operating example
switch
Pump min. N.O. 1 bar
fl ow rate
Permeate N.C. 2 bar
min. fl ow rate
Permeate N.C. 4 bar
max. fl ow rate
"osmosi inversa" +0300017IE rel. 1.4 - 05.04.2018
Solution
- check that the feed fl ow rate is guaranteed and that there are not obstructions on the charge line. Check the conditions of
the inlet fi lters.
- check that the pressure generated downstream of the pump and reaching the membranes corresponds at least to 5-7 bar.
If necessary, close the by-pass tightening the screw (clockwise). Check that there are no leaks from junctions or pipelines.
- Check the drain line: the installed fl ow restrictor must generate a proper charge loss for generating pressure to the mem-
branes and thus for producing permeate. Check that the relationship between drain water and permeate is about unit (0.8
÷ 1.2). Replace the fl ow restrictor (if necessary).
- check that the membranes are not clogged and refer to the periodic maintenance sheets to check their conditions. In
standard conditions, the membranes have a gradual performance loss over time. If necessary, replace the membranes.
- fi rst of all, measure the conductivity of the feed water, because conductivity value at the outlet can always be compared
with the inlet one (90%-95% of salty rejection with new membranes).
- conductivity is the most signifi cant value but there are others to be taken into account: the reduction of TDS is extremely
important for evaluating the good conditions of the membranes and the good operation of the system.
- when the operating pressure of the membranes is higher, a higher fl ow rate of permeate is generated, with a higher con-
ductivity value. - check that the pressure generated downstream of the pump and reaching the membranes corresponds
approx. to 5-7 bar. If necessary, open the by-pass loosening the screw (anticlockwise).
- check that the membranes are not clogged and refer to the periodic maintenance sheets to check their conditions. In
standard conditions, the membranes have a gradual performance loss over time. If necessary, replace the membranes.
- remove the conductivity meter from its housing and clean the heads. Perform the measurement again.
- check the non-calibration of the conductivity meter on the equipment: to do so, you need to measure the conductivity
of the permeate with a second independent device. Make sure that the calibration of the second conductivity meter is
certifi ed.
- the conductivity meter on the equipment is calibrated following the standard factory procedure and this operation is not
easy to repeat. For a new calibration, proceed as follows: - arrange a buff er solution with known salinity (ranging between 0
and 100 μS), measured through an external device - remove the conductivity meter from its housing and keep it hanging,
still connected to the power line - enter the menu 2A ZERO CALIB - press ENTER to confi rm the value displayed in the
"lettura" box: in this way, the zero is calibrated - If the "lettura" box displays an irregular value, the display shows "ZERO cal
errata"; press ESC to quit without saving, then clean again the heads of the conductivity meter, or replace it. - enter the
menu 2B SLOPE CALIB - dip the conductivity meter in the buff er solution with known conductivity - wait until the "lettura"
value stabilises - press ENTER to save the measurement or press ESC to go back to the previous menu and quit. - if the
conductivity meter measures a conductivity value of the buff er solution extremely diff erent from the actual one (known),
replace the conductivity meter.
- the logic of the permeate pressure switches might have been entered in a wrong way: check on the display that status
N.C. corresponds to menus 5b and 6b.
- the pressure switch could be not calibrated. Check the calibration pressure by monitoring the behaviour of the WTS and
of the pressure switches during the vessel charging (check which is the pressure value that closes the contact) and during
the manual draining of the vessel (check at what pressure value the pressure switch opens the contact).
- check the operation of the pressure switches, possibly disconnecting the cables at the ends of the pressure switch, and
try to enable/disable the WTS opening the contact. If either pressure switch features an irregular operation, replace the
pressure switches.
Please note that the max. pressure switch for the permeate is calibrated at 4 bar and is placed in the high position. The min.
pressure switch for the permeate is calibrated at 2 bar and is placed in the low position.
- Try to enter "0000".
- If this password as well does not work, make a "RESET PASSWORD" procedure, restoring the default value "0000". Proceed
as follows: - disconnect power supply from the equipment - simultaneously press the buttons "UP" and "ESC" and recon-
nect power supply.
- For a few seconds the display shows "RESET PASSWORD" before going back to standard operation. The stored password
now is "0000".
- To confi gure a new password, access the menu 17 of the electronic controller.
>1 bar = closes equipment ON
<1 bar = opens equipment OFF
>2 bar = opens equipment OFF
<2 bar = closes equipment ON
>4 bar = opens equipment OFF
<4 bar = closes equipment ON
Tab. 4.c
16
Tab. 4.b