Troubleshooting - Carel WTS compact Manual Del Usuario

Alarm Cause
STOPPED SYSTEM - The maximum pressure switch downstream of the
HIGH PRESSURE pump measures a pressure higher than the set
value (12 bar) (ONLY FOR ROC060)
STOPPED SYSTEM - The inlet minimum pressure switch measures a
LOW PRESSURE feed water pressure lower than the set value (0.8
bar) for a certain number of consecutive attempts
CHECK HI-LEVEL The contact opening/closing sequence for oper-
LOW-LEVEL CONTACTS ation authorisation (in the case of vessel fi lling/
draining) is incorrect
STOPPED SYSTEM - During the production phase, the conductivity
CONDUCTIVITY ALARM exceeds the set threshold for a certain period of
time (ONLY FOR ROC060)
MAINTAIN THE SYSTEM The time set for the scheduled maintenance has
expired.

4. TROUBLESHOOTING

Remedy
- check that the pressure switch is calibrated correctly and that the alarm actually
occurs when the set pressure is exceeded (12 bar, readable from the manometer
downstream of the pump)
- act on the pump by-pass to reduce the pressure downstream of the pump (sug-
gested value between 5 and 10 bar)
- use the menu 8C to set a specifi c delay in reading the maximum pressure switch
(5 seconds)
- If the problem persists, check that the permeate pipe is not obstructed and that the
produced fl ow is close to the nominal value.
- check that the water supply pipe upstream of the system has a suitable diameter
(at least 1/2")
- while reading the inlet pressure on the manometer, check that the supply water
pressure is guaranteed (both static pressure with WTS off and dynamic pressure with
WTS pump on).
- if there is a pressurisation pump upstream of the WTS, check that it operates cor-
rectly. If necessary, delay the WTS pump switching-on (menu 21A) of a few seconds
to allow the upstream pressurisation pump to activate.
- check the conditions of the inlet fi lters and the pressure loss caused by them (by
means of a pressure gauge upstream and one downstream of the fi lters). If neces-
sary, replace the fi lter cartridges and clean the inside of the vessels.
- check that the pressure switch is calibrated correctly and that the alarm actually oc-
curs below the set pressure (0.8 bar) Check whether the NC/NO logic of the contact
is implemented correctly (menu 7B, with reference to terminals 35-36). If necessary,
carry out a new calibration of the pressure switch.
- the authorisation to START is given by a minimum pressure switch (when the
pressure drops below 2 bar) or by a fl oat (which indicates the low level). The signal is
controlled by terminals 33-34 of the electronic board. Check that the authorisation to
START activates the signal (check that the signal is enabled in menu 5A; use a tester
to measure the terminal continuity at its ends) and that the signal logic (NC/NO)
complies with the one set in the display (menu 5B)
- STOP is given by a maximum pressure switch (when the pressure reaches 4 bar) or
by a fl oat (which indicates the high level). The signal is controlled by terminals 22-23
of the electronic board. Check that the authorisation to STOP activates the signal
(check that the signal is enabled in menu 6A; use a tester to measure the terminal
continuity at its ends) and that the signal logic (NC/NO) complies with the one set in
the display (menu 6B)
- Carry out an independent measurement of the produced water conductivity (for
example by means of an external conductivity meter)
- check that the conductivity meter on the machine operates correctly; if necessary,
clean the head and/or recalibrate the measuring instrument
- check the conditions of the membranes and monitor their performance deteriora-
tion over time
- check the supply water quality: the output conductivity always depends on the
quality of the supply water.
- correct the threshold value set in menu 3B if it is too low
- basically, the fi rst water produced after a period of inactivity will always have a
higher conductivity. It is advisable to increase the alarm delay by a time that can be
set in menu 3D
- if you want to ignore the alarm and you do not want to stop the normal operation
of the WTS, disable the Output Set Point in menu 3A
- reset the scheduled maintenance timer in screen 13B to the value set in menu 18B
- enable or disable the scheduled maintenance warning in screen 18A; use screen
18B to set the time before maintenance request
15 "osmosi inversa" +0300017IE rel. 1.4 - 05.04.2018
ENG
Tab. 4.a