15
ENG
"osmosi inversa" +0300017IE rel. 1.3 - 12.10.2016
4. TROUBLESHOOTING
Alarm Cause Remedy
STOPPED SYSTEM -
HIGH PRESSURE
The maximum pressure switch downstream of the
pump measures a pressure higher than the set
value (12 bar) (ONLY FOR ROC060)
- 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.
STOPPED SYSTEM -
LOW PRESSURE
The inlet minimum pressure switch measures a
feed water pressure lower than the set value (0.8
bar) for a certain number of consecutive attempts
- 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.
CHECK HI-LEVEL
LOW-LEVEL CONTACTS
The contact opening/closing sequence for oper-
ation authorisation (in the case of vessel fi lling/
draining) is incorrect
- 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)
STOPPED SYSTEM -
CONDUCTIVITY ALARM
During the production phase, the conductivity
exceeds the set threshold for a certain period of
time (ONLY FOR ROC060)
- 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
MAINTAIN THE SYSTEM The time set for the scheduled maintenance has
expired.
- 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
Tab. 4.a
To Next Page
Loading...