Carel Compact ROC 140, User Manual

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40
ENG
Control WTS +0300130EN rel. 1.0 - 05.09.2022
11.6.8 Calibration low pressure switch
PS
LOW
With the help of a pressure switch between the feed
water pre-filter and the high pressure pump the system
inlet pressure can be monitored. If the pressure falls
below a mini-mum pressure set on the pressure switch
during
production (e.g. due to a clogged pre-filter), production
can be shut down and the system stopped.
7 MIN. PRESSURE
8 MAX. PRESSURE

7A LOW PRESSURE
ENABLED
» Press the arrow keys éê to select if pressure
switch should be active or inactive.
» Confirm the selection with  .
The program jumps to submenu "7B".
» Default value: ENABLED
7B LOW PRESSURE
CONTACT N.C.
By pressing the arrow éê keys you set switching
direction.
N.O. CONTACT = The input functions as a normally open
contact.
N.C. CONTACT = The input works as a nor-mally closed
contact
» Confirm the selection with  .
The program jumps to submenu "7C"
» Default value: NC
Notice: N.C. contact is set ex works here. Do not
change this! Otherwise there is a risk of damage to the
system.
7C INPUT DELAY
00Sec
» Press the arrow keys éê to set the time of
delay
0 Sec = no delay
(see note at the end of the chapter)
» Confirm the selection with  .
The program jumps to submenu "7D".
» Default value: 05 sec
7D MAX RETRY
0
By pressing the arrow keys
éê
you set the number of
start-up attempts (0-9).
» Confirm the selection with  .
The program jumps to submenu "7E".
» Default value: 4
7E ALARM WASHING
YES
The menu item is not assigned.
Function of the startup repeats:
If the number of start-up repeats is set to "0", the unit
stops as soon as the low-pressure monitor switches
(and any
delay time set has ended). All output relays are switched
off!
The display shows
SYSTEM STOPPED!
LOW PRESSURE
If the number of start-up repeats is set to e.g. "5",
the unit stops as soon as the low-pres-sure monitor
switches (and any delay time set has ended). The feed
water valve SV1 stays activated. The display shows
LOW PRESSURE!
ALARM 1/4
If the minimum inlet pressure returns, the system
starts up again automatically. If the system produces
constantly for the next 10 minutes without any further
disturbance, the repeat counter is reset to "0". If the
pressure drops again, the system stops again and the
counter is raised.
If the minimum inlet pressure does not return, the
system will continue to start up within the next 20
minutes until the number of repeti-tions is reached. All
output relays are now finally switched off! The display
shows
SYSTEM STOPPED!
NO PRESSURE