The anti-cycling option built into the F29 allows the user to set the maximum
number of times the pump can be safely started in any one hour period. If
you select yes to this option the screen that follows will ask you to enter the
maximum number of times the pump can be started in any one hour. The
number of starts can be set from 1 start per hour to 1800 starts per hour.
Please contact your pump supplier to obtain the correct figure for your
specific pump. In operation, the anti-cycling system monitors both time and
the number of starts and compares the two. If the starts per hour rate is
exceeded for a settable number of consecutive times in any one hour period
the pump will be automatically shut down and the controller will display a
message indicating the starts per hour rate was exceeded.
After setting the required number of starts per hour and pressing
(P)
you
are asked how many starts in a row you are prepared to accept. The default
setting is 5 starts. This can be adjusted between 2 and 50 starts. Assuming
you accept the default of 5 sequential starts then as a simple example of
the way the anti-cycling system works, if starts per hour rate is set to 360
(one start every 10 seconds maximum) and the pump started 4 times in a
row at less than 10 seconds between each start and then did not start
again for 12 seconds the anti-cycling shutdown will not be invoked. If,
however, the pump was to start 5 times in a row with less than 10 seconds
between the starts the anti-cycling system would be invoked and the
pump will shut down. In a conventional pressure system, the anti- cycling
function can be used to protect the pump from damage in the event of the
system’s air cell losing its air charge. If air is lost from a system’s air cell
due to a ruptured diaphragm or leaking air valve, the pump will hunt on and
off rapidly. Such rapid cycling will cause the pump to overheat very
quickly. Anti-cycling can also be used in conjunction with burst pipe
detection. Burst pipe detection is an effective guard against a burst pipe.
Anti-cycling is effective at detecting a split pipe that causes a pump to
cycle on and off.
MAXIMUM STARTS PER HOUR
NUMBER OF STARTS IN SEQUENCE
31
