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 gure for your specic 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 by a settable number of consecutive
starts in any one hour period the pump will be automatically shut down and the
E30 will display a message indicating the starts per hour rate was exceeded.
The anti-cycling function can be adjusted in terms of its sensitivity to repeated
rapid restarts. The E30’s menu asks you for a sensitivity number. The range is 2
to 50 restarts in sequence at a time interval that is less than the number of starts
per hour you have entered. The default value is 10. You can make the E30 more
sensitive to rapid cycling by decreasing this number or less sensitive by increasing
this value.
As an example, consider a pump set to a sensitivity value of 10 and also set to
360 starts per hour, one start every 10 seconds maximum. If the pump starts 9
times in a row at less than 10 seconds between starts and then does not start
again for 12 seconds the anti-cycling alarm will not be invoked. If however, the
pump were to start 10 times in a row at less than 10 seconds between starts, on
the eleventh start the anti-cycling system would be invoked and the pump would
be shut down. In the same situation, if the sensitivity setting was 2 rather than
10 then the anti-cycling alarm would be invoked after only 2 consecutive starts at
less than 10 seconds between each start, making it 5 times less tolerant of rapid
cycling that it previously was.
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. The E30’s anti cycling feature can be used to shut
down the pump and prevent damage in such a situation. To use the anti-cycling
function for this type of pump protection simply set the starts per hour to some
value that is marginally higher than the system’s normal start rate. This will avoid
nuisance tripping but will shut the pump down if excessive sequential cycling is
encountered.
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