SECTION 3
Pr.9.3 Exerciser (D = 0000)
To use this facility, first select alternating duty options 9.1.2 or 9.1.3 in Pr.9.1,
depending on the number of pumps installed.
Enter the number of starts assigned to Pump 1 before the sequence switches to allow
the other pumps to be exercised in turn.
Pr.9.4
Tolerance (D = No Tolerance)
In applications where a greasy topped liquid is being pumped, problems may occur
due to build-up of grease at the levels where pumping starts. It is usually necessary
for this to be cleared manually. To avoid this, varying the "turn on" point for the
pumps by ± 10% of the set point value causes the build-up to occur over a larger area,
significantly reducing the maintenance problem.
Select the tolerance setting from the following list.
Options displayed
Description
9.4.1 No Tolerance No tolerance applied to pumps
9.4.2 Tolerance On Tolerance applied to all pumps
NOTE: The programmed pump “reset” points must be outside the 10% tolerance
zone and outside the blanking distance Pr.4.0.
Pr.9.5
Maintenance (D = All pumps in)
The removal of one pump for maintenance can necessitate a great deal of
readjustment to ensure correct control. Pr.9.5 simplifys this by allowing one pump to
be removed without affecting the control levels. Pumps are re-assigned downwards
so that the highest level is not used, therefore, normal control levels are maintained
for lower level settings.
Select the pump maintenance sequence from the following list.
Options displayed
Description
9.5.1 All pumps in All pumps in
9.5.2 Drop out pump 1 Drop out pump 1
9.5.3 Drop out pump 2 Drop out pump 2
9.5.4 Drop out pump 3 Drop out pump 3
NOTE: a. The system assumes that the lower numbered pumps turn on first.
b. CAUTION - A PUMP NOT INCLUDED IN AN ALTERNATING
SEQUENCE BUT PROGRAMMED INTO THE FIXED PART OF
THE SEQUENCE WILL BE SUBSTITUTED INTO THE
ALTERNATING SEQUENCE TO REPLACE A PUMP DROPPED
OUT.
c. This feature should not be used if the relays are being used for a
mixture of pump control and alarm functions.
Ref: MINIFLEX LR MANUAL Rev. 0 28
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