General Operation
7.7 Pump Control
SITRANS LUT400
114 Operating Instructions, 07/2019, A5E33329501-AC
7.7.6.2 Setting a pump to run-on
This functionality is used to reduce sludge and sediment from building up at the bottom of a
wet well, thereby reducing maintenance. This is achieved by running the pumps below the
normal OFF setpoint and requires you to set a run-on duration and interval to control this
event.
Example:
Pump 1 is set to pump for an extra 60 seconds every 5 hours, pump 2 should not run-on.
Run-On Interval (2.7.2.3.2.)
5 Five hours between pump run-on occurrences.
Run-On Duration Pump 1
60 The pump will run-on for 60 seconds.
Run-On Duration Pump 2
0 Pump 2 will never run-on.
7.7.6.3 Setting the pump start delays
In the event that power to the SITRANS LUT400 has been lost, the pump start delay ensures
that all of the pumps do not start at once to avoid power surges. There are two parameters
used here: Pump Start Delay and Power Resumption Delay.
Example:
The delay between pumps is set to 20 seconds and the delay of the first pump is set to 60
seconds.
Delay Between
Starts (2.7.2.4.1.)
20 Wait at least 20 seconds between pump starts.
Power Resumption
Delay (2.7.2.4.2.)
60 Wait for 60 seconds when power is restored for the first
pump to activate.
7.7.6.4 Reducing wall cling
Use the Wall Cling Reduction function to randomly alter the ON and OFF setpoints over a
range. This eliminates the ridge of material that builds up at the setpoint that can give false
echoes.
This setting may increase the number of days between trips to clean the wet well.
Enable Wall Cling Reduction by setting Enable (2.7.2.1.1) (Page 188) = Enabled. Then set
the range in Level Setpoint Variation (2.7.2.1.2) (Page 188). The pump ON and OFF
setpoints are randomly varied inside this range so the material level does not stop at the
same point each time.
Example:
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