Page 46 MiniRanger Plus 7ML19981CJ01
Applications
Pump Control Application
The basic difference between a simple level application and a pump control
application is that the relays assigned to pump function (P111) are normally
de-energized (off) and energized when required to run the pump. In the
program mode, pump relays are held de-energized.
Pumps can be programmed to work independently or in lead/lag fashion.
Refer to 36.
In applications where flooding is possible, a submersible transducer should
be used. The submersible transducer's air cavity insures that a high level
reading is maintained rather than establishing a loss of echo condition, when
the liquid level reaches the transducer. When using a submersible
transducer, set P802 = 1.
Example
The application is to control the level in a wet well. It is required that the level
be displayed in centimetres. The transducer is mounted at 3.6 m from the
bottom and is equipped with a submergence coupling as there is possibility
of flooding in the well. Two pumps are to be controlled by the MiniRanger
Plus in lead / lag fashion. The first pump to start at 1 m and the second
pump to start at 2 m. Both pumps are to stop at 0.25 m. The maximum
estimated filling rate is 1 m/min. In the event of a loss of echo, a fail-safe low
after 6 sec is required to protect the pumps from running dry.
P006
3.6m
P007
3.0m
relay 2,
pump on
P112-2, 1m
relay 1 & 2,
pumps off
P113-1&2, 0.25m
relay 1,
pump on
P112-1, 2m
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