Milltronics HydroRanger I - Example 2

NOTE: sequential operation can be programmed as either cumulative,
duty/back-up or ratio, but not more than one The HydroRanger I will take
the last mode entered as the common choice for all sequenced relays.
Relays assigned to pump control operation are software set that no two pumps can
start up within 10 seconds of each other, a power failure or return to the RUN mode.
When in the calibrate mode, pump relays will be held de-energized (OFF). In the event
of a loss of echo condition, the pump relays can be individually programmed to be:
•
de-energized (dE)
•
energized (En)
•
hold (Ho)
when the fail-safe timer P-75 expires. Refer to Section V, relays.
The mA output, however, will remain at its prior value but will respond to measurements
taken when “MEAS” is pressed.
In applications where flooding is possible, the transducer should be fitted with the
optional submergence coupling. The coupling creates a cavity of trapped air that
insures that a high level reading will be maintained rather than a loss of echo condition
when the liquid level reaches the transducer.
In addition, parameter P-23 must be set
to accommodate this feature.
P-24 through P-28 are multi-level parameters related to the respective relays (1-5)
when assigned to a pump control function. The parameter levels are accessed by
pressing "*" and are identified in the display as ‘P’, ‘C’ and ‘A’.
P - : log of the pump service hours
C - : log of the number of pump starts
The ‘P’ and ‘C’ levels may also be viewed while in the run mode by pressing
the respective "PUMP" keys. The initial pressing of the key causes the
display to show the service hours. Holding the key in for at least five
seconds causes the number of starts to be displayed. Each log may be reset
to 0 by pressing "CLR" and then "ENTER" or preset to a particular value.
The preset value is immediately stored in memory, however subsequent
values are only stored every 4 hours. Thus, after a power failure, the logs
will display last value stored. The logs automatically reset to 0 after
reaching a value 9,999.
A - : ratio setting for sequential / ratio pump control.
Refer to Figure 6.
Example 2
The application is to control the level in a wet well 3 meters deep. It is required that:
•
the level be displayed in meters
PL-399 6 – 8