WET WELL CONTROL (Pump Down)
Typically, wet wells are used to temporarily hold storm and/or waste water. When the
surface reaches a high level setpoint, the wet well is pumped down. The discharge
goes on to another wet well or directly to the treatment facility.
The HYDRO+ provides wet well control with only minimal application programming.
For the following example, we’ll assume Empty (P006) was set from the transducer
face to the wet well floor. (To monitor wet well overflow, see the note at the end of the
OCM Application example).
(If the transducer cannot be located to avoid acoustic beam interference from the
pumps, set Empty (P006) from the transducer face to the top of the pump(s).
RELAY INTERCONNECTION
The relay contact illustrations adjacent to the HYDRO+ relay terminals are shown in
the power off, de-energized, alarm on, pump off condition.
Connect the HYDRO+ relays as follows:
RL1 to Pump 1 control (energized = pump on, de-energized = pump off)
RL2 to Pump 2 control (energized = pump on, de-energized = pump off)
RL3 to Hi Alarm indicator (energized = alarm off, de-energized = alarm on)
RL4 to Lo Alarm indicator (energized = alarm off, de-energized = alarm on)
RL5 not used
FULL
HI Alarm On
HI Alarm Off
Start Pump 1
Start Pump 2
Stop Pumps
Lo Alarm Off
Lo Alarm On
EMPTY
Pump Down,
2 Alternate
Assist Pumps
PL-507 42
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