RAKE CONTROL (Differential Level)
Typically a water purification process has a screen on the inlet side to filter solids from
entering the process. Should the screen become blocked, and inflow sufficiently
reduced, process efficiency can often be compromised.
The HYDRO+ provides screen rake control with only minimal application
programming. For the following example, we’ll assume Operation was set for
"differential" (P001 = 4) and Empty (P006) was set from the transducer face to the
channel bottom for both transducer 1 and transducer 2.
RAKE CONTROL
RELAY INTERCONNECTION
The relay contact illustrations adjacent to the HYDRO+ relay terminals are shown in
the power off, de-energized, alarm on, control off condition.
Connect the HYDRO+ relays as follows:
RL1 to Rake control (energized = rake on, de-energized = rake off)
RL2 to Hi Alarm (Point 1) (energized = alarm off, de-energized = alarm on)
RL3 to Lo Alarm (Point 2) (energized = alarm off, de-energized = alarm on)
RL4 to Hi Alarm (Point 3) (energized = alarm off, de-energized = alarm on)
RL5 to transducers See INSTALLATION Interconnection\Transducer
INSTALLATION
PL-507 46
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