Displays: Litres only, Retail, Multi-price & Preset
A High Flow/Low Flow option is available on high flow dispensers/pumps. The
two-position switch is located on the side of the dispenser/pump by the nozzle
holster.
In the high flow position, the full flow rate of the pump/dispenser will be
available at the nozzle. In the low flow position approximately 40 to 70 lpm will
be available depending upon the application.
High/Low Flow Operation Methods
When the pump is fitted with a hi-lo flow switch, it enables the user to be
able to select two different flow rates.
The switch has two positions: UP for high flow, and DOWN for low flow
(80litres/m). The two termination screws are located at the top.
When the hi-lo switch is used in the "HI" position, it energises outputs on the
C4000 to operate motors #1 and #2 (with a one-second interval before
motor #2 starts), which in turn operates their associated pump.
When the hi-lo switch is in the "LOW" position, only motor #1, and its
associated pump operates.
The changing of the Flow Selector switch position during a
transaction has an immediate effect on 'Pump 2's' operation. I.e. The motor
for 'Pump 2' can be turned off and on during a transaction.
This is used in dispensers supplied by submersible pumps and in pumping
units with a preset operation.
Two solenoids valves 38mm NB & 18mm NB are installed in parallel after
the meter. For high flow, both solenoids valves are open. For low flow, only
the 18mm NB solenoid valve is open.
Method 3 - 3 Phase Pump (M200P)
This is used in pumping units without preset operation.
One 18mmNB-solenoid valve is piped as a 'by-pass' across the pumping
unit. When open this allows some of the product being pumped to return to
the inlet (low-pressure) side of the pump and hence reduces the flow rate
through the nozzle.
To control the solenoids in high/low flow operation, the two core cable from
the flow selector switch connects to 'FLOWx' or 'FLOWx' terminals on the
C4000 Microprocessor PCB connector J12 (see Figure 10). 'FLOW0' is
used for side 'A' and in the case of a dual with high/low flow on both sides,
then side B's flow selector switch connects to the 'FLOW1' terminal. The
switches are to be connected between the 'FLOWx' terminal and 'GND'.
Closing the contacts on the flow selector switch of Side 'A' ('FLOW0')
causes the 'T7' output terminal to energise. For Side B the 'T9' output
terminal is energised. In Method 1 the 38mmNB Solenoid is wired to the
'T7' output and the flow-selector switch is 'closed' in the high flow position.
In Method 2 the 18mmNB Solenoid is wired to the 'T7' output and the flow-
selector switch is 'closed' in the low flow position.
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