Handle Switch - Bennett 3000 Series Service Manual

531 Commercial / Industrial Electronics
Handle Switch Circuit - Original style handle board shown here.
Handle Switch Circuit Board
Magnetic Pickup mounted
in the white plastic material
Theory of Operation - Handle Switches - Handle switches allow the
system to know that the customer wants to dispense fuel and signals
the CPU to turn on the pump motor. The handle switch uses a "reed"
style proximity switch in conjunction with a magnet to signal when the
nozzle has been removed from the boot or when the handle has been
lifted (lift lever).
When the nozzle is removed from the nozzle boot the spring loaded
flapper moves bringing the magnet in proximity to a reed switch on the
handle circuit board. When this happens, the reed switch is pulled in
completing a circuit. When the CPU sees the circuit go from "Open" to
"Closed" it knows the handle has been turned on. Then the CPU sends
the +12 volt dc signal to the relay to turn on the motor. When the
handle is returned to the nozzle boot this signals that the sale is
complete and the CPU sends this information to the Point of Sale
device (if there is one) so that the sale may be collected. The valve
should close immediately (less than 1/2 second) after the handle is
hung up. The sale cannot be collected unless the handle switch is off.
Current production style board -
The current board uses barrel style
connectors rather than
jumpers and a solid state magnetic
switch rather than a glass style.
Both the original and the current
board functions the same and the
part numbers remain the same.
55
Jumper must be set
across jumper
When set this way, the
handle looks like a nor-
mally "Open"
and when the magnet
pulls in the reed switch,
it "closes" the circuit.
Black and red wire
connect the
switch board to the
Barrier Circuit.
Fig. 2 - This is an example of
the "Lift Lever".
Fig 3 - Reed switch S1 is
pulled in by the magnet to
complete the circuit. Jumper
must be across JP2 .
shunt
Reed Switch
107932 Rev G 4-24-17
JP2.
switch
handle