The rotary encoder translates meter turns into electrical pulses. Each turn
of the Bennett meter equals approximately 0.5 litre (eight turns = one US
gallon). The encoder converts this to 150 pulses so that each pulse
corresponds to approximately to 3ml.
Exact values are:
One rotation = 0.47 litre
150 pulses = 0.47 litre
One pulse = 3.1 ml
When the C4000 'head' is used for other meters this ratio can vary, e.g.
from 0.5 litres / turn to as high as 10 litres / turn.
The encoder will rotate up to 600 rpm before 'tripping' an „Er 7‟ message. If
the encoder is disconnected, the C4000 will not start the pump and an „Er 9‟
message will be displayed.
The encoder connects to the C4000 via a six-core (only five cores used)
data cable. The five cores used are:
Orange or White - 5V terminal
Yellow or Black - 0V terminal
Brown - B0 terminal
Blue - B1 terminal
Red - B2 terminal
Where B0, B1 & B2 are the three opto-senser connections
To reverse the rotation of the encoder sensing, the B0 & B2 wires should
be reversed. The error message for reverse rotation is „Er 8‟.
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