22
Analog 4-20 mA mode (Universal and Un
only)
In this remote operating mode the flowrate will be proportional to the external milliamp
signal input received by the pump. The Universal pump will operate at 0 rpm when 4.1 mA
is received and maximum rpm when 19.8 mA is received.
In the Un pump the relationship between the external milliamp signal and the flow
rate is determined by configuring the two points
A
and
B
as shown in the graph below. The
rate of flow can be proportional or inversely proportional to the analogue milliamp input.
Flowrate
A
B
mA
Figure 21 - The default mA/rpm values stored in the pump
A
4.1 mA, 0 rpm
B
(qdos20)—19.8 mA, 55 rpm
B
(qdos30, qdos60, qdos CWT)—19.8 mA, 125 rpm
B
(qdos120)—19.8 mA, 140 rpm
When the mA signal received is greater than the level defined by point A, the run status
output will be energised as the pump is running.
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