19
Analog 4-20mA 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 4.1mA
is received and maximum rpm when 19.8mA 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.
The default values stored in the pump are:
A
—4.1mA, 0 rpm
B
(qdos20)—19.8mA, 55 rpm
B
(qdos30,qdos60 and qdos120)—19.8mA, 125 rpm
Flowrate
mA
A
B
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.
m-qdos-en-02
67
