15.1.9.3 Analog 4-20 mA mode (Universal and Un only)
Flowrate proportional to external mA signal input received.
Universal pump will operate at:
l
0 rpm when 4.1 mA received.
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User defined maximum rpm when 19.8 mA received.
Un pump:
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Relationship between external mA signal and flow rate determined by configuring two points A and B as
shown in graph below.
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Rate of flow can be proportional or inversely proportional to analog mA input.
Flowrate
A
B
mA
Figure 3 - The default mA/rpm values stored in the pump
Table 38 - Key to
"Figure 3 - The default mA/rpm values stored in the pump" above
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 mA signal greater than level point A and there is no STOP input, run status output will energise as pump is
running.
15 INSTALLATION: PART 6 (SETTING UP THE PUMP (CONTROL SETTINGS))
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