Watson-Marlow 720DuN User Manual 37
18.1 Trim
When the pump is under remote control, it tracks an analogue signal from the user’s
remote control system to the i/p terminal of the Analogue 1 and Analogue 2 con-
nectors at the rear of the pump within the ranges 4-20mA, 0-10V or 1-5V. The Trim
setup sequence allows the user to customise the process-signal-to-pump-speed cal-
ibration. The sequence may be entered directly from the Setup menu or from the
Analogue setup menu.
Select Trim from the Setup menu or the Analogue setup menu using the UP or
DOWN keys and press ENTER to confirm your choice.
Apply the low process analogue signal to the i/p terminal of the Analogue 1
connector as instructed in the display. See 18.2 Analogue. While the signal is
being applied, press ENTER to record the signal as a calibration point.
Apply the maximum process control signal. While the signal is being applied,
press ENTER to record the signal as a calibration point.
Apply 50% of the maximum process control signal. While the signal is being
applied, press ENTER to record the signal as a calibration point.
If a mistake is made, press STOP at any point in the sequence, and the pump
displays the previous screen.
The final press on ENTER ends the Analogue 1 trimming sequence.
If Analogue 2 has been configured, the pump displays a similar sequence of
screens for that input. Apply the low, high and mid-range signal to the i/p
terminal of the Analogue 2 connector as instructed in the display, pressing
ENTER each time to record the signals as calibration points.
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