Watson-Marlow 620DuN and 620Du User Manual 36
the UP or DOWN keys to make a selection and press ENTER to confirm
your decision.
The pump displays a screen inviting the user to enter the required speed
proportion for low signal input (4mA or 0V) as a value from 0% to 100%
Enter your value using the UP or DOWN keys and confirm by pressing
ENTER.
A similar screen allows the user to enter the required speed proportion for
high signal input (20mA or 10V) as a value from 0% to 100%. Enter the
value in the same way.
If STOP is pressed at any point in the program setup (before pressing
ENTER on the high signal speed proportion screen), the pump displays the
previous screen.
When high and low values have been entered and confirmed, the pump con-
figures the hardware and basic calibration data. A confirmation screen is dis-
played briefly, followed by a warning that the analogue signal has not been
trimmed. The user is returned to the Analogue setup screen.
See 22.4 Scaling: analogue input 2 in Automatic control wiring.
18.2.3 Trim
Trim displays the Trim menu, described above. See 18.1 Trim. It is recommended
that a trim calibration is always performed to align the pump’s response to the actu-
al process analogue signal.
18.2.4 Exit
Exit returns the user to the first section of the Setup menu, described above. See
18 Setup.
18.3 Display
The pump can display three default screens in manual mode: revolutions per
minute, flowrate in a choice of units, or both.
In the first screen of the Setup menu select Display using the UP and DOWN