Watson-Marlow 720DuN User Manual 41
18.2.2 Scaling - stroke
Select Scaling - stroke using the UP or DOWN keys and press ENTER to
confirm your choice.
The pump offers six further choices: Off, Keypad, 4-20mA, 0-10V, 1-5V and
Program. Use the UP or DOWN keys to make a selection and press ENTER to
confirm your decision.
If Off is selected, scaling control is disabled and the pump displays the
Analogue setup menu.
The other options allow a choice of inputs to control scaling.
If Keypad is selected, scaling will be controlled by entering the scaling fac-
tor using the UP and DOWN keys while the pump is running in Auto ana-
logue mode. See 18.2 Analogue. The pump displays the Analogue setup
menu.
If 4-20mA, 0-10V or 1-5V is selected, the pump configures the hardware
and calibration data appropriately. A confirmation screen is displayed briefly
and the user is returned to the Analogue setup menu.
If Program is selected, the pump offers: mA (4-20mA) and V (0-10V). Use
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.
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