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
.
