Watson-Marlow 720DuN User Manual
38
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 2 trimming sequence.
When trimming is complete the pump displays a confirmation screen and redis-
plays the screen from which it entered the trim sequence: the Setup menu or
the Analogue setup menu.
The pump calculates linear responses from low to mid and from mid to high, and
records the results as new analogue input calibration graphs.
If any of the three signals applied to each input match, a warning screen is displayed
before the confirmation screen appears, and the trim is ignored.
Note
: By applying the maximum process control signal when the minimum is
requested and vice versa, inverted responses can be set up.
Note
: Resetting factory defaults clears the trim calibration values.
18.2 Analogue
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 connector at the rear
of the pump within the ranges 4-20mA, 0-10V or 1-5V. The
Analogue
option in the
Setup menu allows the user to configure the pump to operate with his remote con-
trol system.
Select
Analogue
from the Setup menu using the
UP
or
DOWN
keys and press
ENTER
to confirm your choice.
Four options are displayed:
Input 1 - speed, Scaling - stroke, Trim
and
Exit
.
Input 1 - speed
allows the user to tell the pump which signal type he will apply to
Analogue 1, or to choose the program option. If he selects
Program
from the sub-
sequent menu, the user can choose his input type and tell the pump the speeds at
which to operate on receiving a low or high process control signal. See 18.2.1
Input
1 - speed
.
Scaling - stroke
allows the user to disable scaling control, or if he wishes to enable
scaling, to tell the pump which signal type he will apply to Analogue 2, or to choose
the program option. If he selects
Program
from the subsequent menu, the user can
choose his input type and tell the pump the speed proportion at which to operate on
receiving a low or high process control signal. See 18.2.1
Input 1 - speed
.
Trim
displays the Trim menu, described above. See 18.1
Trim
.
Exit
returns the user to the first section of the Setup menu. See 18
Setup
.
