Watson-Marlow 520Du User Manual
Page 39
Watson-Marlow 520Du User Manual
39
Scaling - stroke
Select Scaling - stroke using the UP or DOWN keys and press ENTER to
confirm your choice.
The pump offers five further choices: Off, Keypad, 4-20mA, 0-10V and
Program. Use the UP or DOWN keys to make a selection and press ENTER to
confirm your decision.
If Off is selected, a confirmation screen is briefly displayed, scaling control is
disabled and the pump redisplays the Analogue setup menu.
The other options allow a choice of inputs to control scaling.
If Keypad is selected, a confirmation screen is briefly displayed. Scaling is
controlled by keypad entry of the scaling factor while the pump is running in
Auto analogue mode.
If 4-20mA or 0-10V is selected, the pump configures the the hardware and
calibration data appropriately. A confirmation screen is displayed briefly and
the user is returned to the Analogue setup screen.
If Program is selected, the pump offers two choices: mA and V. 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 as a value from 0.0 to 1.0. 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 as a value from 0.0 to 1.0. 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 will display
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 22.2 Scaling: analogue input 2 in Automatic control wiring.
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 actual process analogue signal.
Exit
Exit returns the user to the first section of the Setup menu, described above. See
18 Setup.