Watson-Marlow 520DuN IP66/NEMA 4X User Manual
36
18.1 Trim
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 and Analogue 2 con-
nectors at the rear of the pump within the ranges 4-20mA or 0-10V. The
Trim
setup
sequence allows the user to customise the process-signal-to-pump-speed calibra-
tion. The sequence may be entered directly from the Setup menu or from the
Analogue setup menu.
Select
Trim
from the Setup menu or the Analogue setup menu using the
UP
or
DOWN
keys and press
ENTER
to confirm your choice.
Apply the low process analogue signal to the
i/p
terminal of the Analogue 1
connector as instructed in the display. See 18.2
Analogue
. While the signal is
being applied, press
ENTER
to record the signal as a calibration point.
Apply the maximum process control signal. While the signal is being applied,
press
ENTER
to record the signal as a calibration point.
Apply 50% of the maximum process control signal. While the signal is being
applied, press
ENTER
to record the signal as a calibration point.
If a mistake is made, press
STOP
at any point in the sequence, and the pump
displays the previous screen.
