Watson-Marlow 720UN and 720SN User Manual
24
AUTO/MAN
: toggles the pump into analogue control. When started, the pump
runs at the speed set by any analogue signal applied to the pump, and in the di-
rection shown in the display.
STOP
: if the pump is running, pressing
STOP
stops the pump. The display will
continue to show the previous speed and direction. The pump will return to this
speed and direction when the
START
key is pressed again.
UP
: increases the speed shown on the display in minimum steps of 0.1rpm, or
other steps as pre-selected in the Scrolling section of the Setup menu, (unless
the speed displayed is already the maximum allowed speed). If the pump is
then started by pressing the
START
key, it will operate at the new speed. If the
pump is running when
UP
in pressed, the change takes effect immediately.
Note
: If the pump’s flow rate has been calibrated (see 17.3
Calibration
), after a
speed change a screen showing the new rpm figure and the new flowrate is dis-
played for four seconds before returning the user to the previously set manual
mode main screen: rpm or flowrate.
DOWN
: decreases the speed shown on the display in minimum steps of 0.1rpm,
or other steps as pre-selected in the Scrolling section of the Setup menu. If the
pump is then started by pressing the
START
key, it operates at the new speed.
The minimum speed possible is 0.1rpm. If the pump is running when
DOWN
is
pressed, the change takes effect immediately.
Note
: If the pump’s flow rate has been calibrated (see 17.3
Calibration
), after a
speed change a screen showing the new rpm figure and the new flowrate is dis-
played for four seconds before returning the user to the previously set manual
mode main screen: rpm or flowrate.
Note
: You can reduce the pump speed from 0.1rpm (or any other minimum dis-
played unit of speed as selected in the Scrolling section of the Setup menu) to
0rpm by a further press on the
DOWN
key. The pump is still in the running
state and the rotation symbol will continue to move. Press the
UP
key to return
the pump to the minimum speed.
Note
: If a minimum allowed speed has been set in the Set Min Speed section of
the Setup menu, the above note on speed reduction to 0rpm does not apply.
DIRECTION
: toggles the direction of rotation shown on the display. If the pump
is then started by pressing the
START
key, it rotates in the new direction. If the
pump is running when
DIRECTION
is pressed, the change takes effect immedi-
ately.
ENTER
: is used to enter/confirm numeric and menu selections. Also cycles the
information shown on the manual mode main screen exactly as
START
does,
whether the pump is running or not. See
START
, above.
MENU
: causes the main menu to be displayed, from which all aspects of pump
setup can be controlled, including the MemoDose facility. See 15.
Main menu
.
