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Watson-Marlow 620DuN and 620Du User Manual 21
AUTO (SHIFT, 9): has no effect if the pump is running in auto mode. Stops
the pump if it is running in Manual mode and displays a screen offering three
choices: manual control, analogue control or network control. Use the UP and
DOWN keys to make a choice. Press the ENTER key to confirm your decision.
When started under analogue or network control, the pump runs at the speed
set by any analogue or serial communications signal applied to the pump, and
in the direction shown in the display.
MAN (SHIFT, 6): stops the pump if it is running in an auto mode and displays
the manual mode main screen. Has no effect if the pump is already running in
manual mode.
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 Setup (18.15), (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 Calibration), after a
speed change a screen showing the new rpm figure and the new flowrate is
displayed for four seconds before returning the user to the previously set man-
ual 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 Setup
(18.15). 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 Calibration), after a
speed change a screen showing the new rpm figure and the new flowrate is
displayed for four seconds before returning the user to the previously set man-
ual mode main screen: rpm or flowrate.
Note: You can reduce the pump speed from 0.1rpm (or any other minimum
displayed unit of speed as selected in the Scrolling section of Setup (18.15)) 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 (SHIFT, 1): toggles the direction of rotation shown on the dis-
play. 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 immediately.
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 (SHIFT, 7): causes the main menu to be displayed, from which all
aspects of pump setup can be controlled. See 15 Main menu.
CLEAR (SHIFT, 5): clears numeric entries so that they can be entered again.
CAL (SHIFT, 8): takes the user to the calibrate sequence.
. (decimal point, period) (SHIFT, 0): used in numeric expressions as a
decimal point. To enter 5.3, press 5, SHIFT, 0, 3. (Some languages use ,
(comma) to represent a decimal point. This pump uses .)