Watson-Marlow 620U - Manual (Page 24)

Watson-Marlow 620UN, 620U, 620SN, 620S User Manual 24
MAX: while pressed, MAX operates the pump at the maximum allowed speed
and in the direction shown on the display. When released, the pump returns to
its previous status.
Note: Priming can be achieved by pressing the MAX key until fluid flows
through the pump and reaches the point of discharge, and then releasing the
MAX key.
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
direction 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
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 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
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 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 direc-
tion. 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: 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.