Watson-Marlow 620U - Manual (Page 26)

Watson-Marlow 620UN, 620U, 620SN, 620S User Manual 26
START: starts the pump at the speed and in the direction shown on the dis-
play. The rotation symbol will become animated to confirm that the pump is
operating.
If the pump is running when START is pressed, it causes the information
shown on the manual mode main screen to cycle from revolutions per minute,
to flowrate in millilitres per minute (via a warning screen if flowrate has not
been calibrated and if this is the first cycle since power-up) to rpm and
flowrate. An example is shown here.
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.
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.
STOP is also used in the MemoDose facility, while calibrating the pump, and
setting the maximum speed.
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.