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Watson-Marlow 620DuN and 620Du User Manual 22
Keypress combinations cause the pump to function as follows:
Note: A number of the controls listed below are shortcuts to commands which are
also available through the Main menu. See 15 Main menu.
UP and 1 (DIRECTION) on power-up: toggles the keypad beep on and off.
START on power-up: switches on the Auto-restart facility. See 18.12 Auto-
restart.
STOP on power-up: switches off the Auto-restart facility. See 18.12 Auto-
restart.
STOP and UP while the pump is stopped: turns the display backlight on.
STOP and DOWN while the pump is stopped: turns the display backlight off.
SHIFT and UP: sets the pump to maximum allowed speed. Note: Unlike its
action elsewhere, SHIFT must be pressed and held. Note: The MAX key has a
similar function, but causes the pump to run at maximum allowed speed only
while the key is pressed.
SHIFT and DOWN: sets the pump to minimum allowed speed. Note: Unlike its
action elsewhere, SHIFT must be pressed and held.
1 (DIRECTION) and DOWN, pressed simultaneously: interrupts the display to
show the pump’s ROM version for four seconds.
START pressed and held for four seconds: toggles the keypad lock on and off.
Only the START and STOP keys are active when keypad lock is on. The pad-
lock icon is displayed.
STOP pressed and held for two seconds: toggles the keypad lock on and off.
Only the START and STOP keys are active when keypad lock is on. The pad-
lock icon is displayed.
STOP STOP within half a second: shortcut entry to MemoDose; when in
MemoDose, shortcut return to manual mode main screen. See 20 MemoDose.
14.2 Speed
To change the running speed:
Use the UP and DOWN keys to change the pump’s running speed within limits
of 0.1 rpm or other minimum allowed speed and the maximum allowed speed.
Note: You can reduce the pump speed from 0.1 rpm to 0 rpm 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 min-
imum speed.
Note: The maximum allowed speed of the drive defaults to 165rpm. It is possible
to set this limit at any speed up to 265rpm. See 18.13 Set maximum allowed speed,
and section 3 Three-year warranty.
14.3 Direction
To toggle the pump’s rotation sense:
Press DIRECTION (SHIFT, 1) to toggle the pump between clockwise and
counter-clockwise rotation.
Note: Direction control is available subject to access not being limited by security
code. See 18.22 Security code.