Watson-Marlow 520DuN IP66/NEMA 4X User Manual
58
Press the
STOP
key twice within half a second to return to MemoDose. The dis-
play shows the previous percentage dose size. The pump will dose at the new
speed.
Note
: To retain the MemoDose value through a power interruption the pump must
be in auto-restart mode. The dosing cycle will resume at the start of a dose and wait
for
START
to be pressed, with the MemoDose percentage screen displayed. See
18.12
Auto-restart
.
20.2 Footswitch operation and other
remote inputs and outputs with
MemoDose
A footswitch or a momentary contact switch can be used
to trigger MemoDose dispensing as a hands-free alterna-
tive to pressing
START
.
To install a footswitch, connect it between the
+5V
termi-
nal and the
i/p
terminal of the Dose input connector (J3).
Alternatively a logic signal of between 5V and 24V can be
applied to the
i/p
terminal of the Dose input connector
(J3), ground to the
OV
terminal.
To operate MemoDose with a footswitch, briefly press the
footswitch while the MemoDose percentage screen is dis-
played.
The remote run / stop input is operational. If a dose is interrupted by a remote stop
signal, the dose will continue from where it stopped when the state is changed to
run.
Remote direction control is disabled. The leak-detection input is operational. All sta-
tus outputs are operational.
Note
: The keypad lock feature is particularly useful to prevent inadvertent dose
changes while using the MemoDose facility. Keypad lock continues to operate in
MemoDose if previously enabled; it can also be enabled while in MemoDose mode.
See 14.2
Keypad lock
.
21 Exit
Press
Exit
in the Main menu to return to the Manual mode main screen.
