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Watson-Marlow 620DuN and 620Du User Manual 79
the pump rotates after receiving a low signal on Analogue 1 (4mA, 1V or 0V);
the speed at which the pump rotates after receiving a high signal on Analogue
1 (20mA, 5V or 10V); the set speed (that is: the speed at which the pump is
currently rotating according to the analogue speed signal and the analogue
scaling signal if scaling is set); and the flowrate in the units selected (see 18.8
Flow units). The scaling percentage is also displayed if it is set.
If manual scaling is enabled using the Setup menu (see 18.2 Analogue), the
scaling percentage can be adjusted between 0% and 100% using the UP and
DOWN keys.
The pump responds to remote digital inputs. If the run/stop input stops the
pump, the bottom line of the auto running screen shows “Remote stop”. When
it starts the pump again, this will disappear and the pump returns to normal
running mode.
If the pump is stopped because a leak is detected, the screen displays “LEAK
DETECTED. Check and reset, then press Stop”. See 26.1 Error codes.
The remote status outputs operate fully.
How to get out of auto operation
If you entered auto operation by pressing AUTO (SHIFT, 9) and selecting
Analogue, return to manual operation by pressing MAN (SHIFT, 6).
If you entered auto operation by making the remote auto / manual input go
high, leave auto operation by making the remote auto / manual input go low
(0V).
The pump returns to manual operation and retains the set speed and run
status from its previous operation in analogue mode.
Emergency stop
In an emergency press the STOP key. The pump stops and displays an inter-
ruption screen.
If keypad lock is in place when STOP is pressed, or if the pump is in auto
mode via the digital input, the interruption screen offers one key-press: press
START to continue auto operation.
If keypad lock was not in place when STOP was pressed, the interruption
screen offers a choice: Continue to continue auto operation, or Manual to
switch to manual mode. Use the UP and DOWN keys to choose and press
ENTER to confirm.