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Watson-Marlow 620DuN and 620Du User Manual 78
24 Automatic control and operation
Check that the pump is ready to run before selecting automatic operation. Remote
control signals may start the pump without warning.
How to get into auto operation
While the manual mode main screen is displayed, press AUTO (SHIFT, 9), or
apply a high signal (5-24V) to the remote auto / manual input.
If auto entry was triggered remotely, the pump responds to the analogue signal
as soon as this is done and shows the “AUTO” icon.
If auto entry was triggered using AUTO (SHIFT, 9), the pump offers three
choices: Analogue, Manual and Network. Use the UP and DOWN keys to
choose and press ENTER to confirm.
Selecting Manual returns the user to the manual mode main screen. See 14
Manual operation.
Selecting Network puts the pump into network (RS232 or RS485) mode.
See 25 Network control and operation.
Selecting Analogue puts the pump into analogue mode. It responds to the
analogue signal as soon as this is done and shows the “AUTO” icon.
The pump is automatically switched into auto-restart mode and displays the !
icon. The only keys active are STOP, MAN (SHIFT, 6), DIRECTION (SHIFT,
1) and START (available only as an extended keypress to toggle keypad lock).
UP and DOWN keys are available if manual scaling has been set (see below).
If the remote direction input is active and the direction-enable link is applied,
the DIRECTION (SHIFT, 1) key is disabled. If keypad lock is set, only STOP
and START (available as an extended keypress to toggle keypad lock) are
active.
The pump displays whichever of six auto running screens is appropriate accord-
ing to the previously selected auto mode - 4-20mA, 1-5V or 0-10V with or
without scaling in place.
The auto running screens display four pieces of information: the speed at which
DuN, Du