Watson-Marlow 720DuN User Manual
47
18.10 Outputs
The 720DuN pump offers four relay status outputs. See 12
Switching the pump on
for the first time
for initial start-up defaults. Each of six parameters can be config-
ured to any output, or more than one output.
The parameters are:
Run/stop
Provides a status output to indicate whether the pumphead is in a running or
stopped condition. When running at 0rpm, the run/stop output indicates run-
ning.
Direction
Provides a status output to indicate which direction the pump is set to run in.
Auto/man
Provides a status output to indicate whether the pump is in analogue control
mode or manual control mode.
General alarm
Provides an alarm output when any system error condition occurs except: leak
detected; analogue signal out of range; analogue over-signal; analogue no sig-
nal.
Leak detected
When used with a leak detector, this output provides an alarm when the pump
has been automatically switched off following tube failure.
Head
Provides an alarm when the pumphead track is open. If it is running, the pump
will stop.
Outputs 1-4 are available as single-pole change-over relay contacts: Relay 1, 2, 3
and 4. Connect to the normally open or normally closed contacts of the relay as
required and configure the pump’s software accordingly. See below in this section.
Note
: The maximum rating on the relay contacts of this pump is 30VDC; maximum
load 30W.
