Watson-Marlow 401U User Manual
Page 5
5
Remote control
The 401U pump can be controlled remotely via 0-10V or 4-20 mA analogue signals. 400AC1, 400AC2,
400AC3 and 400AC4 remote control cables with a 15-pin D-sub connector are available from your local
Watson-Marlow dealer. Wiring diagrams for each control cable are shown at the bottom of this section.
When using the 400AC1 (0-10V) or 400AC2 (4-20mA) remote control cables for analogue speed control and
switching cw/stop/ccw:
•
Set the front panel control potentiometer to the centre position (stop).
•
The manual speed control potentiometer sets the range of the remote speed signal, and it can be
adjusted during remote control use. If the manual speed is set to 5 the remote control works for
speeds 0-50%. Set the manual control potentiometer to 10 for full analogue speed range control.
•
Start or stop the pump in either cw or ccw direction remotely as shown in the relevant wiring
diagrams. If the remote switch is set to stop, cw or ccw direction switching can be achieved using the
front control potentiometer.
When using the 400AC3 cw/stop/ccw remote cable
•
Set the pump speed using the manual speed control potentiometer.
•
Start or stop the pump in either cw or ccw direction remotely as shown in the relevant wiring diagram.
If the remote switch is set to stop, cw or ccw direction switching can be achieved using the front
control potentiometer.
When using the 400AC4 start/stop 3m remote cable with footswitch fitted:
•
Set the pump speed and direction of rotation via the manual speed control potentiometer.
•
Start or stop the pump remotely as shown in the relevant wiring diagram.
Care and maintenance
The only scheduled maintenance of the pump unit is to inspect the motor brushes and to replace them when
necessary, understanding that motor brushes are not covered by the two-year warranty. It is recommended
that all maintenance to this pump is carried out by a Watson-Marlow servicing agent.
The life of the brushes depends on the duty of the pump but is expected to be at least 2500 hours.
If the pump requires cleaning use a mild solution of detergent in water after removing the pumphead. Do
not use strong solvents.
400AC1
400AC2
400AC3
4-20mA
7
1
4
11
5
8
9
6
1
4 5
2
8
0-10V
1
4
8
11
5
+
2
-