Watson-Marlow 401U - Manual (Page 4)

4
Manual operation
• Insert the mains transformer jack plug into the round socket on the pump back panel.
• Pumps delivered with multi-plug mains adaptor: see pictures above for how to change plugs.
• Switch power on at the mains socket. Power at the pump will be signalled by the illumination of a green
LED on the pump front panel.
• The manual speed control potentiometer has three positions.
• The speed setting dial is calibrated in proportion of maximum speed from 0-10 which represents a 10:1
speed reduction ratio from the maximum speed of the pump. Turn the control knob clockwise to increase
the speed and counter-clockwise to decrease the speed.
• When changing the direction of flow, turn the ccwcw switch to its central off position until the
pumphead rotor stops; then turn it to the required direction of rotation which will re-start the pump.
• If returning from auto control to manual control, disconnect the process signal from the pump.
In the event of a power failure, the pump will automatically re-start when the power is
returned. This will occur under manual or remote control.
IP21
ccw position ( I II) means the rotor
will rotate counter-clockwise at its
set speed.
cw position (II I ) means the rotor
will rotate clockwise at its set speed
Centre position (I I I) means that
the pump rotor will be stopped
0
1
2
3
4
5
6 7
8
9
10 cw ccw cw ccw cw ccw
0
1
2
3
4
5
6 7
8
9
10 cw ccw cw ccw cw ccw
0
1
2
3
4
5
6 7
8
9
10
EU US UK AU 18VDC CMP SA07H18