Watson-Marlow 504U/RL - Manual (Page 4)

4
Ingress protection standard will be compromised if fittings are not correctly replaced.
R R R R Rear panel r ear panel r ear panel r ear panel r ear panel recess ecess ecess ecess ecess
The pump rear panel recess houses the following:
1 Signal offset potentiometer 2 Tachometer switch 3 Voltage selection switch 4 Terminal block
5 Fuse holder 6 Signal overload LED 7 Signal range potentiometer.
T T T T Trrrrroub oub oub oub oubleshooting leshooting leshooting leshooting leshooting
Should the unit fail to operate, make the following checks to determine whether or not servicing is required.
•
Check that the power switch is on.
• Check the mains supply is available at the pump unit.
• Check the voltage selector switch is in the correct position.
• Check the fuse in the mains socket.
• Check that the pump is not stalled by incorrect fitting of tubing.
Man Man Man Man Manual oper ual oper ual oper ual oper ual opera aa a ation tion tion tion tion
Start up direction Start the pump by turning the Forward/Off/Reverse switch to the required direction of rotation.
The preferred direction of rotation is clockwise (with fluid entering at the bottom of the right of the pumphead),
which will ensure the longest possible tube life. To operate against higher pressures, use counterclockwise rotation.
Prime To prime the pump at maximum speed turn the Auto/Manual/Max switch on the front panel to its Max
position. When released the switch will return to its Manual position.
Speed control The speed setting dial is calibrated in percentage of maximum speed and has a locking knob to
prevent accidental speed changes.
Stop Stop the pump by turning the Forward/Off/Reverse switch to its central Off position. To change the
direction of flow, turn the Forward/Off/Reverse switch to its central Off position until the pumphead rotor stops,
and turn it to the required direction of rotation.
If returning from auto control to manual control, it is not necesssary to disconnect the process signal from the
pump or adjust the calibration potentiometers.