Watson-Marlow 720UN and 720SN User Manual
66
Emergency stop
In an emergency press the
STOP
key. The pump stops and displays an interrup-
tion screen.
If keypad lock is in place when
STOP
is pressed, or if the pump is in auto mode
via the digital input, the interruption screen offers one key-press: press
START
to continue auto operation.
If keypad lock was not in place when
STOP
was pressed, the interruption screen
offers a choice:
Continue
to continue auto operation, or
Manual
to switch to
manual mode. Use the
UP
and
DOWN
keys to choose and press
ENTER
to con-
firm.
21 Troubleshooting
If the pump display remains blank when the pump is on, make the following checks:
Check the position of the voltage selector switch at the rear of the pump.
Check the mains power switch at the rear of the pump.
Check that mains power is available to the pump.
Check the fuse in the fuseholder in the centre of the switchplate at the rear of
the pump.
Check the fuse in the mains power plug if one is present.
If the pump runs but there is little or no flow, make the following checks:
Check that the tube and rotor are in the pumphead.
Check that fluid is supplied to the pump.
Check that the tube is not split or burst.
Check for any kinks or blockages in the lines.
Check that any valves in the lines are open.
Check that the correct wall-thickness tube is being used.
Check direction of rotation.
Check that the rotor is not slipping on the drive shaft.
If trouble persists, technical assistance for this product is available from your
distributor, or Watson-Marlow Ltd, Falmouth TR11 4RU, United Kingdom.
UN, SN
