Watson-Marlow SP Series - Manual (Page 26)

26
9 TROUBLESHOOTING
If the hose pump does not function (correctly), consult the following checklist to see if you
can remedy the error yourself. If this is not the case, please contact your Bredel
representative.
Problem Possible Cause Correction
Check that the supply power switch is on. No voltage
Check the electrical supply is available at
the pump.
Stalled rotor Check that the pump is stalled by
incorrect fitting of the hose.
Failure to operate
Lubricant level monitoring system
has been activated. Check that the lubricant level monitoring
system has stalled the pump. Check the
functioning of the lubricant level
monitoring system, or check the lubricant
level.
Non standard hose lubricant used. Consult the Bredel representative for the
correct lubricant.
Low lubricant level. Add Bredel lubricant, see for the required
amount of lubricant “Maintenance”:
“Changing lubricant”.
Product temperature too high. Consult the Bredel representative about
the maximum temperature range of the
product.
Internal friction on the hose caused
by blocked or poor suction
characteristics. Check pipework/valves for blockages.
Ensure that the suction pipework is as
short as possible and that the diameter is
large enough.
Over-shimming of the pump rotor
shoes (not for SP/10, SP/15 and
SP/20) Consult the diagram, see “Specifications”:
“Shims specifications”. Remove excess
shims.
High pump temperature.
High pump speed. Reduce pump speed to a minimum.
Consult with your Bredel pump
representative for advice on optimum
pump speeds.
Shut-off valve in the suction line
(partly) closed. Fully open the valve.
Under shimming of the pressing
shoes. Consult the diagram (see “Specifications”:
“Shims specifications”. Fit the correct
number of shims.
Hose rupture or badly worn hose Replace hose, see “Maintenance”:
“Replacing pump hose”.
Low capacity/pressure
(Partial) blockage of the suction line
or too little product on the suction
side. Ensure that the suction line is clear of
blockages and that sufficient product is
available.