Watson-Marlow SPS 600 - Manual (Page 15)

Revision 4.1 / March 2014 15
21 Troubleshooting
Error Cause Remedy
Pump does not draw in
Direction of rotation not correct Check direction of rotation
No wetting liquid in the pump Fill pump with liquid
Screw fastening not tight Check screw fastening
Suction pipe too long Adapt suction pipe
Pipe cross-section too narrow Adapt suction pipe
Shaft seal leaking Check all seals for damage
Wear in the pump Change wearing parts
Motor speed not correct Measure, regulate speed
Gate and Gate Guide wrongly
inserted Check position (see changing
direction of rotation)
Pump does not deliver
Direction of rotation not correct Check direction of rotation
Suction and pressure pipe confused Check pipe system
Motor speed not correct
Check speed based on output
diagrams
Wearing parts worn Replace wearing parts
Gate and Gate Guide wrong Check position (see changing
direction of rotation)
Inserted closed gate valve Check pipe system
Pump is noisy
Noises come from the drive Consult
Watson-Marlow MasoSine
Noises come from the pump Consult
Watson-Marlow MasoSine
Suction pipe too small (cavitation) Shorten suction pipe or increase
diameter, reduce speed
Knocking noises from the pump
head Gate valve wear
Noises from power frame Fill oil, change tapered roller
bearings
Coupling not aligned Align coupling with hairline
Pump leaking at leakage
hole
Sealing system is leaking Change seal faces, static /
dynamic or lip seals
O-ring seal leaking Replace O-ring
Radial shaft sealing ring on the
power frame leaking, oil escapes Dismantle power frame,
replace lip seals
Pump leaking at the front
housing
Housing seal not or wrongly installed Install housing O-ring correctly or
replace
Housing seal defective Install housing O-ring correctly or
replace
Pump has blocked Foreign body in the pump Remove foreign body, examine
pump for damage
Power supply interrupted Check electrical installations
(fuses), check drive
Defect on the drive (Separate the coupling and turn
the pump by hand)
Strong wear after short
operating time
Solids in the pumped material
Pumped material is abrasive Frequent change of the wearing
parts, change material pairing,
reduce speed