32
ELRO
®
Pumps for hazardous materials GUP 3-1,5 and GP 20/10Ex
7.0 Troubleshooting
Fault Possible cause
Remedy
No pump flow
Pump loses suction
power or insufficient
pumping capacity
Pump runs very loud
Drive heats up or is
overloaded
Pressure and suction valves closed
No operating voltage
Wrong direction of rotation
Suction line blocked
Leaks in suction pipe (entering of
air)
Suction lift too high
Excessive counter-pressure
Leaks in suction pipe
Suction line blocked
Insufficient suction pressure
Worn pump parts, dosing valve
open
Lubricant level in pump too low
Pump worn or defective
A certain heating of electric motors
is normal
Discharge pressure too high
Open valves
Connect to voltage supply
Reverse the direction of rotation,
check supply line (phase)
Remove blockage
Find and eliminate leaks
Change pump arrangement
Change pump arrangement, if
necessary use different hose
cross-sections
Find and eliminate leaks
Remove blockage
Change pump arrangement
Replace parts, close dosing
valve
Fill in lubricant
Examine, if necessary replace
defective parts
Check current consumption as a
measure of safety
Change pump arrangement
