Stübbe ETLB-S series, Original Operating Manual

Page: 24 / 33

Troubleshooting
Fault number
1 2 3 4 5 6 7 8
Cause Remedy
X X
–
X
–
X
– –
Pump running in the wrong direction Check sense of rotation and correct it if
necessary
( ĺ 5.6.3 Check direction of
rotation, Page 15).
X X
–
X
– – – –
Motor speed too low Compare the required motor speed with
the speci
¿ cations on the pump type
plate. Replace the motor if necessary.
Increase the motor speed if speed
control is available.
–
X
–
X
–
X
– –
Pump parts worn Replace the worn pump parts.
– –
X X
–
X
–
X Pressure-side ¿ tting opened too wide Throttle down at the pressure-side ¿ tting.
Machine the impeller down. Consult the
manufacturer and adjust the impeller
diameter.
– –
X
– –
X
–
X Geodetic differential head, pipe À ow
resistances and/or other resistances lower
than speci
¿ ed
Throttle down the À ow rate at the
pressure-side ¿ tting. Observe the
minimum À ow rate.
Machine the impeller down. Consult the
manufacturer and adjust the impeller
diameter.
– –
X
–
X
– – –
Viscosity lower than expected Machine the impeller down. Consult the
manufacturer and adjust the impeller
diameter.
– –
X
–
X X
–
X Motor speed too high Compare the required motor speed with
the speci
¿ cations on the pump type
plate. Replace the motor if necessary.
Reduce the motor speed if speed control
is available.
– –
X
–
X X
–
X Impeller diameter too large Throttle down the À ow rate at the
pressure-side ¿ tting. Observe the
minimum À ow rate.
Machine the impeller down. Consult the
manufacturer and adjust the impeller
diameter.
X X
–
X
–
X
– –
Impeller out of balance or blocked Clean the impeller.
–
X
–
X
–
X
– –
Hydraulic parts of the pump dirty, clotted or
encrusted Dismount the pump.
Clean the parts.
– – – – –
X
–
X Defective antifriction bearing in motor Replace the antifriction bearing
(
ĺ manufacturer's speci ¿ cations).
– – – – – –
X
–
Connecting bolts not correctly tightened Tighten the connecting bolts.
– – – – – –
X
–
Faulty housing seal Replace the housing seal
– – – – –
X X X Pump distorted
Check the pipe connections and pump
attachment.
–
X
–
X
–
X
–
X Motor running on 2 phases Check the fuse and replace it if
necessary.
Check the cable connections and
insulation.
Tab. 6 Troubleshooting list
24 ETLB-S, ETLB-ST BA-2018.01.25 EN 301 356