Speck Normblock Multi 65/250 - Page 31

Faults
04/2019 EN 31
Fault: Increased bearing temperature
Possible cause Solution
Pump strained or
vibrations in the pipes.
 Check pipe connections and
p
ump fasteners, if necessar
y
reduce the pipe bracket
spac
ing.
 Fasten pipes using
vibration
reducing materials.
Increased axial thrust –
(further enquiry
required).
 Clean relief bore in impeller.
Flow rate too low.  Increase minimum flow rate.
Fault: Unauthorised increase in pump temperature
Possible cause Solution
Pump and pipes not
completely ventilated or
filled.
 Ventilate pump.
 Fill pump.
Suction height too
large/Unit’s NPSH
(intake) too low.
 Correct the fluid level.
 Install pump lower.
 Completely open shut-off valve
in the intake.
 If the resistance is too large,
modify the intake
line.
 Check suction basket/suction
opening.
 Observe the permitted pressure
reduction speed.
Flow rate too low.  Increase minimum flow rate.