Grundfos MTS 140, Инструкция по установке и эксплуатации

Страница: 21 / 36

English (GB)
21
X X - X X - - -
Supply or suction pipe, rotor housing
or suction casing blocked or
encrusted. • Clean the supply or suction pipe,
rotor housing or suction casing.
• Clean the suction casing.
X X - X X - - - Air is sucked in.
• Seal the source of air leakage or
repair the malfunctioning
component, if necessary.
X X - X X - - -
Pump is cavitating due to excessive
amount of gas.
• Check the pipes.
• Clean or enlarge the filter.
• Install supply or suction pipe with
a bigger cross-section.
X X - X X - - -
Excess play between:
• spindles
• spindles and housing. • Repair or replace any worn parts.
X X - X - - X - Shaft seal is leaking excessively. • Replace the shaft seal.
- X - X X - - X Motor is running on two phases.
• Check the fuse and replace it, if
necessary.
• Check the cable connections and
insulation. Replace the cable, if
necessary.
- X - X - - - - Motor speed is too low.
• Compare the required motor
speed with the specifications on
the pump nameplate. Replace the
motor, if necessary.
• Increase the motor speed if speed
control is available.
- - X - X - - X Motor speed is too high.
• Compare the required motor
speed with the specifications on
the pump nameplate. Replace the
motor, if necessary.
• Reduce the motor speed if speed
control is available.
- X - X - - - -
Isolating valve in supply or suction
pipe is not fully opened. • Open the valve completely.
- X - X X - - -
Supply or suction pipe cross-section
is too small.
• Install supply or suction pipe with
a larger cross-section.
• Remove any encrustations from
the suction pipe.
• Open the valve completely.
- X - X X - - -
Suction height too high: NPSH
pump
is larger than NPSH
system
.
• Increase the supply or inlet
pressure.
• Consult the manufacturer.
- X - X X - - -
Pump is cavitating because pumped
liquid temperature is too high.
• Increase the supply or inlet
pressure.
• Lower the pumped liquid
temperature.
• Consult the manufacturer.
- X - X X - - -
Hydraulic parts of the pump are dirty,
clotted or encrusted. • Dismount the pump and clean the
parts.
- X - X - - - X
Viscosity or specific gravity of the
pumped liquid is outside the range
specified for the pump. • Consult the manufacturer.
- X - X X X - - Pump parts are worn. • Replace the worn pump parts.
Fault number
Cause Remedy
1 2 3 4 5 6 7 8