Grundfos MTS Serie Manual De Instrucciones página 25

Fault number
1 2 3 4 5 6
X - - - - -
X - - - - -
X - - - X -
X - - - X -
X - - - X -
X - - X X -
X - - X - X
X X - X X -
X X - X X -
X X - X X -
X X - X X -
X X - X - -
- X - X X -
- X - X - -
- - X - X -
- X - X - -
Cause
7 8
The transport screw plugs are still in
- -
place.
- - The inlet pipe is closed by the valve. • Open the valve.
The inlet pipe is not vented properly
- -
or not filled up completely.
Formation of air pockets in the inlet
- -
pipe.
- - The outlet pipe is blocked.
Incorrect direction of rotation of the
- -
pump.
- - The pump is very dirty.
The inlet pipe, rotor housing or inlet
- -
casing is blocked or encrusted.
- - Air is sucked in.
The pump is cavitating due to an
- -
excessive amount of gas.
Excess play between the following:
- - • spindles
• spindles and housing.
X - The shaft seal is leaking excessively. • Replace the shaft seal.
- X The motor is running on two phases.
- - The motor speed is too low.
- X The motor speed is too high.
An isolating valve in the inlet pipe is
- -
not fully opened.
Remedy
• Remove the transport screw
plugs.
• Dismantle the pump and inspect it
for dry-running damage.
• Fill up the pump and/or pipes
completely and vent them.
• Install a venting device.
• Correct the pipe layout.
• Clean the outlet pipe.
• Exchange any two phases of the
motor power supply. See section
5.1.3 Checking the direction of
rotation.
• Dismount and clean the pump.
• Clean the inlet pipe, rotor housing
or inlet casing.
• Clean the inlet casing.
• Seal the source of air leakage or
repair the malfunctioning
component, if necessary.
• Check the pipes.
• Clean or enlarge the filter.
• Install an inlet pipe with a bigger
cross-section.
• Repair or replace any worn parts.
• Check the fuse and replace it, if
necessary.
• Check the cable connections and
insulation. Replace the cable, if
necessary.
• 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.
• 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.
• Open the valve completely.
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