Wilo Drain TMT 32M - Troubleshooting and Possible Solutions; Unit Will Not Start Diagnosis; Motor Protection Trigger Issues; Pumping Failure Diagnosis

38 WILOSE04/2014V05DINA4
English TROUBLESHOOTINGANDPOSSIBLESOLUTIONS
• Always secure the pump against an accidental
restart by disconnecting it from the mains. Take
appropriate safety precautions.
• Always have a second person on hand to ensure
the pump is switched off in an emergency.
• Secure moving parts to prevent injury.
• Unsanctioned changes to the pump are made at
the operator's own risk and release the manufac-
turer from any warranty obligations.
Fault: The unit will not start
1. Electricitysupplyinterrupted,shortcircuitor
earth fault in the cable or motor windings
• Have the motor and wires checked by a special-
ist and replaced if necessary
2. Fuses,themotorprotectionswitchand/ormoni-
toring devices are triggered
• Have a specialist inspect the connections and
correct them as necessary.
• Have the motor protection switches and fuses
installed or adjusted according to the technical
specications,andresetmonitoringequip-
ment.
• Checkthattheimpellerrunsfreely.Ifnecessary
clean it and ensure it runs freely again
Fault: The unit starts, but the motor protection
switch triggers shortly after commissioning
1. The thermal trigger on the motor protection
switch is incorrectly set
• Have a specialist compare the setting of the
triggerwiththetechnicalspecicationsand
correct it as necessary
2. Increased power consumption due to major volt-
age drop
• Have an electrician check the voltage on each
phase and rewire if necessary
3. Two-phase operation
• Have a specialist inspect the connection and
correct it as necessary
4. Excessive voltage differences on the three phases
• Have a specialist inspect the connection and
the switching system and correct as necessary
5. Incorrect direction of rotation
• Swap the 2 phases of the mains supply
6. Impellerslowedbyaccumulation,cloggingand/or
solidmatter,increasedcurrentconsumption
• Switchoffthepump,secureitagainstbeing
switched back on again and free the impeller or
clear the suction port
7. Theuidistoodense
• Contactthemanufacturer
Fault: Unit is running but not pumping
1. Nouidavailable
• Openinletfortankorslidevalve
2. Intake blocked
• Cleanthesupplyline,slidevalve,suctionpiece,
suction port or suction strainer
3. Impeller blocked or slowed
• Switchoffpump,secureitagainstbeing
switched back on again and free the impeller
4. Faultyhose/piping
• Replace defective parts
5. Intermittent operation
• Checkswitchingsystem
Fault: The unit runs, but not within the specied
operating parameters
1. Intake blocked
• Cleanthesupplyline,slidevalve,suctionpiece,
suction port or suction strainer
2. Slide valve in the pressure pipe shut
• Fullyopentheslidevalve
3. Impeller blocked or slowed
• Switchoffpump,secureitagainstbeing
switched back on again and free the impeller
4. Incorrect direction of rotation
• Replace two phases on the mains supply
5. Air in the system
• Checkthepipelines,pressureshroudand/or
hydraulics,andventifnecessary
6. Pump pumping against excessive pressure
• Checktheslidevalveinthepressurepipeand
openitcompletelyifnecessary,useadifferent
impeller,consulttheplant
7. Signs of wear
• Replace worn parts
8. Faultyhose/piping
• Replace defective parts
9. Inadmissiblelevelsofgasintheuid
• Contactthemanufacturer
10. Two-phase operation
• Have a specialist inspect the connection and
correct it as necessary
11. Excessive decrease in the water table during
operation
• Checkthesupplyandcapacityofthesystem,
and inspect the level control settings and
functionality
Fault: The unit does not run smoothly and is
noisy
1. Pump is operating in an inadmissible range
• Checktheoperationaldataofthepumpand
correct if necessary and/or adjust the operating
conditions
2. Suctionport,suctionstrainerand/orimpeller
clogged
• Cleanthesuctionport,suctionstrainerand/or
impeller
3. Impeller stiff
• Switchoffpump,secureitagainstbeing
switched back on again and free the impeller
4. Inadmissiblelevelsofgasintheuid
• Contactthemanufacturer
5. Two-phase operation
• Have a specialist inspect the connection and
correct it as necessary
6. Incorrect direction of rotation
• Replace two phases on the mains supply
7. Signs of wear
• Replace worn parts
8. Defective motor bearing
• Contactthemanufacturer
9. Pump is installed under tension
• Checkinstallation,useexpansionjointsif
necessary