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8 Troubleshooting
Risk of injuries caused by running aggregate!
▶ Do not touch the running aggregate.
▶ Do not carry out any works on the running aggregate.
▶ Prior to carrying out any assembly or maintenance works, de-energize the motor and protect it against restart.
Risk of death from electric shock!
▶ Any electrical works must be carried out by qualifi ed electricians only.
▶ Observe the IEC 30364 (DIN VDE 0100) and for potentially explosive areas the IEC 60079 (DIN VDE 0165) standard.
Risk of injuries caused by vacuum and harmful media to be pumped and operating liquid!
▶ Use protective equipment when carrying out any works on the aggregate.
▶ Make sure the aggregate is depressurized.
▶ Drain the pump. Reliably collect operating liquid and media to be pumped and dispose of in an environmentally-
compatible way.
If the machine operator is not able to rectify occurring defects himself, he has to call the person responsible for machine
maintenance.
If the maintenance staff is not able to rectify the defect, the manufacturer has to be informed accordingly. Th e
manufacturer will provide troubleshooting support if he gets a detailed description of the defect.
Defect
Cause
Motor does
Motor
not start
One phase of the power supply is interrupted
Two phases of the power supply are interrupted
Th e motor protection switch has tripped
Th e motor is blocked
Pump is blocked
Impeller/inter casing is subject to corrosion
Ice inside the pump (solidifi ed operating liquid)
Contaminations or foreign bodies inside the
pump
Pump calcifi cation
Blocked/defective impeller
Defective motor bearing
Motor
Short-circuit in the motor winding
protection
Motor protection switch has not been correctly
triggered
set/is defective
Motor overload
Excessive backpressure in the outlet nozzle
Excessive share of liquid in the suction fl ow
Blocked suction-side fi tting
Motor or pump blocked
D A N G E R
R I S K O F E L E C T R I C S H O C K
WA R N I N G
26
255548 Rev.1
Solution
▶
▶
Check the power supply, check the motor
▶
Check the power supply, check the motor
▶
Switch on the motor protection switch
▶
Check the motor
▶
▶
Use rust remover to overcome the blockage of the pump
▶
Carefully heat up and defrost the pump
▶
Flush/disassemble the pump, clean it
▶
Descale the pump
▶
Provide for a correct gap size of the inter casing/ impeller
or replace
▶
Replace the motor bearing
▶
Check the motor winding
▶
Check setting/replace the motor protection switch
▶
Check/reduce the operating liquid fl ow rate
▶
Reduce backpressure
▶
Reduce the share of liquid
▶
Open the suction-side fi tting
▶
Motor does not start
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