ABB MT series Инструкция по установке и обслуживанию - Страница 7
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Installation and maintenance instruction
Fläkt Woods three phase asyncronous motor
Manufacturer: ABB
These instructions do not cover all details or variations in
equipment nor provide for every possible condition to be
met in connection with installation, operation or main-
tenance. Should additional information required, please
contact the nearest ABB Sales Office.
TROUBLE
CAUSE
Motor fails to start
Blown fuses
Overload trips
Improper power supply
Improper line connections
Open circuit in winding or control switch
Mechanical failure
Short circuited stator
Poor stator coil connection
Rotor defective
Motor may be overloaded
Motor stalls
One phase may be open
Wrong application
Overload
Low voltage
Open circuit
Motor runs and then
Power failure
dies down
Motor does not
Not applied properly
come up to speed
Voltage too low at motor terminals
because of line drop
Starting load too high
Broken rotor bars or loose rotor
Open primary circuit
Motor takes too long to
Excessive load
accelerate and/or draws
Low voltage during start
high amp
Defective squirrel cage rotor
Applied voltage too low
Wrong rotation
Wrong sequence of phases
Motor overheats while
Overload
running underloaded
Frame or bracket vents may be clogged
with dirt and prevent proper ventilation
of motor
Motor may have one phase open
Grounded coil
Unbalanced terminal voltage
Fläkt Woods
8265 GB 2011.10
Motor trouble shooting chart
Your motor service and any trouble shooting must be
handled by qualified persons with proper tools and
equipment.
WHAT TO DO
Replace fuses with proper type and rating.
Check and reset overload in starter.
Check to see that power supplied agrees with motor
name plate and load factor.
Check connections with diagram supplied with motor.
Indicated by humming sound when switch is closed. Check for loose
wiring connection. Also, ensure that all control contacts are closing.
Check to see if motor and drive turn freely. Check bearings and lubrication.
Indicated by blown fuses. Motor must be rewound.
Remove end bells, locate with test lamp.
Look for broken bars or end rings.
Reduce load.
Check lines for open phase.
Change type or size. Consult manufacturer.
Reduce load.
Ensure the name plate voltage is maintained. Check connection.
Fuses blown, check overload relay, stator and push buttons.
Check for loose connections to line, fuses and control.
Consult supplier for proper type.
Use higher voltage or transformer terminals or reduce load.
Check connections. Check conductors for proper size.
Check load motor is supposes to carry at start.
Look for cracks near the rings. A new rotor may be
required, as repairs are usually temporary.
Locate fault with testing device and repair.
Reduce load.
Check for high resistance. Adequate wire size.
Replace with new rotor.
Get power company to increase power tap.
Reverse connections at motor or at switchboard.
Reduce load.
Open vent holes and check for a continuous stream of air from the motor.
Check to make sure that all leads are well connected.
Locate and repair.
Check for faulty leads, connections and transformers.
7
Specifications are subject to alteration without notice