Fläkt Woods
8265 GB 2011.10
7
Specifications are subject to alteration without notice
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.
Motor trouble shooting chart
Your motor service and any trouble shooting must be
handled by qualified persons with proper tools and
equipment.
TROUBLE
CAUSE
WHAT TO DO
Motor fails to start
Blown fuses
Replace fuses with proper type and rating.
Overload trips
Check and reset overload in starter.
Improper power supply
Check to see that power supplied agrees with motor
name plate and load factor.
Improper line connections
Check connections with diagram supplied with motor.
Open circuit in winding or control switch
Indicated by humming sound when switch is closed. Check for loose
wiring connection. Also, ensure that all control contacts are closing.
Mechanical failure
Check to see if motor and drive turn freely. Check bearings and lubrication.
Short circuited stator
Indicated by blown fuses. Motor must be rewound.
Poor stator coil connection
Remove end bells, locate with test lamp.
Rotor defective
Look for broken bars or end rings.
Motor may be overloaded
Reduce load.
Motor stalls
One phase may be open
Check lines for open phase.
Wrong application
Change type or size. Consult manufacturer.
Overload
Reduce load.
Low voltage
Ensure the name plate voltage is maintained. Check connection.
Open circuit
Fuses blown, check overload relay, stator and push buttons.
Motor runs and then
dies down
Power failure
Check for loose connections to line, fuses and control.
Motor does not
come up to speed
Not applied properly
Consult supplier for proper type.
Voltage too low at motor terminals
because of line drop
Use higher voltage or transformer terminals or reduce load.
Check connections. Check conductors for proper size.
Starting load too high
Check load motor is supposes to carry at start.
Broken rotor bars or loose rotor
Look for cracks near the rings. A new rotor may be
required, as repairs are usually temporary.
Open primary circuit
Locate fault with testing device and repair.
Motor takes too long to
accelerate and/or draws
high amp
Excessive load
Reduce load.
Low voltage during start
Check for high resistance. Adequate wire size.
Defective squirrel cage rotor
Replace with new rotor.
Applied voltage too low
Get power company to increase power tap.
Wrong rotation
Wrong sequence of phases
Reverse connections at motor or at switchboard.
Motor overheats while
running underloaded
Overload
Reduce load.
Frame or bracket vents may be clogged
with dirt and prevent proper ventilation
of motor
Open vent holes and check for a continuous stream of air from the motor.
Motor may have one phase open
Check to make sure that all leads are well connected.
Grounded coil
Locate and repair.
Unbalanced terminal voltage
Check for faulty leads, connections and transformers.
