MONARCH SINGLE PHASE INDUCTION MOTORS
INSTRUCTIONS FOR HANDLING, INSTALLATION AND MAINTENANCE
Kind of Fault
Symptom
Cause
Remedy
Insufficient capacity of
switch
Replace switch
Switch overheat
High load
Lighten load
Misalignment between
motor and load
Re-align
Overload after
Start
Bearing Overheat
High bearing noise
Replace damaged
bearing
Reduce load
Increase power supply
Decrease extension lead
length
Increase current carrying
capacity of extension
lead
Motor does
not start
Motors hums and /
or does not
accelerate
Load too great
Power supply is not
sufficient
Extension lead used
Move power supply
towards motor.
Occurrence from first
operation
Check noise not normal
Electro-magnetic
noise induced by
electricity
Sudden sharp noise and
smoking
Short circuit of windings.
Repair.
Bearing noise
Excessive noise
Replace the damaged
bearing
Loose belt sheaf
Adjust key and lock the
screw
Loose coupling
Adjust the position of
couplings and tighten
Loose screw
Tighten screw
Mechanical noise
caused by
machinery
Fan rubbing
Adjust fan position
Rubbing as a result of
ingress of foreign matter
Clean motor interior and
ventilation ducts
Wind noise
Noise induced by air
flowing through
ventilation ducts
Noise
Mechanical noise
caused by
machinery
Induced by conveyance
machine
Repair machine
Short circuit of windings
Repair
Electro-magnetic
vibration
Open circuit of rotor
Repair
Unbalanced rotor
Repair
Vibration
Unbalanced fan
Repair
Broken fan blade
Replace fan
Un-symmetrical centres
between belt sheaf
Align central points
Central points of
couplings do not lie on the
same level
Adjust the central points
of couplings on the same
level
Improper mounting
installation
Lock the mounting screw
Vibration
Mechanical
vibration
Motor mounting bed is not
strong
Reinforce mounting bed
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