MONARCH SINGLE PHASE INDUCTION MOTORS
INSTRUCTIONS FOR HANDLING, INSTALLATION AND MAINTENANCE
3. CLEANING, LUBRICATION AND MAINTENANCE
Periodical checking of the magnetic starter (where used) is recommended, in order to prevent serious problems
developing such as oxidation and poor electrical contact.
The intake and outlet openings as well as the channels between the cooling fins must be kept clean and
protected against clogging to prevent motor overheating.
Bearings are greased for life and need no further maintenance. This means that greasing can only be carried out
during general overhauls when the motor is disassembled.
4. PROTECTION DEVICES
Thermal Reset Overloads
are fitted to motors up to and including 1.1 kW. If overload should trip motor should
be allowed to cool before the overload is reset. To reset the overload press the red button mounted on the motor
terminal box. Supply to the motor should be disconnected before restart is attempted and cause for the overload
should be investigated.
5. FAULT FINDING & RECOGNITION
Kind of Fault
Symptom
Cause
Remedy
Power-off
Consult power company
Switch-off Switch-on
No fuse
Install fuse
Broken wires
Check wires and repair
Broken lead
Check leads and repair
Motionless
And soundless
Faulty winding
Check winding and
repair
Overload tripped
Reset overload
Short circuit
Check circuit
Incorrect wiring
Check wiring
Poor contact in circuit
switches
Check and repair
Broken wiring
Check and repair
Poor contact of starting
switch
Check and repair
Fail to
Start without
Load
Fuse blowing –
(Circuit Breaker
trips off, slow start
with
electromagnetic
noise
Incorrect connection of
starting switch
Check and repair
Insufficient capacity of
fuse or breaker
Replace fuse or breaker
Overload Lighten
load
Overload after
start
Fuse blowing –
Fail to restart due
to circuit breaker
tripping
High load at low voltage
Check circuit capacity
and reduce load
Faulty internal centrifugal
switchgear
Send for repair
Overload or Intermittent
Overload
Lighten Load
Under-voltage Check
circuit
capacity
and power source
Over-voltage Check
power
source
Fuse blowing (Single
phase rotating)
Install the specified fuse
Poor contact of circuit
switches
Check and repair
Overheating
of Motor
Poor contact of starting
switch
Check and repair
Voltage drop
Check circuit and power
source
Overload after
Start
Speed falls sharply
Sudden overload
Check machine
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