12
11.0
Troubleshooting AB-12/14 Abrasive Saws
11.1
Machine fault and operating problems
Symptom Possible
Cause
Correction*
Motor will not turn
Low voltage.
Check power line for proper voltage.
Open circuit in motor or loose
connection.
Inspect all lead connections on motor for loose or
open connections.
Emergency Stop engaged
Rotate Emergency Stop button to disengage.
Electrical power supply
Check: the phases; the cables; the plug; the socket.
Also check that the motor connections are in place.
Trigger switch not activating
Check that socket/plug connection from handle to
motor is inserted correctly; check micro-switch in
trigger.
Transformer
Check that the voltages are present both on the
input and output. Otherwise replace.
Magnetic Contactor
Check that the phases in it are present both on the
input and output, that it is not jammed, that it closes
when powered and that it is not causing short
circuits. Change if any of these problems are found.
Thermal relay
Make sure it is closed, i.e. check that the phases
are present in input and output, that it is not causing
short circuits and responds when the reset coil is
closed. If it has tripped to protect the motor, check
the amperage setting, re-set, and check the motor.
Change if necessary.
Motor
Check that it has not burned out, that it turns freely
and that there is no moisture in the connection
terminal board box. The winding can be rewound or
replaced by experienced motor repair personnel.
Motor will not start:
fuses or circuit breakers
blow
Short circuit in line cord or plug.
Inspect cord or plug for damaged insulation and
shorted wires.
Short circuit in motor or loose
connections.
Inspect all connections on motor for loose or
shorted terminals or worn insulation.
Incorrect fuses or circuit breakers
in power line.
Install correct fuses or circuit breakers.
Motor overheats
Motor overloaded.
Reduce load on motor.
Air circulation through motor
restricted.
Clean motor fan with compressed air to restore
normal air circulation.
Motor stalls, resulting in
blown fuses or tripped
circuit
Motor overloaded.
Reduce load on motor.
Short circuit in motor or loose
connections.
Inspect connections on motor for loose or shorted
terminals or worn insulation.
Low voltage.
Correct the low voltage conditions.
Incorrect fuses or circuit breakers
in power line.
Install correct fuses or circuit breakers.
Machine slows when
operating
Applying too much pressure.
Feed blade into workpiece more slowly.
Belt loose.
Tighten belt.
Loud, repetitive noise
coming from machine
Floor uneven.
Shim beneath stand to make level.
Pulley setscrews or keys are
missing or loose.
Inspect keys and setscrews. Replace or tighten if
necessary.
Motor fan is hitting the cover.
Tighten fan or shim cover.
V-belt is defective.
Replace V-belt.
Table 3
*
Warning:
Some corrections may require a qualified electrician.
