Mechanical And Electrical Problems - Jet Elite EVBS-20 Operating Instructions And Parts Manual

15.2 MECHANICAL AND ELECTRICAL PROBLEMS

Table 2
Trouble
Machine will not start/restart or re-
peatedly trips circuit breaker or blows
fuses.
20
Probable Cause
No incoming power.
Cord damaged.
Overload automatic reset has not
reset.
Band Saw frequently trips.
Building circuit breaker trips or fuse
blows.
Switch or motor failure (how to distin-
guish).
Motor overheated.
Motor failure.
Remedy
Verify machine is connected to power
source. Make sure START button is
pushed in completely, and STOP but-
ton is disengaged.
Replace cord.
When the band saw overloads on
the circuit breaker built into the motor
starter, it may take time for the ma-
chine to cool down before restart.
Allow unit to adequately cool before
attempting restart. If problem per-
sists, check amp setting on the motor
starter.
One cause of overloading trips which
are not electrical in nature is too heavy
a cut. The solution is to reduce feed
pressure into the blade. If too heavy
a cut is not the problem, then check
the amp setting on the overload relay.
Match the full load amps on the motor
as noted on the motor plate. If amp
setting is correct then there is probably
a loose electrical lead.
Verify that band saw is on a circuit of
correct size. If circuit size is correct,
there is probably a loose electrical
lead.
If you have access to a voltmeter, you
can separate a starter failure from a
motor failure by fi rst, verifying incom-
ing voltage at 220+/-10% and second,
checking the voltage between starter
and motor at 220+/-10%. If incoming
voltage is incorrect, you have a power
supply problem. If voltage between
starter and motor is incorrect, you
have a starter problem. If voltage be-
tween starter and motor is correct, you
have a motor problem.
Clean motor of dust or debris to allow
proper air circulation. Allow motor to
cool down before restarting.
If electric motor is suspect, you have
two options: Have a qualifi ed elec-
trician test the motor for function or
remove the motor and take it to a
qualifi ed electric motor repair shop
and have it tested.
Vertical Band Saw