Mechanical And Electrical Problems - Jet VBS-1610 Operating Instructions And Parts Manual

15.2 Mechanical and electrical problems

Table 2
Trouble
Machine will not
start/restart or
repeatedly trips circuit
breaker or blows
fuses.
Machine will not
start/restart or
repeatedly trips circuit
breaker or blows fuses
(cont.)
Band Saw does not
come up to speed.
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
distinguish).
Motor overheated.
Motor failure.
Miswiring of the unit.
Switch failure.
Extension cord too light or too long.
Low current.
Remedy
Verify machine is connected to power
source. Make sure START button is
pushed in completely, and STOP button
is disengaged.
Replace cord.
When the band saw overloads on the
circuit breaker built into the motor
starter, it may take time for the machine
to cool down before restart. Allow unit to
adequately cool before attempting
restart. If problem persists, 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 first, verifying incoming
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 between
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 qualified electrician
test the motor for function or remove the
motor and take it to a qualified electric
motor repair shop and have it tested.
Double check to confirm all electrical
connections are correct. Refer to
appropriate wiring diagrams to make
any needed corrections.
If switch is suspect, you have two
options: Have a qualified electrician test
the switch for function, or purchase a
new start switch and establish if that
was the problem on changeout.
Replace with adequate size and length
cord.
Contact a qualified electrician.
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