Jet J-4200A, Operating Instructions And Parts Manual

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All electrical service work on
your JET sander should be performed by a
qualified, licensed electrician who is familiar with
all safe standard electrical installation practices
and all applicable electrical codes. This includes
local electrical codes which may affect the
connection and operation of the sander in your
specific manufacturing operation.
9.1 Single phase electrical hookup
When connecting your machine to single phase
power, you may be connecting to either 115 or 230
volts, depending upon the motor type provided. Local
codes may, or may not, permit the use of a plug type
of connection for your machine. Where a plug
connection is permitted, the following installation
practices must be followed:
1. The plug used must be a grounding type of plug.
That is, on a 115 volt single phase connection,
the plug must be a three-prong plug with two flat,
parallel blades for the power wires and a single
rounded or U-shaped prong for the ground
connection. On 230 volt single phase
connections, the lug must be a three prong plug
with two flat blades in tandem to carry the
current, and a third round or U-shaped prong for
the ground connection.
2. The service branch to which the plug is
connected must be a branch with a separate
ground wire so the grounding prong of the plug
can be connected to ground effectively.
Note: Local electrical codes in many jurisdictions
DO NOT ALLOW THE USE OF PLUG TYPE
CONNECTIONS FOR SINGLE PHASE POWER
WHEN THE MACHINE IS USED IN A COMMERCIAL
OR INDUSTRIAL ESTABLISHMENT.
In these cases you must connect your machine to the
service branch using a hardwired junction box
connection.
Motor rotation
The motor's rotation should result in the belt sander
moving downward and the disc sander rotating
counterclockwise.
Voltage conversion
Single phase machines are pre-wired for 115V or
230V per customer request. If it becomes necessary
to change the voltage, remove the back cover from
the base and place the machine on its side. Remove
the terminal cover from the motor. Rewire the motor
according to the motor connection diagram in section
12.1. Different electrical plugs are required depending
on which voltage you select. This completes the
voltage conversion process.
Circuit protection
Where the service branch is protected with a fuse or
circuit breaker that has too high a value to offer
protection to the motor supplied, a fuse or circuit
breaker box should be used at the point where the
machine connection is made and the time delay fuse
or circuit breaker should be a value just slightly higher
than the maximum load current draw.
9.2 Three phase electrical hookup
1. Be certain the power to the branch you are
connecting is off and locked out, so power cannot
be reestablished accidentally.
2. Connect the ground wires. These wires will be
either green, or green with a white stripe.
3. Connect the remaining three cable wires to the
three power wires in the service branch.
4. Reestablish the power to the branch.
Motor rotation
The motor should be turning counterclockwise, the
belt sander should be moving downward and the disc
sander should be turning clockwise. If this is the case,
the machine can be considered wired correctly. If the
motor is not turning in the correct direction, take the
following corrective action:
1. Disconnect power in the branch again and be
certain it cannot be accidentally turned on while
you correct the wiring.
2. Reverse ANY TWO of the power wires to the
machine.
3. Reestablish the power to the machine.
4. Turn the machine on. The motor should now be
turning in the correct direction.
Voltage conversion
Three phase machines are pre-wired for 230V or
460V per customer request. If it becomes necessary
to change the voltage:
1. Remove back cover from the base and place
machine on its side.
2. Remove terminal cover from motor. Rewire the
motor according to the motor connection
diagram in section 12.2.
3. Replace the current magnetic switch with the
460V switch (p/n 4202A-5095, purchased
separately – see your dealer or contact JET to
order).
4. This completes the voltage conversion
process.
Circuit protection
Where the service branch is protected with a fuse or
circuit breaker that has too high a value to offer
protection to the motor supplied, a fuse or circuit
breaker box should be used at the point where the
machine connection is made and the time delay fuse
or circuit breaker should be a value just slightly higher
than the maximum load current draw.