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8
7.0 Electrical connections
Electrical connections must be
made by a qualified electrician in compliance
with all relevant codes. This machine must be
properly grounded while in use to protect the
operator from electrical shock and possible fatal
injury.
The HBS-1220MSA and HBS-1220MSAH band saw
is rated at 230/460V, 3 phase. It is prewired for 230
volt. Confirm that power available at the saw’s
location matches that for which the saw is wired.
To access electrical panel, push button on rear door
to make handle pop outward, then rotate handle
counterclockwise. Keys are provided in the tool box
for locking the electrical panel door.
Before wiring, make sure saw is disconnected from
power source or that the fuses have been removed
or breakers tripped in the circuit to which the saw
will be connected. Use appropriate Lock-Out/Tag-
Out procedures.
After wiring, if saw runs backward, disconnect from
power and switch any two of the three power leads.
Before connecting to power source, be sure switch
is in off position.
7.1 Voltage conversion
The band saw can be converted from 230V to 460V
operation; consult wiring diagram labels on the
appropriate junction boxes on machine. Diagrams
are also found at back of this manual. (Note: In case
of discrepancy, labels on machine take
precedence.)
Conversion will require additional 460V
components. See your dealer or contact JET to
purchase these items.
1. Make sure saw is disconnected from power
source, or fuses removed or breakers tripped
in the circuit to which saw is being connected.
2. Change incoming power leads into wiring
terminal box on right side of base.
3. Change incoming leads on main motor,
hydraulic motor, and coolant pump, inside the
respective junction boxes.
Open the machine’s electrical panel (refer to Figure
7-1):
4. On the transformer, move R1 wire from 240V to
460V terminal.
5. Replace 230V Overload Relay for Oil Pump
with 460V Overload Relay for Oil Pump (p/n
HBS1220MSA-OOP460).
6. Replace 230V Overload Relay for Main Motor
with 460V Overload Relay for Main Motor
(HBS1220MSA-OMM460).
7. Replace two 230V fuses with two 460V/1A
fuses (p/n HBS1220MSA-FU1A).
8. Close all covers before starting the saw.
Figure 7-1
8.0 Adjustments
Disconnect saw from power
source before making adjustments, unless
indicated otherwise.
8.1 Removing and installing blade
A general purpose blade has been installed,
tensioned, and tracked on the band saw and should
not require immediate attention. For future blade
replacement, proceed as follows:
1. Raise bow enough for blade to clear table slot.
2. Disconnect machine from power source.
3. Open blade wheel cover (A, Figure 8-1). Make
sure rubber stop at top of bow is properly
adjusted to prevent cover from falling.
4. Remove upper gap cover (B) and lower blade
guard (C).
5. Release blade tension by turning blade tension
handle (D) counterclockwise.
Figure 8-1: installing blade=
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