Jet J-720R, Operating Instructions And Parts Manual

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If the tag has been lost, it will be necessary for you
to open the electrical cabinet on the rear of the drill
press and examine the connections on the
transformer found inside the box. The transformer
can be connected to either a 230 or 460 volt
source and its taps are labeled for voltage. By
locating the source tap on the transformer you will
be able to determine the branch voltage required.
A service disconnect is recommended. The use of
fuses or circuit breakers for each of the voltage
supply wires is required. Use fuses or circuit
breakers which are appropriate to the voltage for
the motor system delivered.
A positive cut-out/lock-out lever or rocker switch
should be located on the outside of the service
disconnect to allow the machine operator to
disconnect from the branch circuit when working
with tooling on the machine.
It is recommended that the 230 volt Drill Press be
connected to a dedicated 25 amp circuit with a 25
amp circuit breaker or time delay fuse. Connect the
460 volt drill press to a dedicated 15 amp circuit
with 15 amp circuit breaker or time delay fuse.
Local codes take precedence over recommen-
dations.
6.4.3 Connecting branch to drill press
1. Disconnect service branch to machine by
moving lever or rocker switch on cutout box to
OFF.
2. Connect green wire (or green with white trace)
to the branch ground.
3. Connect the remaining three wires in cable
(labeled R, S and T) to the three power lines in
branch.
4. Turn power to machine ON at cutout box.
5. Turn coolant switch (See Figure 7-1) to the ON
position.
Make sure there is coolant
in flood coolant system before operating
pump.
6. Observe the rotation through the glass atop
the pump. Shaft rotation should match
direction of the arrow cast into the pump
assembly. If the shaft is rotating the wrong
direction, the power leads need to be
switched. Correct as follows:
7. Disconnect power to machine by turning it off
at cutout box.
8. Reverse any two of the power lead
connections.
9. Repeat steps 4, 5, and 6, above, and you
should observe the pump shaft turning in the
proper direction. The electrical service to the
machine is now complete.
6.4.4 Converting from 230V to 460V
The J-720R is prewired for 230 volt. To convert to
460 volt input:
1. Change wire connections inside spindle motor
junction box. Follow diagram inside junction
box cover.
2. Change wire connections inside arm elevating
motor junction box. Follow diagram inside
junction box cover.
3. Change wire connections inside coolant pump
motor junction box. Follow diagram inside
junction box cover.
Open electrical box at rear of drill press:
4. Move wire on transformer from 230V terminal
to 460V terminal.
5. Replace both 230V overload relays with 460V
overload relays (part no. E0207007 and
E0207008; additional purchase).
6. Replace (3) 32-amp fuses with (3) 20-amp
fuses (part no. E3101015, additional pur-
chase). Note: The 5-amp fuse should remain
in place.
7. Replace the 230V amp meter (see Figure 7-1)
with the 460V amp meter (part no. E3602003,
additional purchase).