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G0646/G0647 50/65 Ton Ironworker
-13-
The Model G0646/G0647 can be converted for
440V operation. This conversion job consists
of disconnecting the machine from the power
source, changing the connections on the voltage
transformer, replacing the overload relay, and
rewiring the motor for 440V operation.
The necessary overload relay for this procedure
can be purchased by calling Grizzly Customer
Service at (800) 523-4777 and ordering Part
Number P0646209-1.
All wiring changes must be inspected by a quali-
fied electrician before the machine is connected
to the power source. If, at any time during this pro-
cedure you need help, call Grizzly Tech Support
at (570) 546-9663.
To rewire the Model G0646/G0647 for 440V
operation:
1. DISCONNECT MACHINE FROM POWER!
2. Rotate the main power switch to OFF or "0"
and the electrical cabinet door lock to the
horizontal, then open the door to access the
voltage transformer (see
Figure 6).
440V Conversion
Figure 7. "S" wire connected to the 440V
terminal of the voltage transformer.
3. At the voltage transformer, remove the wire
labeled "S" that leads to the “220” terminal,
and connect that wire to the “440” terminal
(see Figure 7).
4. Remove the overload relay and replace it with
the 440V version (Part Number P0646209-1).
Set the overload relay dial (see
Figure 6) to
the value for your model:
Model G0646 .........................................
7.5A
Model G0647 ............................................
8A
5. Open the junction box on the motor, and
rewire the motor as shown on the diagram
located inside the motor junction box.
Note: The reference motor wiring diagram on
Page 56 was current at the time of printing,
but always use the wiring diagram provided
inside the motor junction box, as it will reflect
any changes to the motor shipped with your
machine.
440v conversion
Figure 6. Voltage transformer and overload relay
inside electrical cabinet.
Note: It may be necessary to put pressure
on the upper left corner of the electrical cabi-
net door to engage and turn the main power
switch.
Overload
Relay
Voltage
Transformer
NOTICE
For 440V connections, an electrician MUST
hardwire the machine (using a metal con-
duit setup) directly to a locking disconnect
switch, which is directly connected to the
power source.
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