Extension Cords - Powermatic 31A Operating Instructions And Parts Manual

Converting from 230 Volt to 460 Volt
(Three Phase Only)
Consult the wiring diagram inside the starter box
cover. A similar diagram is also included at the
back of this manual. The sander must comply
with all local and national codes after being
wired.
1. Replace the current contactor with the 460V
magnetic contactor (part no. 31A-MSA-2;
purchased separately).
2. Re-connect the incoming leads to the motor
in accordance with 460 volt operation, as
shown in the wiring diagram.
3. If using a plug, install a proper UL/CSA
listed plug suitable for 460 volt operation.
Three-Phase Test Run
On the three-phase unit, after wiring has been
completed, you should check that the wires
have been connected properly:
1. Connect machine to power source and
press the start button.
2. The sanding disc and belt should move in
accordance with the arrow directions on the
machine. If the movement is backward, stop
the machine and disconnect machine
from power.
3. Switch any two of the three wires at "R,S,T".
Grounding Instructions
(Refer to page 7 for more information on
grounding this machine.) This machine must be
grounded. In the event of a malfunction or
breakdown, grounding provides a path of least
resistance for electric current to reduce the risk
of electric shock.
Improper connection
grounding conductor can result in a risk of
electric shock. The conductor with insulation
having an outer surface that is green with or
without yellow stripes,
grounding conductor. If repair or replacement of
the electric cord or plug is necessary, do not
connect the equipment-grounding conductor to a
live terminal.
Check with a qualified electrician or service
personnel if the grounding instructions are not
completely understood, or if in doubt as to
whether the tool is properly grounded.
Repair or replace a damaged or worn cord
immediately.
of the equipment-
is the equipment-

Extension Cords

An extension cord is not recommended; if
possible, position your Sander within reach of
the power supply. If an extension cord becomes
necessary, make sure the cord rating is suitable
for the amperage listed on the machine's motor
plate. An undersize cord will cause a drop in line
voltage resulting in
overheating.
Use the chart in Figure 14 as a general guide in
choosing the correct size cord. If in doubt, use
the next heavier gauge. The smaller the gauge
number, the heavier the cord.
Recommended Gauges (AWG) of Extension Cords
Extension Cord Length *
25 50
Amps feet feet
< 5 16 16
5 to 8 16 16
8 to 12 14 14
12 to 15 12 12
15 to 20 10 10
21 to 30 10 NR
*based on limiting the line voltage drop to 5V at 150% of the
rated amperes.
NR: Not Recommended.
Figure 14
14
loss of power and
75 100 150 200
feet feet feet feet
16 14 12 12
14 12 10 NR
12 10 NR NR
10 10 NR NR
10 NR NR NR
NR NR NR NR