ELECTRICAL INPUT CONNECTION
WARNING
ELECTRIC SHOCK can kill.
•Disconnect input power before proceeding.
•Have a qualified electrician make the input connections.
•Be sure the voltage, phase and frequency of the input power is as specified on the machine nameplate.
Before starting the installation, check with the local power company if there is any question about whether your power supply is adequate for the voltage, amperes, phase and frequency specified on the rear machine nameplate. Also be sure the planned installa- tion will meet the U.S. National Electrical Code and local code requirements.
Use a three phase power supply fused with the rec- ommended super lag fuses. Choose an input and grounding wire size according to local codes or use the table below. “Delay type” circuit breakers (also called “inverse time” or “thermal/magnetic”; which have a delay in tripping action that decreases as the magnitude of the current increases) may be used in place of fuses. Using fuses or circuit breakers smaller than recommended may result in “nuisance” tripping from machine inrush currents even if not cutting or gouging at high currents.
Models that have multiple input voltages specified on the rear nameplate (e.g. 230/460) are shipped con- nected for the higher voltage. If the machine is to be operated on the lower voltage, it must be reconnected according to the instructions on the inside of the removable panel in the center of the rear panel. Electrical supply lines enter the machine next to the removable panel.
WARNING
ELECTRIC SHOCK can kill.
•Make certain that the input power is electrically disconnected before removing the screws that hold the
removable rear panel in place.
Have a qualified electrician connect the input leads to “U”, “V” and “W” of the reconnect panel in accordance with the U.S. National Electrical Code, all local codes and the connection diagram located on the inside of the cover.
The frame of the machine must be grounded. A ground terminal marked with the symbol
located at the left side of the input box is provided for this pur- pose. See the U.S. National Electrical Code for details on proper grounding methods. Follow other grounding instructions per the paragraph under “High Frequency Interference Protection”.
On triple voltage input machines, be sure the recon- nect panel is connected per Figure 1 in the back of this manual, for the voltage being supplied to the machine.
CAUTION
•Failure to follow these instructions can cause imme- diate failure of machine components.
The
RECOMMENDED WIRE SIZE FOR PRO-CUT INPUT CONNECTIONS
Based on 1993 U.S. National Electric Code
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| Wire Size |
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| (Copper, 75°C) |
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Input |
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| Fuse Size | |
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Voltage / Hz. |
| 3 Input Wires |
| 1 Grounding Wire | |||
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230/60 |
| #3 (25mm2) |
| #8 (10mm2) | 125Amp | ||
460/60 |
| #8 (10mm2) |
| #8 (10mm2) | 60Amp |
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220/50/60 |
| #3 (25mm2) |
| #8 (10mm2) | 125Amp |
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380/50/60 |
| #6 (16mm2) |
| #8 (10mm2) | 70Amp |
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440/50/60 |
| #8 (10mm2) |
| #8 (10mm2) | 60Amp |
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| – 10 – |
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