38
INSTALLATION
June 1999
96-8000
NOTE: Make sure that the service wires actually go into the terminal-block clamps. (It
is easy to miss the clamp and tighten the screw. The connection looks fine but
the machine runs intermittently or has other problems, such as servo over-
loads.) To check, simply pull on the wires after the screws are tightened.
2. After the line voltage is connected to the machine, make sure that main circuit breaker (at top-
right of rear cabinet) is OFF (rotate the shaft that connects to the breaker counterclockwise until it
snaps OFF). Turn ON the power at the source. Using an accurate digital voltmeter and appropriate
safety procedures, measure the voltage between all three pair phases at the main circuit breaker
and write down the readings. The voltage must be between 195 and 260 volts (360 and 480 volts for
high voltage option).
NOTE: Wide voltage fluctuations are common in many industrial areas; you need to
know the minimum and maximum voltage which will be supplied to the
machine while it is in operation. U.S. National Electrical Code specifies that
machines should operate with a variation of +5% to -5% around an average
supply voltage. If problems with the line voltage occur, or low line voltage is
suspected, an external transformer may be required. If you suspect voltage
problems, the voltage should be checked every hour or two during a typical day
to make sure that it does not fluctuate more than +5% or -5% from an average.
CAUTION! Make sure that the main breaker is set to OFF and the power is off at your
supply panel BEFORE you change the transformer connections. Make sure
that all three black wires are moved to the correct terminal block and that
they are tight.
3. Check the connections on the transformer at the bottom-right corner of the rear cabinet. The three
black wires labeled 74, 75, and 76 must be moved to the terminal block triple which corresponds to
the average voltage measured in step 2 above. There are four positions for the input power for the
260 volt transformer and five positions for the 480 volt transformer. The input voltage range for each
terminal is as follows:
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