3
After the line voltage is connected to the machine, make sure that main circuit breaker (at top-right of rear
cabinet) is OFF . Remove the Lockout / Tagout and Turn ON the power at the source. Using a digital voltmeter
and appropriate safety procedures:
1-Phase Machines: Measure the AC voltage across L1 & L3 at the main circuit breaker. The AC voltage must
be between 220 - 250 volts .
Note: Lower or higher than this voltage can generate low/high voltage alarms.
3-Phase Machines: Measure the AC voltage between all three pair phases at the main circuit breaker. The
AC 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; minimum and maximum voltage
supplied to a machine while it is in operation must be known. 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
line voltage occur, or low line voltage is suspected, an external transformer may be used. If you suspect voltage
problems, voltage should be checked every hour or two during a typical day to be sure it does not fluctuate
more than +5% or -5% from an average.
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