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TABLE OF CONTENTS
ELECTRICAL SERVICE
VF-SERIES
SERVICE
MANUAL
HA AS AUTOMATION, INC.
Fig. 2-1 Power lines; hookup location.
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 overloads.] 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.
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 prob
lems, 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.
Fig. 2-2 Transformer connections.
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
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