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10
Wiring
Main Circuit Input/Output
•
Phase rotation of input terminals L1 (R), L2 (S), L3 (T) is available
in either direction, clockwise and counterclockwise.
•
When Inverter output terminals T1 (U), T2 (V), and T3 (W) are
connected to motor terminals T1 (U), T2 (V), and T3 (W), respec-
tively, motor rotates counterclockwise, viewed from opposite
drive end, upon forward operation command. To reverse the rota-
tion interchange any two of motor leads.
•
Never connect AC main circuit power supply to output terminals
T1 (U), T2 (V), and T3 (W).
•
Care should be taken to prevent contact of wiring leads with the
3G3XV cabinet, or a short-circuit may result.
•
Never connect the power factor correction capacitor or noise filter
to 3G3XV output.
•
Never open or close contactors in the output circuit unless
Inverter is properly sized.
Caution
The withstand voltage between the motor’s phases is insuffi-
cient.
When the motor is connected to the Inverter’s output, a surge is
generated between the Inverter’s switching and the motor’s coil.
Normally the maximum surge voltage is three times the Inverter’s
input power supply voltage (i.e., 600 V for 200-V class, and
1,200 V for 400-V class). Be sure to use a motor with a withstand
voltage between the motor’s phases that is greater than the maxi-
mum surge voltage. In particular, when using a 400-V-class
Inverter, use a special motor for Inverters.
Wiring
Section 1-4