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2-6
Main Circuit Input/Output
2-7
Grounding
(3) Wiring distance:
It is recommended that the wiring distance of the signal leads (1 to 20) be 50
meters (164 feet) or below.
(1) Phase rotation of input terminals L1 (R), L2 (S), L3 (T) is available in ei-
ther direction, clockwise and counterclockwise.
(2) When inverter output terminals T1 (U), T2 (V), and T3 (W) are connected
to motor terminals T1 (U), T2 (V), and T3 (W), respectively, motor rotates
counterclockwise, viewed from opposite drive end, upon forward operation
command. To reverse the rotation interchange any two of motor leads.
(3) Never connect AC main circuit power supply to output terminals T1 (U),
T2 (V), and T3 (W).
(4) Care should be taken to prevent contact of wiring leads with SYSDRIVE
3G3IV cabinet, for short-circuit may result.
(5) Never connect power factor correction capacitor or noise filter to SYS-
DRIVE 3G3IV output.
(6) Never open or close contactors in the output circuit unless inverter is
properly sized.
Ground the casing of the SYSDRIVE 3G3IV using ground terminal G (E).
(1) Ground resistance should be 100Ω or less.
(2) Never ground SYSDRIVE 3G3IV in common with welding machines, mo-
tors, and other large-current electrical equipment, or ground pole. Run the
ground lead in a separate conduit from leads for large-current electrical
equipment.
(3) Use the ground leads which comply with AWG standards and make the
length as short as possible.
(4) Where several SYSDRIVE 3G3IV units are used side by side, all the units
should preferably be grounded directly to the ground poles. However, con-
necting all the ground terminals of SYSDRIVE 3G3IV in parallel, and ground
only one of SYSDRIVE 3G3IV to the ground pole is also permissible (Fig. 4).
However, do not form a loop with the ground leads.
GOOD
POOR
G(E)
G(E)
G(E)
G(E)
(a)
Fig. 4 Grounding of Three SYSDRIVE 3G3IV Units
VERY POOR
G
G(E)
G(E)
G(E)
(E)
G(E)
(b)
(c)
Section 2-7
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