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4.4.2 CAUTIONS FOR WIRING
(A) MAIN CIRCUIT INPUT/OUTPUT
(1) Phase rotation of input terminals L1 (R), L2 (S), L3 (T) is available in either direction.
(Clockwise and counterclockwise).
(2) When AC Drive output terminals T1 (U), T2 (V), and T3 (W) are connected to motor terminals
T1(U), T2 (V), and T3 (W), respectively, the motor rotates counterclockwise. (Viewed from opposite
side of drive end, upon forward operation command). To reverse the rotation interchange any
two of the motor leads.
(3) Never connect the AC main circuit power supply to output terminals T1 (U), T2 (V), and T3 (W).
This may cause damage to the AC Drive.
(4) Care should be taken to prevent contact of wiring leads with the PA7300 cabinet. If this occurs, a
short-circuit may result.
(5) Never connect power factor correction capacitors or noise filters to the PA7300 output.
(6) Never open or close contactors in the output circuit unless AC Drive is properly sized.
(7) The main circuit wiring should use suitable O-type terminals, and the width of each terminal must
be less than the terminal block to insure that each terminal is isolated.
CAUTION
The external interconnection wiring must be performed with the following procedures.
After completing PA7300 interconnections, be sure to check that connections are
correct. Never use control circuit buzzer check.
CAUTION
• Lead size should be determined by taking into account voltage drops of leads. Voltage drops can
be obtained by the following equation: select lead size such that voltage drop will be within 2% of
the normal rated voltage.
Phase-to-phase voltage drop (V):
=√3 x lead resistance ( Ω /km) X wiring distance(m) x current(A) X 10
-3
.
• Wiring length between AC Drive and motor:
If total wiring distance between AC Drive and motor is excessively long and AC Drive carrier
frequency (main transistor switching frequency) is high, harmonic leakage current from the cable
could affect the inverter unit or peripheral devices. If the wiring distance between inverter and
motor is long, reduce the AC Drive carrier frequency.
4-8
PA 7300
PART I: INSTALLATION MANUAL
Содержание PA7300 Series
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Страница 154: ...5100 N IH 35 Round Rock Texas 78681 USA 1 800 279 4007 www tecowestinghouse com ...