10
1.4.2 CAUTIONS FOR WIRING
CAUTION
The external interconnection wiring must be performed with the following procedures.
After completing 7200GS/GS510 interconnections, be sure to check that
connections are correct. Never use control circuit buzzer check.
(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 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 side of drive end, upon forward
operation command). To reverse the rotation interchange any two of the motor
leads.
(3) Never connect AC main circuit power supply to output terminals T1 (U), T2 (V),
and T3 (W). This may cause damage to the inverter.
(4) Care should be taken to prevent contact of wiring leads with 7200GS/GS510
cabinet. If this occurs, a short-circuit may result.
(5) Never connect power factor correction capacitors or noise filters to
7200GS/GS510 output.
(6) Never open or close contactors in the output circuit unless inverter is properly
sized.
CAUTION
Lead size should be determined taking into account voltage drop of leads. Voltage
drop can be obtained by the following equation: select such lead size that voltage
drop will be within 2% of 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 inverter and motor.
If total wiring distance between inverter and motor is excessively long and inverter
carrier frequency (main transistor switching frequency) is high, harmonic leakage
current from the cable will increase to effect the inverter unit or peripheral devices.
If the wiring distance between inverter and motor is long, reduce the inverter
carrier frequency.
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