YASKAWA VS?616G5 Owner's Manual page 22

(f) Installation of Reactor
When connecting an inverter (15 kW or less) to a large capacity power supply transformer
(600 kVA or more), or when switching a phase advancing capacitor, excessive peak current
flows in the input power supply circuit, which may damage the converter section. In such
cases, install a DC reactor (optional) between inverter ¨1 and ¨2 terminals or an AC
reactor (optional) on the input side. Installation of a reactor is effective for improvement
of power factor on the power supply side.
(g) Installation of Surge Suppressor
For inductive loads (magnetic contactors, magnetic relays, magnetic valves, solenoids,
magnetic brakes, etc.) connected near the inverter, use a surge suppressor simultaneously.
(h) Prohibition of Installation of Phase Advancing Capacitor
If a phase advancing capacitor or surge suppressor is connected in order to improve the
power factor, it may become overheated and damaged by inverter high harmonic
components. Also, the inverter may malfunction because of overcurrent.
(2) Wiring Precautions for Main Circuit Output
(a) Connection of Terminal Block and Load
Connect output terminals U(T1), V(T2) and W(T3) to motor lead wires U(T1), V(T2) and
W(T3). Verify that the motor rotates in the forward direction (CCW: counterclockwise
when viewed from the motor load side) with the forward run command. If the motor rota-
tion is incorrect, exchange any two of output terminals U(T1), V(T2) or W(T3).
(b) Strict Prohibition of Connection of Input Power Supply to Output Terminals
Never connect the input power supply to output terminals U(T1), V(T2) and W(T3).
(c) Strict Prohibition of Short Circuiting or Grounding of Output Circuit
Never touch the output circuit directly or put the output line in contact with the inverter case.
Otherwise, it may cause an electrical shock or grounding. In addition, never short circuit
the output line.
(d) Prohibition of Connection of Phase Advancing Capacitor or LC/RC Line Filter
Never connect a phase advancing capacitor or LC/RC line filter to the output circuit.
(e) Avoidance of Installation of Magnetic Starter
Do not connect a magnetic starter or magnetic contactor to the output circuit. If the load
is connected while the inverter is running, the inverter overcurrent protective circuit
operates because of inrush current.
3 WIRING
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