Wiring Of Main Circuit Terminals And Grounding Terminals - Fuji Electric FRENIC-HVAC User Manual

5.1.6

Wiring of main circuit terminals and grounding terminals

Perform wiring in the order given below. This section also outlines terminal functions.
Primary grounding terminal ( G) for inverter enclosure
Two grounding terminals ( G) are not exclusive to the power supply wiring (primary circuit) or
motor wiring (secondary circuit).
Be sure to ground either of the two grounding terminals for safety and noise reduction. The inverter
is designed for use with safety grounding to avoid electric shock, fire and other disasters.
1) Ground the inverter in compliance with the national or local electric code.
2) Use a thick grounding wire with a large surface area and keep the wiring length as short as
possible.
Inverter output terminals U, V, and W and secondary grounding terminals ( G) for motor
Inverter's output terminals should be connected as follows:
1) Connect the three wires of the 3-phase motor to terminals U, V, and W, aligning the phases each
other.
2) Connect the grounding wire of output lines (U, V, and W) to the grounding terminal ( G).
When there is more than one combination of an inverter and motor, do not use a multicore
cable for the purpose of handling their wirings together.
Use shielded wires for the motor cable and route the cable as short as possible. Clamp the
shield to the specified point inside the inverter.
DC reactor terminals P1 and P(+) (on 230 V class series inverters of 75 HP or above and 460 V
ones of 150 HP or above and 575 V ones of 150 HP or above)
Connect terminals [P1] and [P(+)] of a DC reactor (DCR) bundled as standard for power factor
correction to these terminals.
• The wiring length should be 10 m (33 ft) or below.
• When an AC power supply is connected, be sure to connect a DCR.
• If a PWM converter is connected to the inverter, no DCR is required.
DC link bus terminals P(+) and N(-)
For connection to the DC link bus.
When you need to use the DC link bus terminals P(+) and N(-), consult your Fuji Electric
representative.
Main circuit power input terminals L1/R, L2/S, and L3/T (three-phase input)
The three-phase input power lines are connected to these terminals.
1) For safety, make sure that the molded case circuit breaker (MCCB) or magnetic contactor (MC)
is turned OFF before wiring the main circuit power input terminals.
5.1 Mounting and Wiring the Inverter
5-9