Installation and Wiring
Seite 23 / 180
2.2.2 Main circuit wiring
(1) Warning on wiring
When carrying out work on the Inverter wiring make sure to wait for at least ten minutes
before you remove the cover. Making sure to check that the charge lamp is not illuminated.
A final check should always be made with a voltage meter.
After removing the power supply, there is a time delay before the capacitors will dissipate
their charge.
1. Main power terminals(R, S, T)
Connect the main power terminals (R, S, and T) to the power supply through a
electromagnetic contactor or an earth-leakage breaker.
We recommend connecting the electromagnetic contactor to the main power terminals.
Because when the protective function of inverter operates, it isolates the power supply and
prevent the spread of damages and accidents.
This unit is for the three-phase power supply. It isn’t for the single-phase power supply. If
you require a single phase power supply unit, please contact us.
2. Inverter output terminals (U, V, and W)
Wire with thicker wire than the applicable wire to control the voltage drop.
Particularly when outputting low frequencies, the torque of the motor will reduce by the
voltage drop of the wire.
Do not install power factor correction capacitors or a surge absorber to the output.
The inverter will trip or sustain damage to the capacitors or the surge absorber.
In the case of the cable length being more than 20 metres, it is possible that a surge voltage
will be generated and damage to the motor is caused by the floating capacity or the
inductance in the wire (400V especially).
An EMC Mains Filter is available, please contact us.
In the case of two or more motors, install a thermal relay to each motor.
3. Direct current reactor (DCL) connection terminals (PD, P)
These are the terminals to connect the current reactor DCL (Option) to help improve the
power factor.
The short bar is connected to the terminals when shipped from the factory, if you are to
connect a DCL you will
need to disconnect the short bar first.
When you don’t use a DCL, don’t disconnect the short bar.
4. External braking resistor connection terminals (P, RB)
The regenerative braking circuit (BRD) is built-in as standard up to the 15kw Inverter.
When braking is required, install an external-braking resistor to these terminals.
The cable length should be less than 5 metres, and twist the two connecting wires to reduce
inductance.
Don’t connect any other device other than the external braking resistor to these terminals.
When installing an external braking resistor make sure that the resistance is correctly rated
to limit the current
drawn through the BRD.
