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 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 powers supply and prevent
the spread of damages and accidents.
This unit is for 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.
Don't operate with on/off of the switch set up in the converter side and the inverter side. Do an
operation stop by the operation order (FW / RV) terminals.
This inverter becomes the following condition at the time of open phase because open phase prote-
ction is being made ineffective by the early data.
R phase or T phase, open phase condition: The power isn't turned on, and it doesn't operate.
S phase, open phase condition: It becomes single-phase operation condition. Trip operation such as
a deficiency voltage or over current may be done. Don't use it under open phase condition.
A converter module may be damaged in the case shown below. Be careful.
When an unbalance of the power supply voltage is more than 3%.
Power supply capacity, 10 times of the capacity of inverter and case beyond 500kVA.
When a change in the rapid power supply voltage occur.
(Example) When inverter of the plural is installed with the common electric wire whose it is short by
each other. When there is insertion of the condenser or a removal.
On/off of the power supply isn't to do it more than three times in one minute.
It has the possibility that inverter is damaged.
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 meters, 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.
Make the RC value of the thermal relay the value of 1.1 times of motor rated electric current.
Install output ACL when a life becomes short by the length of wiring.
Chapter 2 Installation and Wiring
N300-P INSTRUCTION MANUAL
Summary of Contents for N300-P
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