N700 Operating Instructions and Parts Manual
2. Installation and Wiring
12
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. Be sure to verify 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 and T)
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Connect the main power terminals (R, S and T) to the power supply through an
electromagnetic contactor or an earth-leakage breaker.
N700 recommends connecting the electromagnetic contactor to the main power
terminals, because when the protective function of the inverter operates, it isolates the
power supply and prevents the spread of damage and accident.
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This unit is for a three-phase power supply. Be sure not to power a three-phase only
inverter with single phase power. Otherwise, there is the possibility of damage to the
inverter and the danger of fire.
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If you require a single phase power supply unit, please contact your local HYUNDAI
Branch.
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The inverter enters into the following condition at the occurrence of open phase if it is
selected open phase protection is valid :
-
R phase, S phase or T phase, open phase condition:
It becomes single-phase operation condition. Trip operation, such as a deficiency
voltage or over current, may occur.
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Don't use it under open phase condition. A converter module may be damaged as a
result of the following conditions. Use caution when
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an unbalance of the power supply voltage is more than 3%
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Power supply capacity is more than 10 times of the capacity of inverter and case
beyond 500kVA.
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A drastic change in the power supply
(Example) Turning on/off of the power supply should not be done more than three
times in one minute. It has the possibility of damaging the inverter.
②
Inverter output terminals (U, V, and W)
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Using
a heavier gauge wire can prevent the voltage drop. (refer to page 15)
Particularly when outputting low frequencies, the torque of the motor will be reduced
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.
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In the case of the cable length being more than 65 feet, 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. When an EMC filter is to be installed, please contact
your local HYUNDAI branch.
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In the case of two or more motors, install a thermal relay to each motor.
