Main Circuit Wiring - Hyundai N700E Instruction Manual

N700E INSTRUCTION MANUAL
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)
 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.
 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. (Applicable 3 Phase Only)
 If you require a single phase power supply unit, please contact your local HYUNDAI Branch.
 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.
 Don't use it under open phase condition. A converter module may be damaged as a result of
the following conditions. Use caution when
- an unbalance of the power supply voltage is more than 3%
- Power supply capacity is more than 10 times of the capacity of inverter and case beyond
500kVA.
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
② Inverter output terminals (U, V, and W)
 Using a heavier gauge wire can prevent the voltage drop.
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.
 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.
Recommended Cable length between Driver and Motor
Cable length
Carrier Frequency
 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.
③ External braking resistor connection terminals (P, RB)
 The regenerative braking circuit (BRD) is built-in as standard
 When braking is required, install an external-braking resistor to these terminals.
 The cable length should be less than 16 feet, and twist the two connecting wires to reduce
inductance.
Do not 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.
minute. It has the possibility of damaging the inverter.
164 feet or less
15kHz or less
328 feet or less
5kHz or less
2-7
Greater than 328 feet
2kHz or less