VD520 Series Inverter User Manual Mechanical and Electrical Installation
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DANGER
!
● The voltage class of VD520 series inverter 3phase power has two grades: 220V, 380V, before
connecting power, please make sure the power class on inverter nameplate is the same with the
accessing power. Otherwise do not connect.
● DC bus P+ P-terminal: take note that when power outrage there is residual voltage on DC bus P+
P- terminal, need to wait for a while until CHARGE LED off. Otherwise it is danger of electric shock.
● When selecting external braking unit, note the polarity of P+, P- cannot be reversely connect,
otherwise it can result in damage or even fire.
Do not directly connect braking resistor to DC bus, it may result damage or fire.
WARNING
!
1) Input power L, N or R, S T: the cable connection at input side of the inverter has no phase
sequence requirement.
2) Braking unit cable length should not exceed 10m, twisted pair or double cable parallel wiring
should be used.
3) Braking resistor connecting terminal P+, PB: confirm whether the device has built-in braking
unit, its braking resistor connecting terminal is effect. The braking resistor selection table2-4
recommending value and the wiring distance should less than 5M. Otherwise it can damage
inverter.
4) External DC reactor connecting terminal P1, P+: for external DC reactor to 18.5kW and above
power inverter, get rid of the connector between P1, P+ terminal during installation, reactor is
installed between the 2 terminal.
5) Inverter output side U, V, W: the output side cannot connect capacitor or surge absorber,
otherwise it will affect inverter in self-protection frequently or damage.
6) In case the motor cable is too long, it may generate electrical resonance easily due to the impact
of distributed capacitance, thus damaging the motor insulation or generating higher leakage
current to invoke over current protection of the inverter. When the length of motor cable is longer
than 100 meters, it needs to install an AC output reactor.
7) Earth terminal PE:
This terminal shall be grounded reliably, with resistance of earth cable of
less than 10Ω. Otherwise, it may cause fault or damage the inverter.
Do not share the earth terminal with zero line N terminal, otherwise it will result equipment
abnormal run or damage.
