SCOV SV800 Series, User Manual

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SV800/SV800A User Manual 4 Electrical wiring and precautions
37

For inverters with power 22KW or less, the braking resistor connection terminals is valid
as the inverter with built-in braking unit.

Please refer to the recommended value for braking resistor selection and the wiring
distance should be less than 5m. Otherwise, it may damage the inverter.
4) External reactor connection ter2, +1:

Please remove the shorting link between the +2 and +1 terminals when need to install
external DC reactor and the reactor is connected between the two terminals.
5) Frequency inverter output terminals U, V, W:

The specifications and installation methods of external power wiring must comply with
local regulations and related IEC standards.

The capacitors or surge absorbers can not be connected to the output side of the inverter.
Otherwise it will cause frequency inverter protection or even damage.

When the motor cable is too long, electrical resonance is easily generated due to the
influence of distributed capacitance, causing motor insulation damage or large leakage current
occurs, which will cause frequency inverter over-current protection. When the motor cable
length is greater than 100m, an AC output reactor must be installed near the inverter.
6) Grounding terminal PE:

The terminal must be reliably grounded. The resistance of the grounding wire must be less
than 0.1Ω. Otherwise, the inverter may work abnormally or even be damaged.

Do not connect the grounding terminal PE to the neutral N terminal of the power supply.

The impedance of the PE conductor must be able to withstand the large short-circuit
current that may occur when a fault occurs.

Please select the size of the PE conductor according to the following table.
Cross-sectional area of a phase line (S)
Minimum cross-sectional area of protective
conductors (Sp)
S ≤ 16mm
2
S
16mm
2
＜
S ≤ 35mm
2
16mm
2
35mm
2 ＜
S S/2

Yellow-green cable must be used as PE conductor.
7) Requirements for the pre-protection device:

Appropriate protection devices should be installed on the input distribution line to protect
the device from over-current, short circuit and isolation protection.

Factors such as power cable current capacity, system overload capability requirements and
short-circuit capability of the pre-stage power distribution of the equipment should be
considered when selecting protection