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2.
Introduction of Shihlin Inverter
Introduction of Inverter
Commonly signal wire (weak) and power lines (heavy) are in control cabinet, to inverterr, electric
line of force divided into
incoming lines and tail wire.
In wiring, signal wire and power lines should
distributed in different regions, in close (within 20cm),
parallel lines and interlace lines are
unallowed strictly, and the two cannot be tied together.
If the signal cable must pass through between
power lines, the two should maintain a 90 degree Angle.
The parallel lines and interlace lines which
of power line can not crisscross wiring or be tied together, especially in occasions which noise filter
installed, it will make coupled noise when the electromagnetic noise through the distributed
capacitance, thus noise filter will out of action.
Generally the same controller with different electric equipment, such as inverter, filter, PLC,
measurement instrument, its transmitter electromagnetic noise to external and bear ability each are
not identical, this requires to classify these equipments, the classification can be divided into strong
noise quipment, and noise sensitive equipment, the similar equipmentmust be installation in the same
area, inhomogeneity equipment must be keep distance more than 20cm.
2.
Input noise filter, input and output magnet ring (zero phase reactor)
Increase noise filter in the input
terminal, which will isolate the inverter and the other equipment can
effectively reduce the conduction and radiation ability.
Install the input reactor this synopsis
recommendation, can satisfy the limits value of conduction and radiation which CE declared. In the
input and output terminal increased the ferrite lateral auxiliary will be better effect.
3. Shield
Good shielding and grounding can greatly reduce the interference of inverter, and can improve the
anti-interference ability of the inverter. Using the good conduct electricity
sheet metal sealing, and let
the sheet metal grounding, can satisfy the limits value of radiation which CE declared.
4. Grounding
Inverter at work must be safe and reliable grounding. Grounding is not only for equipment and safety,
but also is the simplest, the most efficient and the lowest cost method to solving the EMC problem,
should be prioritized. Please refer to the "terminal wiring" section.
5. Carrie Wave
The leakage current contains the leakage current from line to line or
over the ground. It depends on
the size of the capacitance and the carrier frequency of the wiring system. The carrier frequency is
higher, the motor cable is longer, the cable cross-sectional area is larger, and the leakage current is
larger too.
Reduce the carrier frequency can effectively reduce the leakage current, when a long line
of motor (50m above), the output side should be installed ac reactor or sine wave filter, when the
motor line is longer, every distance should to install a reactor.At the same time, reduce carrier
frequency can effectively reduce the conduction and radiation interference, in 2K carrier frequency,
can satisfy the limits value of the conduction and radiation which CE declared.
