CHV180 series frequency inverter special for elevator Wiring
.21.
smooth working in certain electromagnetic environment. The following is its EMC
features:
Input current is non-sine wave. The input current includes large amount of
high-harmonic waves that can cause electromagnetic interference, decrease the grid
power factor and increase the line loss.
Output voltage is high frequency PMW wave, which can increase the
temperature rise and shorten the life of motor. And the leakage current will also
increase, which can lead to the leakage protection device malfunction and
generate strong electromagnetic interference to influence the reliability of other
electric devices.
As the electromagnetic receiver, too strong interference will damage the inverter
and influence the normal using of customers.
In the system, EMS and EMI of inverter coexist. Decrease the EMI of inverter
can increase its EMS ability.
4.6.3 EMC Installation Guideline
In order to ensure all electric devices in the same system to work smoothly, this section,
based on EMC features of inverter, introduces EMC installation process in several
aspects of application (noise control, site wiring, grounding, leakage current and power
supply filter). The good effective of EMC will depend on the good effective of all of these
five aspects.
4.6.3.1 Noise control
All the connections to the control terminals must use shielded wire. And the shield layer
of the wire must ground near the wire entrance of inverter. The ground mode is 360
degree annular connection formed by cable clips. It is strictly prohibitive to connect the
twisted shielding layer to the ground of inverter, which greatly decreases or loses the
shielding effect.
Connect inverter and motor with the shielded wire or the separated cable tray. One side
of shield layer of shielded wire or metal cover of separated cable tray should connect to
ground, and the other side should connect to the motor cover. Installing an EMC filter
can reduce the electromagnetic noise greatly.
4.6.3.2 Site wiring
Power supply wiring: the power should be separated supplied from electrical transformer.
Normally it is 5 core wires, three of which are fire wires, one of which is the neutral wire,
and one of which is the ground wire. It is strictly prohibitive to use the same line to be
both the neutral wire and the ground wire
