User manual of EC160 elevator intelligent integrated machine Installation and wiring
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and output power cable can be coupling each other to make the EMC filter out of function.
4.6.3.3 Grounding
Inverter must be grounded safely when in operation. Grounding enjoys priority in all EMC methods
because it does not only ensure the safety of equipment and persons, but also is the simplest, most
effective and lowest cost solution to EMC problems.
Grounding has three categories: special pole grounding, common pole grounding and series
grounding. Different control system should use special pole grounding, and different devices in the
same control system should use common pole grounding, and different devices connected by same
power cable should use series grounding.
4.6.3.4 Leakage current
Leakage current includes line-to-line leakage current and over-ground leakage current. Its value
depends on distributed capacitances and carrier frequency of inverter. The over-ground leakage
current, which is the current passing through the common ground wire, can not only flow into inverter
system but also other devices. It also can make leakage current circuit breaker, relay or other devices
malfunction. The value of line-to-line leakage current, which means the leakage current passing
through distributed capacitors of input output wire, depends on the carrier frequency of inverter, the
length and section areas of motor cables. The higher carrier frequency of inverter, the longer of the
motor cable and/or the bigger cable section area, the larger leakage current will occur.
Countermeasure:
Decreasing the carrier frequency can effectively decrease the leakage current. In the case of motor
cable is relatively long (longer than 50m), it is necessary to install AC reactor or sinusoidal wave filter
at the output side, and when it is even longer, it is necessary to install one reactor at every certain
distance.
4.6.3.5 EMC filter
EMC filter has a great effect of electromagnetic decoupling, so it is preferred for customer to install it.
For inverter, noise filter has following categories:
z Noise filter installed at the input side of inverter;
z Install noise isolation for other equipment by means of isolation transformer or power filter.
4.6.4 Installation specification
If user install inverter and EMI filter according to the installation guideline, we believe inverter system
comply with following compliance.
EN61000-6-4; EN61000-6-3; EN61800-3
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