User Manual
EM100 Mini Inverter
107
8. EMC (Electromagnetic Compatibility)
8.1 Definition
Electromagnetic compatibility is the ability of the electric equipment to run in the
electromagnetic interference environment and implement its function stably without
interferences on the electromagnetic environment.
8.2 EMC Standard Description
In accordance with the requirements of the national standard GB/T12668.3, the inverter
needs to comply with electromagnetic interference and anti-electromagnetic interference
requirements. EM100 applies the latest international standard — IEC/EN61800-3: 2004
(Adjustable speed electrical power drive systems part 3: EMC requirements and specific
test methods), which is equivalent to the national standard GB/T12668.3.
IEC/EN61800-3 assesses the inverter in terms of electromagnetic interference and
anti-electromagnetic interference. Electromagnetic interference mainly tests the radiation
interference, conduction interference and harmonics interference on the inverter (required
for the inverter for civil use). Anti-electromagnetic interference mainly tests the conduction
interference rejection, radiation interference rejection, surge interference rejection, fast and
mutable pulse group interference rejection, ESD interference rejection and power low
frequency end interference rejection.
The tests shall be conducted strictly in accordance with the above requirements of
IEC/EN61800-3, and EM100 shall be installed and used in accordance with the instruction
in 8.3 and has good electromagnetic compatibility in general industry environment.
8.3 EMC Guide
8.3.1 Harmonic Effect
Higher harmonics of power supply may damage the inverter. Thus, at some places where
mains quality is rather poor, it is recommended to install AC input reactor or current
harmonic filter.
Due to impact of harmonics, see 3.6 wiring of main circuit on input side for selecting input
leakage breaker.
8.3.2 Electromagnetic Interference and Installation Precautions
1.
The earth wires of the inverter and other electric products shall be well grounded.
2.
The input and output power cables of the inverter and weak current signal cables (e.g.
control signal cable) shall not be arranged in parallel and vertical arrangement is
preferable.
3.
The output power cables of the inverter are recommended to employ shield cables or
steel pipe shielded cables and the shielding layer shall be grounded reliably. The signal
cables are recommended to employ twisted-pair shielded control cables, and the
shielding layer shall be grounded reliably.
4.
When the length of motor cable is longer than 50 meters, the output filter or reactor is
required.