Inverter leakage current (with and without EMC filter)
• Install the earth leakage circuit breaker (ELB) on the input side of the inverter.
• In the
Earthing (Grounding) must conform to the requirements of national and local safety regulations and electrical codes. (NEC
section 250, IEC 61140 class 1 and other applicable standards)
• When the breaker is installed on the output side of the inverter, it may be unnecessarily operated by harmonics even if the
effective value is within the rating.
In this case, do not install the breaker since the eddy current and hysteresis loss will increase, leading to temperature rise.
• The following models are standard breakers: BV-C1, BC-V, NVB, NV-L, NV-G2N, NV-G3NA, NV-2F, earth leakage relay
(except NV-ZHA), and NV with AA neutral wire open-phase protection.
The other models are designed for harmonic and surge suppression: NV-C/NV-S/MN series, NV30-FA, NV50-FA, BV-C2,
earth leakage alarm breaker (NF-Z), NV-ZHA, and NV-H.
Countermeasures against inverter-generated EMI
Some electromagnetic noises enter the inverter to cause the inverter malfunction, and others are radiated by the inverter to
cause the peripheral devices to malfunction. Though the inverter is designed to have high immunity performance, it handles
low-level signals, so it requires the following basic techniques. Also, since the inverter chops outputs at high carrier frequency,
that could generate electromagnetic noises. If these electromagnetic noises cause peripheral devices to malfunction, EMI
countermeasures should be taken to suppress noises. These techniques differ slightly depending on EMI paths.
• Do not run the power cables (I/O cables) and signal cables of the inverter in parallel with each other and do not bundle
• Use shielded twisted pair cables for the detector connecting and control signal cables and connect the sheathes of the
shielded cables to terminal SD.
• Ground (Earth) the inverter, motor, etc. at one point.
3. PRECAUTIONS FOR USE OF THE INVERTER
3.1 Electro-magnetic interference (EMI) and leakage currents
connection earthed-neutral system, the sensitivity current is blunt against a ground fault in the inverter output side.
Leakage current Ig1 (mA)
Leakage current Ign (mA)
Leakage current Igi (mA)
Leakage current Ig2 (mA)
Motor leakage current Igm
Total leakage current (mA)
Rated sensitivity current (mA)
(≥ Ig × 10)
Input power conditions
220 V/60 Hz (200 V class) or 440 V/60 Hz
(400 V class), within 3% of power supply
for harmonic and
0 (without noise filter)
1 (without EMC filter)
For the leakage current of the inverter, refer to
the following table.