• Install the earth leakage circuit breaker (ELB) on the input side of the inverter. • In the connection earthed-neutral system, the sensitivity current is blunt against a ground fault in the inverter output side. Earthing (grounding) must conform to the requirements of national and local safety regulations and electrical codes. (NEC • When the breaker is installed on the output side of the inverter, it may be unnecessarily operated by harmonics even if the section 250, IEC 61140 class 1 and other applicable standards) effective value is within the rating. • The following models are standard breakers:
BV-C1, BC-V, NVB, NV-L, NV-G2N, NV-G3NA, NV-2F, In this case, do not install the breaker since the eddy current and hysteresis loss will increase, leading to temperature rise. 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. 3.1.2 Countermeasures against inverter-generated EMI cause the peripheral devices to malfunction.
Though the inverter is designed to have high immunity performance, it handles Some electromagnetic noises enter the inverter to cause the inverter malfunction, and others are radiated by the inverter to 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.
Basic techniques • Do not run the power cables (I/O cables) and signal cables of the inverter in parallel with each other and do not bundle them. • 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.
Techniques to reduce electromagnetic noises that enter and cause a malfunction of the inverter (EMI countermeasures) When devices that generate many electromagnetic noises (which use magnetic contactors, electromagnetic brakes, many relays, for example) are installed near the inverter and the inverter may malfunction due to electromagnetic noises, the following countermeasures must be taken: • Provide surge suppressors for devices that generate many electromagnetic noises to suppress electromagnetic noises. • Install data line filters to signal cables (refer to page 52 ). • Ground (Earth) the shields of the detector connection and control signal cables with cable clamp metal. 50 3.
PRECAUTIONS FOR USE OF THE INVERTER 3.1 Electro-magnetic interference (EMI) and leakage currents NOTE