MITSUBISHI ELECTRIC FR-S520E - Manual (Page 25)

15
Main circuit terminals
1
WI
RING
CAUTION
•The earth (ground) leakage circuit breaker should be installed to the primary
(power supply) side of the inverter.
•In the connection neutral point earthed (grounded) system, the sensitivity
current becomes worse for earth (ground) faults on the inverter secondary
side. Earthing (grounding) must conform to the requirements of national and
local safety regulations and electrical codes. (JIS, NEC section 250, IEC 536
class 1 and other applicable standards)
•When the breaker is installed on the secondary side of the inverter, it may be
unnecessarily operated by harmonics if the effective value is less than the
rating. In this case, do not install the breaker since the eddy current and
hysteresis loss increase and the temperature rises.
•General products indicate the following models: BV-C1, BC-V, NVB, NV-L, NV-
G2N, NV-G3NA, NV-2F, earth (ground) leakage relay (except NV-ZHA), 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 (ground) leakage alarm
breaker (NF-Z), NV-ZHA, NV-H