Shenzhen Hpmont Technology Co., Ltd.
Chapter 1 Safety Information and Precautions
HD3N Series User Manual V1.1
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Change three-phase input to single-phase input
For three-phase input inverter, users should not change it to be single-phase input.
To use single-phase power supply, disable the input phase-loss protection function. And the bus-
voltage and current ripple will increase, which not only influences the life of electrolytic capacitor but
also deteriorates the performance of the controller. In that case, the controller must be derating and
should be 60% within rated value of controller.
Lightning surge protection
HD3N internal design has lightning surge over-current protection circuit, and has certain self-
protection capacity against the lightning.
Altitude and derating
In area where altitude exceeds 1000 meters, HD3N should be derating since the heatsink efficiency will
be reduced because of the tenuous air.
The rated value of output current derates by 1% for each 100m increase of the altitude. I.e for the
altitude of 4000m, derated rate is 30% for rated current of HD3N. Figure 1-1 is the derating curve of
rated current and the altitude.
Figure 1-1 Derating curve of rated current and altitude
70%
100%
1000m
4000m
Altitude
Rated current of HD3N
1
