User Manual
EM303A General Purpose Inverter
30
The distance between output cables and signal line should
＞
30cm, and the inductive
interference will be reduced considerably, as shown in Figure 3-8.
Figure 3-8 Countermeasures Against Inductive Interference
Countermeasures Against Radio Frequency Interference (RFI)
RFI will be generated from the inverter as well as the input cable and the output cable.
Install noise filters on both input and output sides, and shield inverter with an iron
case to reduce RFI. As shown in Figure 3-9.
Figure 3-9 Countermeasures Against RFI
Cable Length Between Inverter and Motor
The longer cable between the inverter and motor is, the higher carrier frequency is, and
the greater high-frequency harmonic leakage current on its cable is. All of which will
affect inverter and its peripherals. See Table 3-2 to adjust carrier frequency for reducing
the high-frequency harmonic leakage current.
When motor cable
＞
50m, connect a special 3-phase AC reactor of the same capacity as
that of the inverter to the output terminals.
Table 3-2 Cable Length and Carrier Frequency Between Inverter and Motor
Cable Length
＜
50m
＜
100m
＞
100m
Carrier Frequency
＜
10kHz
＜
5kHz
＜
2kHz
F0-14 Function Parameter 10.000 5.000 2.000
