3. Installation of Frequency Inverter
EM15 User’s Manual
18
Input AC
reactor or DC
reactor
Installation Location:
Frequency inverter input side / near the frequency inverter
The inverter power supply capacity is more than 600kVA or 10 times of the inverter capacity.
If there is switch type reactive-load compensation capacitor or load with silicon control at the
same power, there will be high peak current flowing into input power circuit, causing the
damage of the rectifier of frequency inverter.
When the voltage unbalancedness of the three-phase power supply of the inverter exceeds 3%,
the rectifier component will be damaged.
It is required that the input power factor of the inverter shall be higher than 90%.
When the above situations occurred, install the AC reactor at the input side of the inverter or
DC reactor to the DC reactor terminal.
Input noise filter
Installation Location:
The frequency inverter input side
To reduce the noise input from the power to the inverter or output from the inverter to the
power.
Thermal
protection relay
Installation Location:
The output side of frequency inverter
Although the inverter has motor overload protection function, when one inverter drives two or
more motors or multi-pole motors, to prevent the motor over-temperature failure, thermal
protection relay shall be installed between the inverter and each motor.
Output filter
Installation Location:
The output side of frequency inverter
When the output side of the inverter is connected with output filter, the conduction and
radiation interference can be reduced.
Output AC
reactor
Installation Location:
Between the output side of frequency inverter and motor, near the
frequency inverter
When the cable connecting the inverter and the motor is longer than 50 meters, it is suggested
to install AC output reactor to suppress the high-frequency oscillation to avoid the damage to
motor insulation, large leakage current and frequent inverter protective action.
3.5 Model Selection of Main Circuit Peripheral Devices
Table 3-2 Model Selection Diagram of Main Circuit Peripheral Devices (Recommended)
Frequency inverter
Model
MCCB
(A)
Contactor
(A)
Cable of Input Side
Main Circuit
(mm2)
Cable of Output Side
Main Circuit
(mm2)
Cable of Control
Circuit
(mm2)
Single-phase 220V
EM15-G1-d75
16
10
2.5
2.5
1.0
EM15-G1-1d5
20
16
4.0
2.5
1.0
EM15-G1-2d2
32
20
6.0
4.0
1.0
Three-phase 220V
EM15-G2-d75
16
10
2.5
2.5
1.0
EM15-G2-1d5
16
10
2.5
2.5
1.0
EM15-G2-2d2
25
16
4.0
4.0
1.0
EM15- G2-004
32
25
4.0
4.0
1.0
EM15- G2-5d5
63
40
4.0
4.0
1.0
EM15- G2-7d5
63
40
6.0
6.0
1.0
EM15- G2-011
100
63
10
10
1.0
EM15- G2-015
125
100
16
10
1.0
EM15- G2-018
160
100
16
16
1.0
