The User Manual of 580 Series General Frequency Converter

2.4.1 Operating instructions of peripheral electrical elements

Table 2-2 The operating instructions for peripheral electrical elements of 580 frequency converter

Accessories	Installation site	Functions
Air switch	The front end of input loop	Break current when the downstream equipment is in overcurrent
Contactor	Between input side of air switch and input side of frequency converter	For power on/off of frequency converter, it is not allowed to use the contactor to power on or power off the frequency converter (Less than twice per minutes) or to start the frequency converter directly.
AC input electric reactor	Input side of frequency converter	Increase the power factor of input side; Eliminate higher harmonic in the input side and prevent that the equipment is damaged due to wave distortion of voltage; Eliminate input current imbalance resulting from phase imbalance of power supply.
EMC input filter	Input side of frequency converter	Reduce external conduction and radiated interference of the frequency converter; Reduce the conducted interference from power supply to the frequency converter and improve the anti-interference capacity of frequency converter.
DC reactor		Increase power factor in the input side; Improve the efficiency and thermal stability of the whole frequency converter Effectively eliminate the influence of higher harmonic in the input side on the frequency converter and reduce external conduction and radiated interference.
AC output reactor	Between output side of frequency converter and the motor. Installation nearby the frequency converter	The output side of frequency converter generally contains many higher harmonics. When the motor is far from the frequency converter, there is high capacitance distributed in the circuit. Therein, some harmonic may result in resonance in the loop and has an influence on two aspects: ◆　Damage insulation performance of the motor and damage the motor in a long time. ◆ Generate large leakage current and cause the frequent protection of frequency converter. When the frequency converter is 100m away from the motor, the output AC electric reactor shall be installed additionally.

1) It is not allowed to install the capacitor or the surge suppressor in the output side of frequency converter, or else, the frequency converter may be in failure or the capacitor and the surge suppressor will be damaged.

2) The input/output of frequency converter (main loop) contains harmonic and may disturb communication equipment attached to the frequency converter. The interference filter is thus installed to minimize interference.

3) See Chapter 8 Selection of peripheral equipments for the detailed information of peripheral equipments and options.