Before installing the inverter, you must make sure the installation environment, and then use the proper installation method. When wiring the inverter, you must make the correct connection between the main circuit and the control circuit, let's take a look at the details below.

First,Installation requirements of frequency converter

1, the installation of the inverter environment

(1) ambient temperature-10 ° C-40 ° C; 

(2) ambient humidity, the relative humidity is not more than 90% (no condensation) ; 

(3) other conditions, no direct sunlight, no corrosive gas and flammable gas, less dust, less than 1000m above sea level.

2, the installation of the inverter

(1) wall-mounted installation: the distance between the inverter and the surrounding objects should meet the conditions: both sides ≥100mm up and down ≥150mm; 

(2) Cabinet-type installation: single inverter should be installed outside the cabinet cooling mode as far as possible (when the environment is relatively clean, less dust) ; single inverter cooling mode used in the cabinet, should be installed on the top of the cabinet ventilation cooling fan, and as far as possible installed directly above the inverter, multi-inverter installation should be parallel installation, if it must be installed in a longitudinal way, should be installed between the two converters partition. Either way, the inverter should be installed vertically.

Second, the wiring of the inverter

1,Main circuit wiring

(1) the input (R, S, T) output (U, V, W) of the inverter must not be connected wrong; 

(2) the main circuit path selection

• the wire diameter selection method of the power supply and the inverter wiring and the same capacity motor is the same, 
• the voltage drop △ U should be considered in the wiring between the inverter and the motor, general Requirements: △ U ≤(2-3)% UN △ U calculation formula is: (not copied) formula: Imn-motor rated current (a) R 0-unit length (m ω/m) wire resistance (m ω/m) , the length of l-wire (m) nominal cross-sectional area/1.01.52.54.06.010.016.025.035.0/(m ω/M)17.811.96.924.402.921.731.100.690.49    table: the unit length resistance of motor lead-out wire

(1) shielding wire should be used in analog control line, one end of which is connected to the common end (COM) of converter control circuit, not to the ground end (E) or the earth, and the other end is suspended. 

(2) the switch quantity control line may not use the shielding line, but the two wires of the same signal must be twisted together.

3. The earthing of inverter

Multi-inverter grounding, each inverter should be connected to Earth, do not allow one inverter to ground and another inverter to ground after the connection. Improve the power factor of inverter, add DC reactor and AC reactor. In addition to improving the power factor, the following functions can be achieved:

(1) to suppress the inrush current in the input; (2) to reduce the influence of the power supply voltage imbalance.

The selection of reactance: 1) reactor voltage drop not more than 3% of the rated voltage; 2) when the transformer capacity more than 500KVA or transformer capacity more than 10 times the capacity of the inverter, should be equipped with reactor.

Source: internet (for study only, intrusion and deletion)