The User Manual of 580 Series General Frequency Converter

3.2.2 The wiring of main loop of frequency converter

Fig. 3-16 Single 0.75-2.2kW wiring standard Fig. 3.17 Three-phase 0.75-15kW wiring standard

Fig. 3.18 Three-phase 18.5kW-30kW and Fig. 3.19 Three-phase 37-90KW

110KW above wiring standard
Attentions in wiring:

1) Input power L1 and L 2 (Any two lines among Line R, Line S and Line T) or R, S and T:

● For input side wiring of frequency converter, there is phase sequence requirement.

● External power wiring specification and installation mode shall conform to local law and regulations as well as IEC standard requirements.

● The standard input reactor is set in the frequency converter above 110KW, thus, there is no DC reactor port.

2) DC bus (+), (-):

● There is residual voltage at Terminal (+) and Terminal (-) of DC bus when the power is off. Please make sure that the wiring is started after the power is off for 10 minutes, or else, the electric shock may occur.

● When outlaid braking subassembly is selected for 18.5kW, it is required that positive electrode or negative electrode shall not be connected in an inappropriate way, or else, the frequency converter may be damaged or the fire may occur.

● The wiring length of braking unit shall not be more than 10m and it is required to use the twisted pair or compact double lines.

● It is not allowed to connect the brake resistance to DC bus directly, or else, the frequency converter may be damaged and even the fire may occur.

3) The terminal block (+), PB of brake resistance

● Only when the model is below 18.5kW and the built-in braking unit of the model has been confirmed, the terminal block of braking unit will be effective.

● The brake resistance shall be selected according to the recommended value and its wiring distance shall be less than 5m, or else, the frequency converter may be damaged.

4) Terminal block P1 and (+) of the outlaid reactor:

● If 37kW frequency converter and the electric reactor are outlaid, the connection plate between Terminal P1 and Terminal (+) shall be removed in assembly and the electric reactor shall be connected between two terminals.

5) Output side U, V, W of frequency converter:

● The external power wiring and installation mode shall conform to local law and regulations as well as relevant IEC standard requirements.

● The output side of frequency converter shall not be connected to the capacitor or the surge absorber, or else, the frequent protection and even damage of the frequency converter may be caused.

● When the motor cable is too long, the electrical resonance may be caused due to the influence of distributed capacitance so that the dielectric breakdown of motor may occur or there will be large leakage current to make frequency converter in overcurrent protection. When the motor cable is longer than 100m, DC output reactor shall be additionally installed nearby the frequency converter.

6) Ground terminal PE:

● The terminal must be grounded reliably and the resistance of ground wire must be less than 0.1Ω, or else, the equipment may be in failure and even damaged.

● It is not allowed to use ground terminal with the Terminal of null line of power supply together.

● The resistance of protective grounding conductor shall bear the possible large short-circuited current when there is a failure.

● The size of protective grounding conductor shall be selected according to the following table.

Sectional area of a phase line (S)	Minimum sectional area of the protective lead (Sp)
S≤16mm^2	S
16mm^2＜S≤35mm^2	16mm^2
35mm^2＜S	S/2

● The protective grounding conductor must be the cable in yellow and green.

7) The requirements for preceding protective device

● An appropriate protective device shall be installed on the input distribution circuit additionally and the protective device shall provide overcurrent protection, short-circuit protection, insulation blocking and other functions.

● The current capacity of power cable, overload capacity requirement of the system, short-circuit capacity of preceding power distribution for the equipment and other functions shall be considered when the protective device is selected. Please select the recommended value according to the recommendation table in Section 8.4.