1 Main circuit wiring
(1) Reynolds inverter three-phase AC input terminal (R, S, T)
The power input terminal is connected to the three-phase AC power supply through the circuit breaker of the circuit breaker for line protection, regardless of the connection phase sequence. It should be noted here that the three-phase AC power supply cannot be directly connected to the output terminal of the inverter, otherwise it will cause damage to the internal components of the inverter.
(2) The output terminal of the three-phase AC output terminal (U, V, W) of the RENOLDS inverter should be connected to the motor in the correct phase sequence, if the motor direction is not right, the arbitrary two-phase in the exchange (U, V, W) can be done, and it can also be completed by setting the parameters of the inverter. It is important to note that the output cannot be connected to phase capacitors and surge absorbers.
(3) DC reactor connection terminal (DC+. P+）
The DC reactor connection terminal is connected to the DC reactor for improving the power factor, and there is a short-circuit conductor connected to the terminal, and the short-circuit conductor must be taken out first when the DC reactor is used.
Note: When a DC reactor is not used, the conductor does not need to be removed.
(4) Brake unit connection terminal (DC+. BK）
Generally, the low-power inverter (RNB300/6000.75-11kw) has a built-in braking unit (the braking resistor needs to be external), while the braking unit and braking resistor above 15kw need to be external.
(5) DC power input terminal (DC+, DC-)
The DC input terminal of the external braking unit is separated from the positive of the DC bus. Negative electrode.
(6) Ground Terminal (PE)
Leakage current occurs in Reynolds inverters, and the higher the carrier frequency, the greater the leakage current. The leakage current of the inverter is greater than 3.5mA, and the size of the leakage current is determined by the operating conditions, so it is necessary to ground the inverter and the motor in order to ensure safety.
2 Things to keep in mind
(1) The ground resistance should be less than 10Ω. The wire diameter requirements of the grounding cable should be determined according to the power of the inverter;
(2) Do not share the grounding wire with the welding machine and other power equipment;
(3) If the power supply line is shared by zero ground, consider laying the ground wire separately;
(4) If multiple inverters are grounded, they should be connected to the ground separately, and the grounding wire should not form a loop
3. Wiring of the terminal of the control loop
(1) Because the overcurrent of the low-voltage inverter control loop cable is generally very small, the size and specification of the control loop cable can be standardized.
(2) Laying of control line and main circuit cable
The control line of Reynolds inverter is separated from the main circuit cable or other power cables, and is as far away as possible from the main circuit more than 100mm; Try not to lay the main circuit cable in parallel, and not to intersperse the main circuit, when it is necessary to intersperse, the method of straight interspersing should be adopted.
(3) Shielding of cables
Reynolds drive cables can be shielded using grounded metal pipes or shielded cables. One end of the shield is connected to the common end of the inverter control circuit (com), but not to the ground end of the inverter (PE), and the other end of the shield is suspended.
(4) Switching control line
The switching control line of the Reynolds inverter does not allow the use of shielded wires, but it is necessary to twist two wires of the same signal together, and the stranding distance of the stranded wires should be as small as possible. And connect the shield layer to the ground terminal E of the inverter, and the length of the signal line cable shall not exceed 50m.
(5) Grounding of the control circuit
● The wire of the weak voltage and current circuit is grounded, and the grounding wire is not used as a circuit for transmitting signals;
● The grounding of the wire is carried out on the side of the inverter, and a special grounding terminal is used, which is not shared with other grounding terminals
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