Wiring of Mitsubishi frequency converters

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Wiring of Mitsubishi frequency converters It is mainly divided into two parts: main circuit wiring and control circuit wiring. The specific introductions are as follows:

### Main circuit wiring

- **Power input**: Connect the three-phase power supply's R/L1, S/L2, and T/L3 to the corresponding input terminals of the frequency converter respectively. Pay attention that the power supply voltage and frequency should match the rated parameters of the frequency converter. Make sure that the power supply is cut off before wiring.

- **Motor output**: Connect the U, V, and W three-phase output lines of the frequency converter to the U, V, and W three-phase input lines of the three-phase cage motor correspondingly. Meanwhile, connect the ground wire of the motor to the ground socket.

- **DC reactor wiring**: If it is necessary to connect a DC reactor, connect the reactor between P1 and "+", and there is a short-circuiting piece connecting "+" and P1 when it leaves the factory. When it is necessary to connect the reactor, this short-circuiting piece should be removed.

- **Brake resistor and brake unit wiring**: Connect the brake resistor to between "+" and PR, and connect the brake unit or high power factor rectifier between "+" and "-".

### Control circuit wiring - **External frequency setting**: The frequency converter provides a +5V power supply for the external frequency setting terminals. The positive terminal is terminal 10, and the negative terminal is terminal 5. The signal input terminals are terminal 2 (used for receiving voltage signals) and terminal 4 (used for receiving current signals) respectively.

- **Input control terminals**: STF is the forward rotation control terminal, STR is the reverse rotation control terminal, and RH, RM, and RL are multi-stage speed selection terminals. Different combinations of the states of these three terminals are used to achieve multi-gear speed control. MER is the output stop terminal, and RES is the reset control terminal.

- **Relay output**: It is composed of terminals A, B, and C and can be connected to an AC 220V circuit, which is used to control the start, stop, alarm and other functions of external equipment.

- **Operation status signal output terminals**: For example, the RUN operation signal of the FR-E500 series frequency converters will have a signal output when the frequency converter is running; FU is the frequency detection signal. When the output frequency of the frequency converter is within the set frequency range, there will be a signal output. Generally, it is a transistor output and can only be connected to a DC circuit below 30V.

- **Frequency measurement output terminal**: AM is an analog output terminal and can be connected to a 0 - 10V voltmeter.

- **Communication PU interface**: It is used to connect the operation panel and conduct RS-485 communication.