MITSUBISHI ELECTRIC FR-A500 frequency converter

Wiring selection (75 ℃ copper cable):

0.4K~2.2K: 1.5mm ² cable, 4mm crimping terminal, tightening torque of 1.5 N · m.

5.5K~7.5K：3.5~5.5mm²， Tightening torque of 2.5 N · m.

High power range (above 30K): 60-150mm ², tightening torque 8-24 N · m.

Important precautions:

The power cord must be connected to R, S, T, and it is strictly prohibited to connect it to U, V, W, otherwise the frequency converter will be immediately damaged.

The total wiring length on the output side should not exceed 500m. If it is too long, it will generate excessive charging current, which may trigger overcurrent protection by mistake. Suggestion: Non low noise mode 300m (≤ 0.4K), 500m (≥ 1.5K); Low noise mode 200m (≤ 0.4K), 300m (≤ 0.75K), 500m (≥ 1.5K).

All main circuit wires must pass through anti cutting sheaths (wiring covers for 22K and below models).

3.2 Control Circuit Wiring

The control circuit terminals are divided into: input signal, output signal, analog signal, and communication interface.

Input signal (24VDC optoelectronic isolation):

STF/STR: Forward/Reverse Start Signal.

RH/RM/RL: Multi speed selection (high/medium/low speed).

JOG: Jog mode selection.

RT: Second acceleration and deceleration time selection (simultaneously activating second torque boost, second V/F, etc.).

AU: Current input selection (4-20mA frequency command is valid).

MRS: Output stopped (immediately turn off the inverter pulse).

RES: Reset (clear protection in case of fault).

CS: Instant stop and restart selection (to be used in conjunction with Pr.57).

SD: Input common terminal (drain logic). The factory is designed for drain logic, and the jumper can be changed to switch to source logic.

Output signal (open collector electrode, 24VDC/0.1A):

RUN: Running signal (ON when frequency ≥ startup frequency).

SU: Arrival frequency signal (output frequency is ON within the range of ± Pr.41 of the set frequency).

OL: Overload alarm (ON when stall prevention is activated).

IPF: Instantaneous power outage/undervoltage signal.

FU: Output frequency detection (ON when frequency ≥ Pr.42 is set).

SE: Output common terminal.

Analog input:

10/10E: 5V/10V power supply (10mA) for frequency setting potentiometer.

2: Voltage frequency command (0-5V or 0-10V, input resistance 10k Ω).

4: Current frequency command (4-20mA, input resistance 250 Ω, AU signal ON required).

1: Auxiliary frequency input (± 5V or ± 10V, used for superposition or bias).

5: Simulate common terminal (not grounded).

Analog output:

FM: Pulse output (1440 pulses/second @ full range, calibratable), used for frequency meters.

AM: 0-10V analog output (configurable monitoring item).

PU interface (RS-485):

RJ45 socket, communication parameters up to 19200bps, maximum distance 500m, supports 1: N connection (up to 32 units). Pins 2 and 8 are 5V power supplies and are only for use on the operation panel. They should not be used for communication.

Notes:

The control line should use 0.75mm ² shielded twisted pair and be routed separately from the main circuit cable (distance ≥ 30cm).

Improving the control logic (drain/source) requires moving the jumper on the back of the control circuit terminal block and can only be operated when the power is off.

Operation panel and operating mode

FR-A500 comes standard with FR-DU04 simple operation panel and optional FR-PU04 full parameter unit. The panel consists of 5 buttons, 4 LED lights, and 5 status indicator lights.

4.1 Operating Mode

Set the operating mode through Pr.79 "Operation Mode Selection":

Description of Set Value Mode

When the power is turned on, the external mode can be switched to PU mode through the panel

The frequency and start stop of PU operation mode are completely controlled by the operation panel

The frequency of the external operating mode is set by an external potentiometer/4-20mA, and the start stop is controlled by terminals STF/STR (factory setting)

3 External/PU Combination Mode 1: The frequency is set by the panel, and the start stop is controlled by the terminal

4 External/PU Combination Mode 2 Frequency given by external, start stop controlled by panel FWD/REV key

5 program running modes automatically run according to the preset schedule (Pr.200-Pr.231 needs to be set)

During operation, it is possible to switch between PU, external, and communication modes

7 External mode (PU interlock) allows switching to PU mode when X12 signal is ON

8 external signal switching mode X16 signal selection external or PU mode

Pre startup inspection:

Confirm that the POWER light is on and there is no ALARM light.

After the first power on, parameter initialization (Pr.77=1 or parameter clearing) or factory reset should be performed, and then reset according to the application.

4.2 Frequency Setting and Monitoring

In PU mode, press the MODE key to enter the frequency setting mode, use the ▲/▼ keys to modify the frequency, and press the SET key for 1.5 seconds to write. In monitoring mode, it can cyclically display: output frequency → output current → output voltage → alarm history. The main display content (such as operating speed, motor torque, power, etc.) can be changed through Pr.52.

Guidelines for Setting Core Parameters

The FR-A500 has hundreds of parameters, and the following are the most commonly used and essential parameters that must be understood.