MITSUBISHI ELECTRIC FR-A500 frequency converter

5.1 Basic parameters (Pr.0~Pr.9)

Parameter Name Typical Setting Range and Description

Pr.0 torque increases by 0-30%. Used to compensate for low-frequency voltage drop. The standard motor is about 2-6%, and excessive current may cause overcurrent.

Pr.1 maximum frequency 0~120Hz (can be extended to 400Hz, assuming Pr.18).

Pr.2 minimum frequency 0~120Hz. Output the minimum frequency even below this frequency (note motor heating).

Pr.3 The fundamental frequency is generally set to the motor nameplate frequency (50Hz or 60Hz).

Pr.4-6 multi-stage speed setting (high/medium/low) is selected through RH/RM/RL terminal combination.

Pr.7 acceleration time 0~3600s. The time required to accelerate from 0Hz to Pr.20 reference frequency.

Pr.8 has the same deceleration time as Pr.7.

Pr.9 electronic thermal overload relay sets the rated current of the motor (A). Protect the motor from overheating.

5.2 Acceleration, Deceleration, and Braking (Pr.10~Pr.16, Pr.30, Pr.70)

Pr.10 DC braking starting frequency: usually set to 3Hz. Pr.11 braking time (0.5-10s). Pr.12 braking voltage (0-30%).

Pr.15 jog frequency: factory 5Hz. Pr.16 jog acceleration and deceleration time.

Pr.30 regeneration function selection: 0=built-in brake (≤ 7.5K); 1=External high inertia braking resistor; 2=Connect FR-HC/FR-CV.

Pr.70 special regenerative braking duty cycle: set to 10% ED when combined with Pr.30=1.

5.3 Stall prevention and protection (Pr.22, Pr.23, Pr.66, Pr.156)

Pr.22 stall prevention action level: factory 150% (relative to rated current). During acceleration, deceleration, or constant speed, if the current exceeds this value, the frequency converter will automatically adjust the frequency to prevent overcurrent tripping.

Pr.156 Stall Prevention Action Selection: Actions for acceleration, constant speed, and deceleration can be set separately, and high response current limitation can be selected (high response limitation must be turned off for vertical lifting or it may stall and fall).

5.4 Advanced Control (Pr.80, Pr.81, Pr.89, Pr.96)

Pr.80 motor capacity (0.4~55kW) and Pr.81 motor pole number (2, 4, 6...): After setting, it automatically switches to advanced flux vector control, achieving 150% starting torque at 0.5Hz.

Pr.89 speed control gain: used to adjust the speed response when the load changes.

Pr.96 offline self-tuning:

Setting 1: No rotation setting (motor does not rotate), measure the motor constant.

Setting 101: Rotation setting (the motor runs at 60Hz for about 40 seconds) for higher accuracy. Mechanical safety must be ensured before setting.

After setting normally, Pr.96 displays "3" or "103", and if abnormal, it displays "9", etc.

5.5 Communication parameters (Pr.117~Pr.124, Pr.342)

Pr.117 communication station number: 0~31.

Pr.118 communication speed: 48/96/192 (hundred bps).

Pr.119 stop bit/data length: 1=data length 8, stop bit 2; 0=Data length 7.

Pr.120 parity check: 0=none, 1=odd check, 2=even check.

Pr.121 retry count: 9999 indicates no alarm in case of communication error.

Pr.122 Communication check interval: If 0 is not set and there is no communication after this time, an E.PUE alarm will be triggered.

Pr.342 E ² PROM write selection: 0=write to E ² PROM (limited lifespan), 1=write only to RAM (power loss).

5.6 Auxiliary Function Parameters

Pr.37 Speed Display: Set the speed coefficient to display the mechanical speed (r/min) on the panel.

Pr.52 main monitoring selection: Use 0 to display frequency, 6 to display motor speed, 23 to display cumulative operating hours, etc.

Pr.73 0-5V/0-10V selection: The polarity reversal or superposition function of terminal 1 can be enabled simultaneously.

Pr.79 Operation mode selection: detailed.

Pr.251 output phase loss protection: Set to 1 to enable phase loss shutdown protection.

Fault codes and troubleshooting process

The protection functions of FR-A500 are divided into: main fault (output cut-off), minor fault (displayed but not stopped), and warning (such as stall). Common fault codes and their solutions:

Main reasons and countermeasures for panel display name

E. OC1 acceleration overcurrent acceleration time is too short, motor cable short circuit, output side contactor action prolongs acceleration time, check output wiring

E. OC2 constant speed overcurrent load mutation, motor insulation damage reduces load variation, using advanced flux vector control

E. OV1 acceleration regeneration overvoltage accelerates too quickly, causing the motor to generate electricity (such as lifting and lowering acceleration), shortening the acceleration time, and installing a braking resistor

E. OV3 deceleration regeneration overvoltage deceleration time is too short, motor energy feedback is too large, prolonging deceleration time, choose braking unit

E. THM motor overload (electronic thermal relay) motor long-term overload reduces load, check Pr.9 setting

E. THT frequency converter overload output current exceeds 150% for more than 60 seconds. Check if the load is too large and increase the frequency converter capacity

E. IPF instantaneous power outage protection for power interruption>15ms, check the power supply, enable instantaneous stop and restart (Pr.57 ≠ 9999)