MITSUBISHI ELECTRIC FR-D700 Inverter Complete Guide

Debugging and rapid parameter setting

8.1 Basic parameter initialization

For first-time use, perform parameter initialization (set Pr.77=1, then clear the parameters to factory values through the panel). Then modify as needed:

Pr.1 upper limit frequency (maximum 0~120Hz, extended mode up to 400Hz)

Pr.2 lower limit frequency (usually 0Hz)

Pr.3 Fundamental frequency (set as the rated frequency of the motor, such as 50Hz)

Pr.7 acceleration time, Pr.8 deceleration time (unit: 0.1s, range: 0~3600s)

Pr.9 electronic thermal relay current (set as motor rated current)

Pr.79 operating mode (0=combination mode, 1=external terminal, 2=PU panel, 3=external+PU combination, etc.)

8.2 One click quick debugging

Rotate the SET knob to directly modify the frequency, and use the "MODE" button on the panel to switch monitoring modes (frequency, current, voltage, etc.). For applications that require vector control, first perform self-tuning (Pr.96=1,3 or 4), then set Pr.80=motor capacity, Pr.81=motor pole number, Pr.83=motor rated voltage, etc.

8.3 Password Protection

Setting Pr.296 and Pr.297 can lock parameters to prevent accidental modifications. 4-digit password, only by entering the correct password can parameters be modified after locking. Suitable for applications that require protection of proprietary settings.

Common fault codes and solutions

Fault code description, common causes, and solutions

E. During OC1 acceleration, the overcurrent acceleration time is too short, the motor winding is short circuited, and the mechanical jamming prolongs the acceleration time; Check the insulation resistance of the motor; Disconnect load test

E. Sudden changes in OC2 constant speed overcurrent load and increased load stability due to contactor action on the output side of the frequency converter; Prohibit switching output contactors during operation

E. OC3 deceleration overcurrent deceleration time is too short, improper configuration of braking resistor prolongs deceleration time; Check the resistance of the braking resistor

E. OV1/2/3 overvoltage deceleration time is too short, regeneration energy is too large, and the power supply voltage is too high, which prolongs the deceleration time; Install braking resistor; Check input voltage

E. THM motor overload motor long-term overload, cooling fan fault check load current; Set the correct Pr.9

E. THT frequency converter overload, insufficient frequency converter capacity, poor heat dissipation, and increased frequency converter capacity; Clean the radiator; Reduce the carrier frequency

E. FIN radiator overheating, high ambient temperature, fan damage, dust accumulation. Check the ambient temperature; Replace the fan; Clean the air duct

E. IPF instantaneous power outage, power interruption, enable automatic restart function (Pr.57) or do not handle

E. Use a megohmmeter to check the insulation of the ground fault motor or cable on the GF output side for short circuit to ground; Eliminate grounding faults

E. Check if the U/V/W terminals of the LF output phase loss motor are loose due to wire breakage and poor contact of the contactor; Measure the resistance of the motor coil

E. PUE PU communication error RS-485 wiring error, station number conflict check wiring; Confirm that the station number is unique; Reduce communication speed

During SA safety stop, the STO terminal is not powered on or the emergency stop button is pressed to restore power supply to the safety circuit; Check the emergency stop switch

No display, the frequency converter is not powered on, the power supply is not input, and the internal switch power supply is damaged. Measure the R/S/T voltage; Check the fuse; send for repair

Fault reset: After troubleshooting, it can be reset through the STOP/RESET button or external RES terminal. Before resetting faults such as overcurrent and overvoltage, it is necessary to ensure that the fault source has been eliminated.

Upgrade and replace: from FR-S500 to FR-D700

A large number of current FR-S500 series have been discontinued, and FR-D700 is the best alternative model. Attention when replacing:

Mechanical dimensions: The installation holes of FR-D700 are exactly the same as those of FR-S500 (0.75K and below), and can be directly replaced. The appearance of 1.5K and above has slightly changed, but it is still compatible with the original opening (see the external drawing for specific dimensions).

Main circuit wiring: The terminal names are basically the same (R, S, T; U, V, W), but the terminal numbers of the control circuit have changed and need to be re crimped according to the terminal definition table.

Parameter Conversion: Use the "Conversion" function of the FR Configurator software to import the original S500 parameter file (. prm) and automatically generate the parameter values corresponding to D700. After conversion, it is still recommended to manually review, especially Pr.3 (fundamental frequency), Pr.7/Pr.8 (acceleration and deceleration time), Pr.9 (electronic thermal relay), Pr.72 (carrier frequency), etc.

Functional differences: D700 has added functions such as safety stop, lifespan diagnosis, optimal excitation control, and swing frequency; At the same time, some less frequently used functions have been cancelled (such as a maximum of 15 segments for multi-stage speed). If the original S500 used these functions, alternative solutions need to be found in D700.