To Next PageTo Next PageHow to solve Mitsubishi Electric FR-D720 K stall prevention (overvoltage)?
During deceleration, stall prevention (overvoltage) happens if the regenerative energy of the motor becomes excessive. To prevent overvoltage trip, increase the deceleration time using Pr. 8 Deceleration time.
Why Mitsubishi Electric Inverter stall prevention (overcurrent) occurs?
Stall prevention (overcurrent) occurs during acceleration when the output current of the inverter exceeds the stall prevention operation level. This function stops the increase in frequency until the overload current decreases to prevent the inverter from resulting in overcurrent trip. Ensure that the Pr. 0 Torque boost setting is not too large.
What causes Mitsubishi Electric FR-D720 K Inverter overload trip and how to fix it?
The inverter output stops if the temperature of the output transistor element exceeds the protection level when a current not less than the inverter rated current flows and overcurrent trip does not occur (200% or less). To resolve this, increase the acceleration/deceleration time.
What to do if Mitsubishi Electric FR-D720 K Inverter has overcurrent trip during acceleration?
If the inverter output current reaches or exceeds approximately 200% of the rated current during acceleration, the protective circuit activates and shuts off the inverter output. You can increase the acceleration time. If "E.OC1" is always lit at starting, disconnect the motor and start the inverter. Check for output short-circuit/ground fault and set 50Hz in Pr. 3 Base frequency.
General| Type | Inverter |
|---|---|
| Output Voltage | 3-Phase 200-240 VAC |
| IP Rating | IP20 |
| Input Voltage | 200-240V AC |
| Output Capacity | 0.4kW to 7.5kW |
| Power Range | 0.4 to 7.5 kW (depending on model) |
| Horsepower | 0.5HP to 10HP |
| Frequency Range | 400 Hz |
| Control Method | V/f Control |
| Overload Capacity | 150% for 60 seconds |
| Braking Unit | Built-in |
| Ambient Temperature | -10°C to +50°C (14°F to 122°F) Non-freezing. With no condensation |
| Operating Temperature | -10°C to +50°C (14°F to 122°F) |
| Storage Temperature | -20°C to +65°C |
| Humidity | 95% RH or less (non-condensing) |
| Altitude | 1000m or less above sea level |
| Enclosure Rating | IP20 |
| Cooling Method | Fan cooling |
| Protection Features | Overcurrent, Overvoltage, Undervoltage, Overheating, Short Circuit |
| Communication Options | RS-485 |
Verifies inverter model, capacity, and includes identification of components.
Details required peripheral devices like MCCBs, contactors, reactors, and optional units.
Provides instructions for safely removing and reinstalling the front and wiring covers.
Covers environmental conditions, enclosure structure, size, and layout for optimal performance.
Presents the terminal connection diagram for main and control circuits, including safety stop signals.
Details terminal arrangements for AC power input, motor output, brake units, and DC reactors.
Explains input/output signals, communication, and safety stop functions for the control circuit.
Describes connections for optional units like brake resistors, brake units, and converters.
Addresses electromagnetic interference and leakage currents, providing countermeasures for noise suppression.
Details the installation of AC reactors for power factor improvement and harmonic suppression.
Explains the importance of magnetic contactors for safety and maintenance on the input and output sides.
Discusses measures to mitigate surge voltage and protect insulation when driving 400V class motors.
Lists essential checks and precautions before operation to prevent damage or shortened lifespan.
Describes methods to ensure system safety by providing interlocks and backup systems in case of inverter failure.
Details the components and functions of the inverter's operation panel, including indicators and controls.
Provides a comprehensive list of all available parameters, their functions, setting ranges, and related pages.
Explains how to adjust torque boost, slip compensation, and stall prevention for optimal motor performance.
Covers setting maximum/minimum frequencies and avoiding resonance points through frequency jumps.
Describes how to set base frequency, voltage, and load patterns for different V/F characteristics.
Details methods for setting frequency using multi-speed operations, jog operations, and remote settings via terminals.
Explains how to configure acceleration, deceleration times, and patterns for smooth motion control.
Covers motor overheat protection, applied motor settings, and offline auto tuning for best performance.
Describes DC injection braking, regenerative braking, and various stop selection methods.
Explains how to assign functions to input and output terminals for flexible control.
Details how to display inverter status and output signals like frequency, current, and voltage.
Covers automatic restart and deceleration functions to maintain operation during power interruptions.
Explains retry functions and phase loss/earth fault detection for robust fault handling.
Describes optimum excitation control for improving motor efficiency and saving energy.
Provides techniques to reduce motor noise, EMI, and address mechanical resonance issues.
Details how to use analog signals for frequency setting and perform input calibration.
Covers functions like reset selection, parameter write protection, and password locking.
Explains how to select and switch between different operation modes (PU, External, Network).
Covers PU connector wiring, RS-485 communication settings, and communication error handling.
Details the procedures to reset protective functions and clear internal thermal relay values.
Provides a reference table of all possible fault and alarm codes displayed on the operation panel.
Lists common error messages, their causes, and recommended corrective actions.
Maps digital display characters to their actual alphanumeric representations.
Offers a systematic guide for initial checks when troubleshooting common motor or inverter issues.
Outlines daily and periodic inspection procedures to prevent faults and ensure longevity.
Explains methods for measuring electrical parameters of the inverter's main circuit.
Provides detailed electrical and mechanical specifications for various inverter models.
Lists general control specifications, operating status indicators, and environmental requirements.
Shows mechanical dimensions and panel cutouts for different inverter models.
Offers guidance for users upgrading from FR-S500 series inverters to FR-D700 series.
Details specification changes and additions made in different production revisions.
