Mitsubishi Electric FR-A840-22K-1 FR-A800 Series Variable Frequency Drive

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Manufacturer: Mitsubishi Electric
Product No.: FR-A840-22K-1
Country of origin:United States
Product Type: Variable Frequency Drives
Payment: T/T, Western Union
Weight: 16000g
Shipping port: Xiamen
Warranty: 12 months

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Description

Delivering precise speed and torque regulation for heavy-duty industrial machinery, the Mitsubishi Electric FR-A840-22K-1 is a high-performance three-phase 400V class variable frequency drive designed for motors up to 22 kW. As part of the flagship FR-A800 series, this inverter features an integrated FM pulse train output terminal (Terminal FM) for exact system monitoring and coordination. Equipped with advanced Real Sensorless Vector Control and built-in PLC capabilities, this drive optimizes motor performance in demanding dynamics across complex automation networks.

Features

Advanced Control Algorithms: Supports Real Sensorless Vector Control, Vector Control, V/F Control, and Advanced Magnetic Flux Vector Control.
Flexible Overload Ratings: Dual-specification ratings optimize the inverter for both light-duty (LD) and normal/heavy-duty (ND/HD) operating environments.
Embedded PLC Functionality: Allows custom logic control, input/output configuration, and localized sequencing directly on the drive without external controller hardware.
Integrated Safety Function: Features Safe Torque Off (STO) emergency stop capabilities complying with EN ISO 13849-1 Category 3 / PLd and IEC 61508 SIL2.
Comprehensive Connectivity: Standard RS-485 interface supporting Modbus-RTU protocol alongside multiple optional network expansion card slots.

Applications

Hoisting and Cranes: High-starting torque execution and mechanical brake sequencing for safe, vertical lift controls.
Extruders and Mixers: High torque stability at ultra-low speeds to prevent material clotting and mechanical stalls.
High-Inertia Fans and Blowers: Smart deceleration control and catch-on-the-fly functionality for spinning loads.
Winding and Tension Systems: Real-time torque limiters and precise speed regulation for continuous web handling.

Technical Specifications

Manufacturer	Mitsubishi Electric
Model Reference	FR-A840-22K-1
Applicable Motor Capacity	22 kW
Output Capacity	34 kVA
Rated Output Current	44 A
Output Rated Voltage	Three-phase 380 to 500 V
Input Voltage Class	Three-phase 400 V class (380 to 500 V, 50/60 Hz)
Monitoring Terminals	Terminal FM (Pulse train output)
Serial Communications	RS-422, RS-485, RS-232 (RJ45 connection)
Safety Certification	CE, UL, cUL, RoHS compliant
Product Dimensions	400 mm (H) x 250 mm (W) x 190 mm (D)
Shipping Weight	16.0 kg

Connections and Interfaces

Terminal Group	Function & Terminal Assignment
Power Input	R/L1, S/L2, T/L3: Connects to three-phase commercial AC power supply.
Inverter Output	U, V, W: Direct connection to three-phase induction or PM motors.
Analog Control	Terminal 10 (DC 10V supply), Terminal 2 (0-5V / 0-10V input), Terminal 4 (4-20mA input), Terminal 5 (Analog common).
Pulse Output	Terminal FM: High-speed transistor pulse train output mapped to operational variables.
Digital Inputs	STF (Forward rotation start), STR (Reverse rotation start), SD (Contact input common).

Empirical Engineering Insights

Alternative Models & Compatibility

The FR-A840-22K-1 directly succeeds the older FR-A740-22K series. It shares similar mounting footprint spacing; however, check clearance depth due to the cooling fan assembly design. If migrating parameters using FR Configurator2 software, note that Parameter 54 (FM terminal function selection) must be carefully calibrated as the pulse train output characteristic curve may require scaling adjustments to match legacy analog panel meters.

Application Pitfalls & Engineering Notes

When running this drive in low-speed, high-torque configurations (such as continuous extrusion or winding), motor overheating is possible due to reduced native fan cooling. Under these conditions, specify an inverter-duty motor with independent force-cooling and configure Parameter 9 (Electronic thermal O/L) to match the external cooling profile. Additionally, if the system triggers E.OV3 (Overvoltage during deceleration) faults during cycling, ensure a dynamic braking resistor is installed and Parameter 30 (Regenerative function selection) is enabled.

Commissioning & Wiring Tips

To avoid electromagnetic interference with low-voltage sensor cables, ensure the motor cables are shielded and correctly grounded via a 360-degree high-frequency ground clamp at the cabinet entry plate. If establishing multi-drop RS-485 control via the integrated RJ45 ports, toggle the termination resistor slide switch (located behind the main control panel) to the "100 ohm" position only on the final physical node of the network bus.

Installation Guidelines

CRITICAL WARNING: ELECTRICAL DISCHARGE RISK

Isolate all primary three-phase electrical input feeds before attempting installation or terminal wiring. Internal DC bus capacitors contain lethal residual charge. Wait at least 10 minutes after disconnecting incoming mains power and verify the voltage across terminals P/+ and N/- is under 45 VDC using a calibrated multimeter before initiating maintenance operations.

Mechanical Mounting: Mount the drive vertically in a clean, dust-controlled electrical cabinet. Ensure a minimum clearance of 50 mm on both sides and 100 mm above and below the chassis for adequate airflow and thermal convection.

Power & Motor Wiring: Connect the three-phase utility supply to inputs R/L1, S/L2, and T/L3. Route shielded motor cables to terminals U, V, and W, grounding the shield on both the drive ground plate and the motor housing.

I/O Configuration: Wire the start commands (STF/STR) and emergency stop (STO) safety circuit. Configure terminal FM to the desired monitoring target via parameter mappings using the built-in operating panel or PC commissioning tool.

Key Features:

#FR-A800 Series #Variable Frequency Drives

What does the -1 suffix indicate on the FR-A840-22K-1 VFD?

The -1 suffix designates that the drive is configured with an FM-type control terminal block. This block utilizes a pulse train output (via Terminal FM) for operational frequency or current monitoring, as opposed to the analog voltage output (AM terminal) configuration.

How can I resolve an E.THT fault on this variable frequency drive?

E.THT indicates an inverter-side electronic thermal overload. This occurs when the output current exceeds the rated threshold for too long. Check for physical mechanical blockages in the driven machinery, verify your acceleration curve times, and ensure the load matches the drive's output rating.

Does this drive support permanent magnet (PM) motor control?

Yes. The FR-A800 series is compatible with both standard induction motors and permanent magnet (PM) motors. You must adjust Parameter 99 (Motor selection) and execute an offline auto-tuning sequence to establish the correct magnetic profile.

What is the function of the STO circuit on this unit?

The Safe Torque Off (STO) circuit directly cuts power to the drive's internal gate-drive signals, safely disabling output torque to prevent accidental motor startups. This mechanism meets PLd and SIL2 safety standards and bypasses output contactor requirements.

Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

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Mitsubishi Electric FR-A840-22K-1 FR-A800 Series Variable Frequency Drive