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MITSUBISHI FREQROL Z200 Inverter
Brand: MITSUBISHI -
Cat: Servo Drive
Code:FR-Z220-3.7K
| Combination name | Availability | Price |
|---|---|---|
FREQROL-Z200 Variable Frequency Drive (Inverter) – Mitsubishi FR-Z220-3.7K
The FR-Z220-3.7K is a PWM variable frequency drive (“AC Inverter Drive” / “Variable Frequency Drive”) from the FREQROL-Z200 series, manufactured by MITSUBISHI Electric, rated at 3.7 kW in the 200–230 V AC three-phase voltage class. The unit is documented on CNC machining centres, milling machines and lathes equipped with Mitsubishi drives from the 1980s–1990s. It controls the connected three-phase induction motor via V/f (volts-per-hertz) regulation, varying output frequency and voltage to achieve continuous speed adjustment. Some variants within the Z200 series include a dynamic braking resistor terminal and analogue speed reference input on the control terminal block.
The variable frequency drive converts mains AC power into a three-phase, variable-frequency supply, enabling continuous speed control of the connected induction motor (spindle or feed axis). Without this unit the motor would run only at fixed mains frequency, making any CNC speed control impossible: failure typically presents as an immediate spindle stop, drive fault alarms on the operator panel, or failure to reach the programmed speed — halting production instantly.
MITSUBISHI Electric is one of the world’s leading manufacturers of industrial automation and motion control; its Factory Automation division has produced the FREQROL inverter family for over four decades across continuously evolving series (FR-A, FR-E, FR-F, FR-D, FR-CS). The FREQROL-Z200 series belongs to the 1980s–1990s generation and is legacy / discontinued: official support has ended and spare parts are available only as used, NOS surplus, or through specialist repair services.
Main Technical Specifications
| Type | AC PWM Variable Frequency Drive (Inverter) |
| Part number | FR-Z220-3.7K (FRZ22037K) |
| Brand | MITSUBISHI Electric – FREQROL-Z200 series |
| Known application | CNC machine tools (machining centres, milling machines, lathes) with Mitsubishi drives, 1980s–1990s |
| Function | AC induction motor speed regulation via variable frequency and voltage (V/f control) |
| Rated power | 3.7 kW |
| Input voltage | 3-phase 200–230 V AC, 50/60 Hz |
| Output voltage | 3-phase 0–220 V AC variable |
| Rated output current | ~17.5 A (typical for 3.7 kW / 200 V class) |
| Output frequency range | 0.5–120 Hz (typical Z200 series) |
| Speed reference input | Analogue ±10 V (typical); multi-step digital inputs |
| Interfaces | Power terminal block (R/S/T, U/V/W, P/B); control terminal block with digital and analogue I/O |
| Weight | ~3–6 kg |
| Dimensions | ~220–320 mm H × 130–190 mm W × 130–170 mm D |
| Production status | Legacy / discontinued — used/surplus/repair only |
