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For your information
- We offer for this displayed device sale, exchange and repair services.
- Prices for Servo-/Spindle Drives Power Supplies are standard prices for standard repair
- Devices for sell or exchange, was preventively overhauled in our workshop.
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Detailed information about Mitsubishi Spindle Drives
We offer serial repairs for this product series
- Repair of many electronic assemblies according to standardized repair procedures with documentation.
- A larger repair capacity is possible for the same or similar orders
- Target group: machine manufacturers, service companies and distributors
Access to years of experience, specialists and equipment.
Find out more about our series repairs
Overview
- Device category: Spindle Drive Unit
- Series/Class: FREQROL-SF, 400 V class
- Design: Transistor PWM inverter, forced-air cooled, service-friendly, designed for industrial continuous load
Model designation
- FR = FREQROL series (Frequency Inverter)
- SF = Spindle Drive
- 4 = 400 V class
- 18.5K = Rated power 18.5 kW
Technical Data
| Feature | Value |
|---|
| Input voltage | 3 AC 380 – 480 V |
| Frequency | 50 / 60 Hz |
| Rated power | 18.5 kW |
| Output voltage | 3 AC variable up to 400 V |
| Output current | approx. 37 A |
| Control method | V/f control for spindle drives |
| Switching principle | Transistor PWM modulation |
| DC link voltage | DC 530 – 680 V |
| Cooling | Forced air cooling with high-performance fan |
| Weight / Dimension | approx. 45–50 kg / n. a. |
Connections & Interfaces
- R / S / T (L1 / L2 / L3): Mains input 3~400 V
- U / V / W: Output to spindle motor
- PA / PB: DC link connections / braking resistor
- SD, SE, 24, 10: Control voltage and reference potential
- STF, STR: Start signal forward / reverse
- 10, 2, 5: Analog setpoint signals (0–10 V)
- FM, AM: Frequency and current monitoring analog
- LED display: 2-digit error and status codes
Control board / Assemblies
| Type, EN | Model designation | Manufacturer No. | Quantity |
|---|
| Control board | SF-CH | BN634E266G52 | 1 |
| Communication board | SF-TL | BN624A961G52A | optional |
| Power supply | SF-PWH | n. a. | 1 |
| Power section | 18.5k | n. a. | 1 |
Description of the main assemblies:
- SF-CH control board: central signal and parameter control, communication with CNC
- SF-TL communication board (optional): interface for serial machine communication
- SF-PWH power supply: supply of the control and driver circuits
- Power section 18.5k: High-performance IGBT unit with reinforced heat sink, larger DC link and adapted driver layout
Alarms & Troubleshooting
| Code | Bezeichnung | Typischer Befund | Prüfung | Abhilfe |
|---|
| 10 | Under Voltage | Input voltage too low | Measure mains, check R/S/T | Stabilize supply |
| 12 | Memory Error 1 | Error in internal memory structure | Check voltage, reset | Check control board |
| 21 | No Signal (Encoder) | Spindle encoder no signal | Check encoder cable | Check connector / encoder |
| 22 | IC MAC I/O Error | Communication error internal | Check control board | Replace board |
| 24 | Breaker Trip | Circuit breaker tripped | Check line protection | Eliminate cause |
| 26 | Phase Loss | Phase failure detected | Check input | Correct mains connection |
| 31 | Over Speed | Spindle exceeds speed limit | Check speed signal | Correct parameter |
| 32 | Over Current (Inverter) | Overcurrent in the output circuit | Check motor cable | Check IGBT power section |
| 33 | Over Voltage | DC link voltage too high | Measure mains voltage | Check braking resistor |
| 35 | Data Error | Communication data invalid | Check CN connector | Check cable / board |
| 37 | Parameter Error | Parameter damaged | Check parameter | Reset / Re-adjustment |
| 45 | Over Heat (Amp) | Overheating power section | Check fan | Replace fan / sensor |
| 46 | Over Heat (Motor) | Spindle motor temperature protection active | Check cooling | Check motor / sensor |
| 50 | Error Excess | Position / speed deviation | Check feedback | Check encoder / controller |
| 55 | Emergency | Emergency stop | Check emergency circuit | Reset control |
Typical applications
- High-performance CNC machining centers
- Lathes with large spindle drives
- Machine tools with long operating times and high torque requirements
- Production lines in metal, plastic and wood processing
Service notes
- Clean fan and heat sink regularly
- Check DC link capacitors for capacity and ESR
- Check control board for dust, moisture and corrosion
- Test braking resistor and temperature monitoring
- Save parameters before interventions
- Do not perform insulation measurement (Megger) on the installed device
Repair description
- Input check: Visual inspection, insulation measurement, check DC link voltage, monitor function of the mains phases
- Disassembly & cleaning: Removal of the fan, disassembly of the cooling section, thorough cleaning and reapplication of thermal paste
- Analysis: Checking the IGBT unit, gate drivers, DC link capacitors and power supply
- Repair: Replacement of defective power or control assemblies, overhaul of the cooling, renewal of the electrolytic capacitors and fans
- Testing & load test: Test run on the test bench with 18.5 kW reference spindle motor, monitoring of temperature, current, voltage and protection functions
- Endurance test & conclusion: Continuous operation over several hours at rated load, measurement protocol with voltage and temperature curve, final inspection with documentation