DRIVE AC SERVO
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- 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 Yaskawa CACR Servopacks
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
The Yaskawa CACR-SR07BB1BM is a reliable AC servo amplifier of the proven SR series. These amplifiers have been used for decades in machine tools, automation systems, and handling systems, characterized by robust power sections, analog control technology, and very clear fault diagnostics via a 7-segment display. The SR07 model belongs to the 750 W power class and is particularly suitable for dynamic feed and auxiliary axes.
Overview
- Device category: AC Servo Amplifier (Speed Control Type)
- Series/Class: CACR-SR, 200 V class, 0.75 kW class
- Design: solid industrial housing, service-friendly architecture
Model Designation
- CACR = Yaskawa AC Servo Drive / Servopack
- SR = SR Series (Predecessor of the Sigma Series)
- 07 = Power class approx. 0.75 kW (750 W motor)
- B = Function/design variant of the series
- B = additional sub-variant (specification within the SR family)
- 1 = Power supply 200–230 V AC (single/three-phase)
- BM = Special or OEM configuration, machine-specific functions or parameters may be set ex works
Technical Data
| Feature | Value |
|---|
| Rated power | approx. 750 W |
| Supply | AC 200–230 V, 50/60 Hz |
| Input current | approx. 4–5 A (depending on load and application) |
| Output | 3-phase PWM output (U/V/W) |
| Control type | Analog speed control (±10 V) |
| Feedback | Incremental encoder or tacho feedback (motor dependent) |
| Protection functions | Overcurrent, overload, overvoltage, undervoltage, overheating |
| Braking/Regeneration | External regenerative resistor via B1/B2 |
| Cooling | Natural convection / cabinet ventilation required |
| Weight/Dimensions | n. a. |
Connections & Interfaces
- R/S/T: Mains input 200–230 V AC
- U/V/W: Motor output
- B1/B2 (RB): Connection for external braking/regenerative resistor
- PE: Protective earth connection
- Control terminals (CN1):
- ±10 V speed reference
- Servo-ON / Enable
- Alarm/Ready signals
- Monitor outputs for torque / speed
- Encoder/Tacho feedback: Feedback connection from the motor
- 7-segment display: Fault diagnostics with codes 1–8
Control Board / Assemblies
- Control board: Controller, analog processing, protection logic
- Power output stage: DC link, transistor output stage, rectifier
- Regeneration module: Brake chopper and resistor monitoring
- Power supply section: internal auxiliary voltages
- Thermal section: Heat sink monitoring
Alarms & Troubleshooting
| Code | Designation | Typical Finding | Check | Remedy |
|---|
| 1 | Over-current | Short circuit motor/output stage, defective transistors | Check U/V/W, insulation measurement | Repair power section, check motor |
| 2 | Circuit protector tripped | MCCB/fuse triggered | Check mains input | Fix short circuit, switch on correctly |
| 3 | Regenerative trouble | Brake resistor defective/missing, chopper disturbed | Check RB terminals, measure resistance | Connect/replace resistor, repair chopper |
| 4 | Over-voltage | DC link too high | Measure mains voltage | Stabilize mains, optimize braking ramps |
| 5 | Overspeed | Setpoint too high, encoder error | Check ±10 V reference, check encoder cable | Limit setpoint, repair encoder |
| 6 | Voltage drop | Undervoltage in the mains | Check voltage under load | Improve supply, check wiring paths |
| 7 | Overload | Continuous overload | Check axis mechanics, load profile | Reduce load, overhaul mechanics |
| 8 | Heat sink overheat | Heat sink too hot | Check cabinet ventilation, dust, airflow | Cleaning, improve ventilation |
Typical Applications
- Machine tools (Milling, turning – feed delivery 0.75 kW class)
- Packaging and handling machines
- Assembly and feeding systems
- Retrofit projects with existing SR servo technology
Service Notes
- Regularly clean the heat sink and ensure proper airflow
- Check the brake resistor for correct value and condition
- Perform motor insulation test only when the amplifier is disconnected
- Regularly check and tighten connectors
- Back up parameters – especially for OEM versions (BM)
Repair Description
- Initial inspection: Visual check, measurement of motor and mains cables, checking the condition of the feedback.
- Disassembly & Cleaning: Dismantling the device, cleaning the boards and the heat sink.
- Analysis: Checking the output stage, rectifier, capacitors, brake chopper, and control board.
- Repair: Replacement of defective transistor stages, rectifiers, capacitors; Reworking critical solder joints.
- Testing & Load Test: Test on the test bench motor, observation of temperatures, current behavior, and alarm triggering.
- Long-term Test & Conclusion: Controlled continuous operation under load; Documentation of all measured values and creation of a test report.