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Phone: +86 16626708626Description
Key Technical Specifications
- Part Number: B7128Q-03325
- Manufacturer: LAFERT
- Product Type: Servo motor
- Series: B71Q
- Rated Speed: 2000 RPM
- Rated Voltage: 296 V
- Rated Current: 11.5 A
- Status: Discontinued by manufacturer
- Availability: Limited stock
- Condition: New Surplus
- Replacement Note: Match encoder, brake, shaft, and connector options before ordering
- Application: Industrial motion control
Product Introduction
LAFERT B7128Q-03325 is a servo motor used in industrial motion-control systems. It is commonly purchased as a replacement for legacy equipment that needs an exact mechanical and electrical match.
This unit is sold as new surplus and is listed as discontinued by the manufacturer. Verify the nameplate, encoder type, brake option, shaft style, and connector layout before installation, because those details determine whether the motor will run correctly in your drive system.
- B7128Q-03325
- B7128Q-03325
- B7128Q-03325
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Motor does not enable | Drive fault, no enable signal, or wiring issue | ❌ Low | Measure drive control voltage and check the enable input at the drive terminals | Verify the drive and control wiring first |
| Motor hums but does not turn | Brake stuck, phase issue, or mechanical jam | ✅ Medium | Check brake release, phase sequence, and load condition | Inspect the brake and coupling before replacing the motor |
| Overtemperature alarm | Overload, poor cooling, or high cabinet temperature | ✅ Medium | Measure case temperature and airflow in the enclosure | Reduce load and confirm cooling path |
| Encoder fault | Feedback mismatch or damaged cable | ✅ High | Read the drive alarm and inspect encoder cabling | Match the feedback device and pinout exactly |
| Excess vibration | Misalignment, bearing wear, or coupling damage | ✅ High | Check shaft alignment and rotate the motor by hand with power off | Inspect mounting and bearings before swap |
| Immediate trip on startup | Shorted winding, wiring error, or wrong replacement | ✅ High | Measure winding resistance and insulation to ground | Do not run until the electrical checks pass |
If you are stuck, contact technical support with photos, nameplate data, and drive fault logs.
Frequently Asked Questions
Can I use B7128Q-03325 as a direct replacement?
Only if the voltage, current, speed, feedback type, shaft, brake, and connector options match the original motor. On LAFERT servo units, the suffix matters.
Is this part new, refurbished, or used?
This listing is best described as new surplus. It is unused inventory from legacy stock, not factory fresh production.
Why do some sellers call it tested instead of new?
Because surplus channels often mix unused stock and professionally tested repairs. Always check the seller’s condition note before ordering.
Can I swap it without reprogramming the drive?
Sometimes, but not always. If the encoder or brake option changes, the drive may need parameter changes before the motor will run correctly.
What should I check before installing it?
Match the exact part number, confirm the feedback device, verify the flange and shaft dimensions, and compare the nameplate ratings. A photo of the old motor saves time and prevents the wrong order.
Is this motor suitable for a rebuild?
Yes, if the mechanical interface and drive parameters match the original setup. Measure everything first; servo motors are unforgiving when the shaft or encoder is off.
What usually causes a replacement to fail on startup?
Wrong feedback wiring, brake mismatch, or a drive parameter mismatch. That is why the original nameplate and connector pinout should be copied before removal.
