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A servo amp—also known as a servo amplifier—is a key component in CNC machines, robotics, and industrial automation. It controls the servo motor’s speed, torque, and position, allowing precise machine movement.
While many brands manufacture servo amplifiers, this guide focuses on the two most widely used and supported in the global CNC industry: FANUC and Mitsubishi. These are also the primary brands our company specializes in for sales, testing, and repair services.
If you want to better understand how servo amplifiers work and how to choose or troubleshoot FANUC and Mitsubishi servo amps, this article will guide you through everything.
A servo amplifier receives commands from a CNC controller (e.g., FANUC 0i/30i series or Mitsubishi M80/M700 series) and converts those signals into controlled electrical power for the servo motor.
| Servo Amp | Spindle Drive |
|---|---|
| Controls servo motors | Controls spindle motors |
| Precision movement (X, Y, Z axes) | High-speed rotation for cutting tools |
| Works with encoder feedback | Works with speed commands |
FANUC is one of the most reliable and widely used CNC brands in the world. Their servo amplifiers are known for stability, long lifetime, and excellent performance in CNC machining centers, lathes, and automation systems.
Our technicians can:
Mitsubishi servo amplifiers are widely used in CNC milling, grinding machines, EDM machines, and automation production lines. They are valued for fast response, good compatibility, and long operational life.
Our company provides:
| Feature | FANUC Servo Amplifier | Mitsubishi Servo Amplifier |
|---|---|---|
| CNC Compatibility | FANUC CNC systems | Mitsubishi CNC systems |
| Application | Machining centers, lathes, robotics | Milling, EDM, automation |
| Reliability | Very high, stable for long-term use | High, fast response |
| Cost | Generally higher | More cost-effective |
Both brands are excellent, but your choice depends on your machine’s CNC system.
When selecting a replacement or spare servo amp, consider the following:
These numbers ensure compatibility.
Different motors require different servo amps:
Repair may be cheaper, but replacement is faster if production is urgent.
Incorrect installation can damage the CNC system.
Our team can help evaluate your unit and recommend the best solution.
Before deciding your servo amp is faulty, you can check:
Stop using the machine immediately and contact a technician.
We specialize in the industrial CNC field, especially FANUC and Mitsubishi systems.
Our Advantages
If your servo amplifier is faulty or you need replacement parts, our team can help with fast, reliable service.
A servo amplifier is essential to the precise movement of CNC machines. Whether you are using FANUC or Mitsubishi, choosing the right servo amp and keeping it properly maintained ensures stable machine performance and reduces downtime.
If you need testing, repair, or replacement servo amplifiers, feel free to contact CNCFixtech—we are ready to support your maintenance needs with professional service and reliable products.
A servo amp is a device that controls the servo motor’s speed, torque, and position based on commands from the CNC controller. It ensures precise axis movement and stable machine performance.
A servo amp controls axis servo motors, while a spindle drive controls the spindle motor for high-speed rotation. They serve different functions in CNC machines and are not interchangeable.
Many FANUC and Mitsubishi servo amplifiers can be repaired, especially issues involving IGBT modules, capacitors, control boards, or power supply sections. However, if the damage is severe or urgent production is required, replacing the unit is recommended.
Typical causes include:
Regular cleaning and inspection can help prevent failures.
Yes. A faulty servo amplifier can send improper voltage or current to the motor, potentially causing overheating or internal winding damage. If any alarm appears, stop using the machine and test the amplifier immediately.
How we process your repair requirements
Get in touch with us and provide as much detail as possible about the issue you are experiencing.
Our professional repair team will help assess the severity of the problem and the possibility of repair.
The customer sends or delivers the servo drive to our company. We register it in our system and prepare it for further inspection.
Our engineers diagnose the fault points of the servo drive and provide a detailed inspection report, including the final repair cost and estimated repair time.
We provide the repair quote to the customer and wait for their confirmation. If the customer agrees to the quote, we proceed with the repair.
Upon customer approval, we carry out the necessary repairs. After repairs are completed, we perform tests with the motor and conduct aging tests to ensure the servo drive operates reliably under various conditions. Once the testing is successful, we register the drive for delivery.
The customer completes the payment, and we deliver the repaired servo drive to the customer.
We provide attentive follow-up service to ensure customer satisfaction and address any further needs.
