1.Understand the Role of a Servo Cable

Before choosing a servo cable, it is important to understand what makes it different from a standard motor cable.

A traditional motor cable mainly transfers electrical power.

A servo cable usually handles multiple functions:

Power transmission

Providing energy from the servo drive to the motor.

Feedback communication

Transmitting encoder signals that provide real-time information about:

• Position
• Speed
• Rotation direction

Protection against interference

Maintaining signal stability in environments with:

• Frequency converters
• Servo drives
• Industrial controllers

Because servo systems require precise control, even small signal disturbances can affect machine accuracy.

2. Consider the Application Environment

The first question when selecting a servo cable is:

Where will the cable operate?

Different environments require different cable designs.

Fixed Installation Applications

If the servo motor and equipment remain stationary, the cable mainly needs:

• Electrical reliability
• Temperature resistance
• Mechanical protection

A standard flexible servo cable may be sufficient.

Typical applications:

• Industrial cabinets
• Fixed machinery
• Control panels

Dynamic Motion Applications

Many automation systems require continuous cable movement.

Examples:

• Robot arms
• CNC machining centers
• Pick-and-place systems
• Automated assembly equipment

In these applications, the cable experiences:

• Repeated bending
• Twisting
• Acceleration and deceleration

A standard cable may fail due to:

• Conductor fatigue
• Insulation cracking
• Shield damage

For dynamic applications, choose a high-flex servo cable designed for continuous movement.

3. Check Cable Flexibility and Bending Performance

Flexibility is one of the most important factors in industrial automation.

A servo cable used in a moving application should have:

Fine-stranded copper conductors

Smaller copper strands provide better flexibility and resistance to repeated bending.

Flexible insulation materials

Common materials include:

• PVC
• PUR

Among them, PUR jackets are widely used for demanding environments because they provide:

• Excellent abrasion resistance
• Oil resistance
• Better mechanical durability

Cable Bending Radius

Every cable has a minimum bending radius.

Installing a cable below this limit may cause:

• Internal conductor damage
• Reduced service life
• Unexpected failure

For robotic and drag chain applications, always check:

• Required bending radius
• Movement speed
• Expected bending cycles

4. Evaluate Shielding Performance

Industrial automation environments are full of electromagnetic noise.

Common sources include:

• Servo drives
• Motors
• Frequency converters
• Power cables

Electromagnetic interference (EMI) can affect encoder signals and cause:

• Position errors
• Communication failures
• Machine vibration

A high-quality servo cable typically includes shielding structures such as:

Overall shield

Protects the entire cable from external interference.

Individual pair shielding

Provides additional protection for sensitive signal wires.

Copper braid shielding

Improves grounding performance and mechanical protection.

For precision automation systems, better shielding usually means higher system reliability.

5. Match the Servo Cable Structure to Your Motor System

Not all servo cables have the same internal design.

Depending on the motor system, the cable may include:

Power cores

Supply energy to the servo motor.

Brake wires

Control motor braking functions.

Encoder wires

Transmit feedback signals.

Additional communication wires

Support advanced servo systems.

Before purchasing, confirm:

• Motor manufacturer requirements
• Number of cores
• Voltage rating
• Current capacity
• Connector specifications

A cable with the wrong structure may not perform correctly even if the size looks similar.

6. Select the Right Jacket Material

The outer jacket protects the cable from environmental conditions.

Different materials provide different advantages.

For harsh industrial applications, PUR servo cables are often preferred because they can withstand demanding working conditions.

7. Consider Temperature and Chemical Resistance

Industrial environments can expose cables to:

• High temperature
• Low temperature
• Oil
• Coolant
• Chemicals

Before selecting a servo cable, check:

• Operating temperature range
• Chemical exposure
• Installation environment

For example:

A CNC machine using cutting fluid requires a cable with strong oil and coolant resistance.

A robot operating in an automotive factory may require a cable designed for welding environments.

8. Servo Cable Selection Checklist

Before placing an order, ask these questions:

✅ Is the cable fixed or continuously moving?

✅ How many bending cycles are required?

✅ Does the system require encoder feedback?

✅ What level of shielding is needed?

✅ What temperature range will the cable experience?

✅ Is oil or chemical resistance required?

✅ What certifications are required?

These factors determine whether the cable can deliver long-term reliability.

Common Mistakes When Choosing Servo Cables

Mistake 1: Choosing Based Only on Price

A cheaper cable may reduce initial cost, but frequent failures can lead to:

• Production downtime
• Maintenance expenses
• Replacement costs

The total cost of ownership is often much higher.

Mistake 2: Using Standard Motor Cable Instead of Servo Cable

Although they may look similar, they serve different purposes.

Motor cables focus on power transmission.

Servo cables must handle both:

Power + Precision feedback signals

Mistake 3: Ignoring Mechanical Requirements

A cable that works perfectly in a fixed installation may fail quickly in a moving application.

Always consider the actual operating conditions.

How AEIN Helps Industrial Automation Companies Choose the Right Servo Cable

Looking for reliable industrial cable solutions?

AEIN Cable has over 14 years of experience in manufacturing:

• UL CMP Plenum Cable

• Servo Cable

• Drag Chain Cable

• Robot Cable

• Continuous Flex Cable

Visit http://www.aein-wirecable.com to explore our products and technical resources.