Mitsubishi Elevator Main Drive Rotary Grating Encoder X65AC

The X65AC series rotary grating encoder is commonly used on Mitsubishi elevator traction machines and main drive systems.

Installed on the motor shaft, the encoder continuously provides speed and position feedback to the inverter and controller, helping maintain accurate leveling, smooth acceleration, stable operation, and reliable motor control.

The X65AC encoder family is widely found in Mitsubishi traction machines used in commercial buildings, residential towers, hotels, hospitals, and modernization projects.

Commonly Requested Models

We can supply a wide range of Mitsubishi traction machine encoder models, including:

• X65AC-01
• X65AC-10
• X65AC-19
• X65AC-20
• Z65AC-08
• Z65AC-011
• Z65AC-012
• Z65AC-015
• Z65AC-016
• Z65AC-018
• Z65AC-24
• Z65AC-30
• Z65AC-31
• TS5208N101

Other Mitsubishi encoder models may also be available upon request.

To ensure compatibility, customers are encouraged to provide:

• encoder nameplate photos
• traction machine information
• original part numbers
• motor model details

A Persistent Leveling Issue That Was Not Caused by the Drive

A service company responsible for several office building elevators received repeated complaints about inconsistent floor leveling.

Passengers occasionally noticed the elevator stopping slightly above or below the landing level.

The maintenance team initially inspected:

• inverter parameters
• brake operation
• leveling sensors
• controller settings

All systems appeared normal.

Further analysis revealed intermittent feedback signal loss from the traction machine encoder.

Because the signal interruption occurred only occasionally, the fault was difficult to identify during routine inspections.

After replacing the encoder, the leveling issue disappeared and the elevators returned to stable operation.

Why Encoder Problems Often Lead to Misdiagnosis

Encoder-related faults rarely produce obvious symptoms.

Instead, technicians may encounter:

• leveling inaccuracies
• intermittent drive alarms
• abnormal speed feedback
• inconsistent acceleration
• occasional shutdown events
• unexplained operation instability

Since these symptoms may also be caused by the inverter, drive board, brake system, or control circuits, the encoder is often checked later in the troubleshooting process.

Components Usually Checked Together

When servicing X65AC encoders, maintenance teams commonly inspect:

• Mitsubishi traction machines
• motor feedback cables
• encoder connectors
• inverter drive systems
• speed control circuits
• leveling control systems

In some installations, cable damage or connector oxidation may generate symptoms similar to encoder failure.

For this reason, technicians often verify the complete feedback circuit before replacing major drive components.

Frequently Found During Modernization Projects

Older Mitsubishi elevators undergoing modernization often retain the original traction machine while replacing controllers and drive systems.

In these situations, maintenance teams frequently evaluate the condition of:

• traction machine encoders
• motor feedback circuits
• encoder mounting assemblies
• signal transmission reliability

Replacing a worn encoder can improve long-term system stability and reduce troubleshooting time after modernization work.

Before Ordering

Before purchasing a replacement encoder, please verify:

• complete encoder model number
• traction machine model
• connector configuration
• cable length
• mounting dimensions
• original Mitsubishi part identification

Many Mitsubishi encoders have similar external appearances but different signal specifications and installation requirements.

Providing a clear nameplate photo is often the fastest way to confirm compatibility.

Maintenance Notes

Experienced elevator maintenance companies often keep commonly used X65AC and Z65AC encoder models in stock because encoder failures can create symptoms that resemble much more expensive inverter or controller faults.

Early diagnosis can help reduce downtime and avoid unnecessary replacement of other components.

FAQ

Can a faulty encoder affect elevator leveling?

Yes. Inaccurate speed or position feedback may cause the elevator to stop slightly above or below floor level.

Can encoder faults trigger inverter alarms?

Yes. Since the inverter relies on encoder feedback for motor control, unstable signals may generate drive-related fault messages.