Last updated: 11/27/2018

Rotary - Troubleshooting Guide


Introduction

Symptom Table

Symptom Possible Cause Corrective Action

Alarm 106 A SERVO ERROR TOO LARGE

Alarm 111 A SERVO OVERLOAD

Alarm 164 A AXIS DRIVE FAULT

Alarm 187 B SERVO ERROR TOO LARGE

Alarm 188 B SERVO OVERLOAD

Alarm 193 B AXIS DRIVE FAULT

 

The feeds and speeds are too high for the work. Decrease the feeds and speeds.
The cutting tool is not sharp or is damaged. Install a new tool or a new tool insert.
There is a mechanical blockage in the axis of travel. Make sure the axis has a clear path of travel.
There is an internal mechanical obstruction in the rotary unit. Test the rotary unit.
The brake solenoid for the rotary unit has an electrical fault. Troubleshoot the brake solenoid.
The servo amplifier has a problem Troubleshoot the servo amplifier.
The machined part has inaccurate features There is lost motion or backlash in the rotary. Do the rotary backlash test.
The feeds and speeds are too high for the work. Decrease the feeds and speeds.
The tilt (A) axis of the trunnion does not find home.
The home sensor or cable is faulty.

Jog the tilt axis from the positive travel limit to the negative travel limit. Make sure the A HOME SWITCH bit changes (on the Diagnostics INPUT 2 screen). If the bit does not change, replace the home switch.

This can be done in the field This cannot be done on TR110 units.

Note: The A HOME SWITCH change cannot be seen on machines with software version 18.16A or higher.

Caution: If the A axis (tilt) moves more than 20 degrees past the home position,

Push [EMERGENCY STOP]

The tilt (A) axis does not home to a horizontal position.
The tool change offset parameter has not been set. Set the rotary platter flatness: Refer to the Rotary - TR/TRT/T5C - Platter Flatness - Adjustment procedure.
The tilt (A) axis does not home to a horizontal position consistently. The parameters 1115, 1116, 1122 are not set correctly.

On a machine with a rotary scale, when you install version M18.18A or higher to improve zero-return consistency: Be sure to set parameters 1115, 1116, 1122 correctly, as follows:

UMC-750:
Parameter 1116 (B Axis) = 5
Parameter 1122 (C Axis) = 5

TR-Series Rotaries with Scales:
Parameter 1115 (A Axis) =  4

Note: On machines that do not have rotary scales, set parameter 1115 to 0. TR-series rotary products that do not have a P2 or P4 on the name tag do not have rotary scales.

After you change parameter 1116, 1122, 1115:

  • When the rotary searches for zero, it may travel farther than it did before. This is normal.
  •  You must adjust the tool-change offset parameters (Parameter 212 for A Axis, Parameter 213 for B Axis, Parameter 523 for C Axis). Reference: Rotary - TR/TRT/T5C - Installation procedure

Alarm 423 AXIS SECONDARY ENCODER POSITION MISMATCH

 

Alarm 426 A AXIS SECONDARY ENCODER POSITION MISMATCH

Alarm 558 B AXIS SECONDARY ENCODER POSITION MISMATCH

Alarm 559 C AXIS SECONDARY ENCODER POSITION MISMATCH

Alarm 9944 AXIS SECONDARY ENCODER Z FAULT

Alarm 9945 AXIS SECONDARY ENCODER Z CHANNEL MISSING

Alarm 9946 AXIS SECONDARY ENCODER CABLE FAULT

 

The rotary scale or scale cable is faulty. Check the rotary scale cable.

Alarm 175 GROUND FAULT DETECTED

 

Alarm 185 A CABLE FAULT

Alarm 195 B CABLE FAULT

Alarm 552 TRIPPED CIRCUIT BREAKER

 

There is a short to ground in the axis motor cable. Test the axis motor cable for short.
There is a short to ground in the axis motor. Test the axis motor for short.

Program

Possible Cause: The feeds and speeds are too high for the work.

Corrective Action:

Decrease the feeds and speeds of the active program to decrease the machine load.

Tooling

Possible Cause: The cutting tool is not sharp or is damaged.

Corrective Action:

Examine the cutting tool for damage. Install a new tool or a new tool insert if the cutting tool is damaged or is not sharp.

Axis Obstruction

Possible Cause: There is a mechanical blockage in the axis of travel.

Corrective Action:

Make sure the axis has a clear path of travel. Tools, part fixtures, or work pieces that are too large can crash into the machine enclosure.

Mechanical Obstruction

Possible Cause: There is an internal mechanical obstruction in the rotary unit.

Corrective Action:

Disconnect the air supply to rotary unit. Press [ZERO RETURN], press the rotary axis letter, Press [SINGL], and jog the axis. If an alarm is generated, remove the necessary enclosure covers to get access to the faulty axis. Rotate the axis motor drive pulley by hand. If the axis cannot be rotated by hand, there is internal mechanical bind. The rotary unit needs to be serviced. For instructions on where to find a rotary repair facility and how to send your rotary unit, go to diy.haascnc.com

Brake Solenoid

Possible Cause: The brake solenoid for the rotary unit has an electrical fault.

Corrective Action:

Make sure the air supply is connected to the rotary unit. In MDI mode, push the rotary axis letter. Push [HAND JOG], you should hear air go out from the rotary unit. For solenoid test instructions, refer to Solenoid - Troubleshooting Guide.

Servo Amplifier

Possible Cause: The servo amplifier has a problem.

Corrective Action:

For servo amplifier troubleshooting instructions, refer to Servo Amplifier - Troubleshooting Guide.

Backlash

Possible Cause: There is lost motion or backlash in the rotary.

Corrective Action:

Test for backlash. For backlash test instructions, refer to HA5C Indexer - Backlash Test or Rotary Tables - Backlash Test.

Proximity Sensor

Possible Cause: The home proximity sensor is faulty.

Corrective Action:

For proximity sensor troubleshooting instructions, refer to Proximity Sensor - Troubleshooting Guide.

Rotary Scale

Possible Cause: The rotary scale or rotary scale cable is faulty.

Corrective Action:

Make sure the cables are connected correctly.

Inspect the rotary scale cables for wear or damage. 

Inspect the internal rotary scale cable interface cable, slightly pull on the wires to make sure they have a good crimp.  If the cables are connected correctly and not damaged, and the alarm persists, the rotary unit needs to be serviced.

For instructions on where to find a rotary repair facility and how to send your rotary unit, go to Haas Rotary Repair Center page.

Cable - Electrical Short

Possible Cause: There is a short to ground in the axis motor cable.

Corrective Action:

Inspect the rotary cables for wear or damage, refer to Sigma 1 - Axis Servo Motor and Cables - Troubleshooting Guide or Sigma 5 - Axis Servo Motor and Cables - Troubleshooting Guide.

Motor - Electrical Short

Possible Cause: There is a short to ground in the motor.

Corrective Action:

Test the rotary motor for a short to ground. For motor test instructions, refer to Sigma 1 - Axis Servo Motor and Cables - Troubleshooting Guide or Sigma 5 - Axis Servo Motor and Cables - Troubleshooting Guide.