Symptoms: Alarm 622 TOOL CHANGER ARM FAULT. Alarm 2066 TOOL CHANGER HOME POSITION FAULT.
Possible Cause: The tool changer arm is not at the origin position when the machine is powered on, or it was not recovered correctly.
Check the arm at Arm at Origin bit in Recovery.
Recover the tool changer.
Symptoms: Alarm 622 TOOL CHANGER ARM FAULT. Alarm 2066 TOOL CHANGER HOME POSITION FAULT. Alarm 627 ATC ARM MOTION TIMEOUT. 628 ATC ARM POSITIONING ERROR.
Possible Cause: One or more of the proximity sensors on the cambox are defective.
Remove the carousel number plate to get access to the sensors . Go into the manual tool recovery and push ATC FWD to move the arm through a complete cycle. Make sure the LED on the sensor and the diagnostic bit state change at the correct stage of the tool change cycle. See the chart below.
If the sensors fail to change state, go to diy.haascnc.com to troubleshoot and replace the proximity sensors.
|SENSOR||Origin||Rotation||Tool Pick - Up||Down / Rotation 180 / Up||Tool Exchange||Arm Backup (Reverse)||Origin|
|Clamp/unclamp||Amber/0||Amber/0||Off / 1||Amber/0||Off / 1||Amber/0||Amber/0|
|Origin||Off / 1||Red / 0||Red / 0||Red / 0||Red / 0||Red / 0||Off / 1|
|Motor stop||Off / 1||Red / 0||Off / 1||Red / 0||Off / 1||Red / 0||Off / 1|
Symptoms: Tools fall out of the spindle side during a tool change. Alarm 627 ATC ARM MOTION TIMEOUT.
Possible Cause: The spindle orientation is incorrect.
Find the cause of the spindle orientation error.
Make sure spindle drive and encoder belts have the correct tension. Make sure the spindle motor pulley  and encoder pulley  are not worn.
Symptoms: Alarm 628 ATC ARM POSITIONING ERROR. Tools fall out of the spindle side during a tool change.
Possible Cause: The double arm's travel was obstructed. The double arm is bent.
Use a straightedge to find out if the arm is bent. If the arm is bent, these are some of the possible causes:
1: The tool release piston (TRP) sensor(s) are not adjusted correctly.
If the TRP sensors are not adjusted correctly, a tool can get stuck in the spindle taper, or the drawbar might not release a tool. Damage to the double arm can occur. Adjust the tool release piston switches correctly. Refer to VMC - 20/30/40-Taper- TRP - Proximity Sensor - Adjustment.
2: The arm crashed into a rotary or a fixture during a tool change.
Refer to your operator's manual to set the tool change offset, or alias an M06 command, to move the spindle to a safe height. Move the obstacle on the table to a safe distance away before the tool change. If you install a rotary or trunnion unit, mount it as far to the right as your setup will allow. This gives you more room for safe tool changes.
Go to Episode 21 - How to Command a Safe Tool Change Position to Avoid Fixtures and Rotaries for more information.
3: A failed cambox position sensor may cause the machine to think the arm is at the home position. The Z Axis comes down and bends the arm. Refer to Section 2 in this document.
Go to parts.haascnc.com to find the correct double arm for your machine. Follow the replacement instructions that ship with the assembly.
Symptoms: 628 ATC ARM POSITIONING ERROR.
Possible Cause: The cambox drive belt is worn or damaged.
Inspect the belt for damage and replace it if necessary. Refer to VMC Side-Mount Tool Changer - Cambox Motor Replacement for how to replace the cambox belt.
Symptoms: Tools fall out of the spindle side during a tool change. Tools fall out of the pocket during a tool change
Possible Cause: The toolholder or pull studs are incorrect. The tool is too heavy.
Refer to these documents for the correct pull stud and tool weight specifications:
- 30-Taper Spindle - Toolholder and Pull Stud Information
- 40-Taper Spindle - Toolholder and Pull Stud Information
- 50-Taper Spindle - Toolholder and Pull Stud Information
If you have a heavy tool, install the Pocket Dampening Service Kit (P/N 93-0254). This kit dampens the air to the pocket up/down cylinder to slow down the pocket.
Symptoms: Tools fall out of the spindle side during a tool change. Tools fall out of the arm during rotation.
Possible Cause: The arm and the plunger are worn. The double arm cannot correctly engage with the tool.
Inspect the plunger and adjuster assembly. Refer to Side-Mount Tool Changer - Double Arm - Plunger and Adjuster Assembly - Inspection
Refer to Video - Side Mount Tool Changer (SMTC) Double Arm Maintenance for more information on how to maintain the double arm.
Symptoms: Alarm 628 ATC ARM POSITIONING ERROR.
Possible Cause: The cambox is defective.
Remove the motor and cycle the cambox by hand. There should not be any binding in the arm. There should be less than 1/4" (6 mm) of lost motion in the rotation or lift of the arm.