Enclosure Exhaust - How it Works and Troubleshooting Guide

How It Works

The Haas Enclosure Exhaust system is a filtered vent system that interfaces with the Haas control. It removes coolant mist and smoke generated by the cutting process from the machine enclosure and away from the operator.

The Enclosure Exhaust uses a powerful, low-vibration, 600 CFM fan enclosed and mounted on the top of the machine enclosure. The fan creates a vacuum that removes the unwanted coolant mist and smoke from the inside of the machine enclosure. The coolant mist passes through two reusable woven-metal filter panels. The panels remove the coolant from the air. The removed coolant returns to the machine. The clean exhaust air and smoke is expelled out of the top of the unit. The system automatically turns on when the spindle starts, and turns off after the spindle stops. On machines made after June 2015 an on-screen icon alerts the operator when the filters need cleaning.

  1. Low-vibration fan
  2. Vacuum switch
  3. Reusable woven-metal filter panels
  4. Dirty filter icon
  5. Enclosure assembly

Symptom Possible Cause Corrective Action Section
The dirty filter icon appears. The filter boxes are dirty and clogged. Clean the filter boxes. 1
The vacuum switch is defective. Test the vacuum switch. 2
The Enclosure Exhaust does not remove coolant mist and smoke. There is a problem with the fan, or with the power to the fan. Inspect the fan for damage and check the power to the fan. 3
The vacuum switch is defective. Test the vacuum switch. 2

Section 1

Symptom: The dirty filter icon is shown.

Possible Cause: The filter boxes are dirty and clogged.

Corrective Action:

Slide the filters out of the Enclosure Exhaust. Clean the filters with soap and water. Put them back in the enclosure exhaust assembly.

Section 2

Symptom: The Enclosure Exhaust does not remove coolant mist and smoke. The dirty filter icon is shown.

Possible Cause: The vacuum switch is defective.

A faulty vacuum switch may fail to notify you of a dirty filter, or may falsely indicate that the filters are dirty.

Corrective Action:

Disconnect the vacuum switch from the I/O PCB. Put a jumper on the vacuum switch connector pins on the I/O PCB. The connector is at P23 for CHC [1] and P34 for NGC [2].

Go to Enclosure Exhaust Clogged on the I/O tab of the Diagnostics screen. Verify the value changes state when you put the jumper on the pins. If the value changes state, replace the vacuum switch.

If the value does not change, check the cable for damage. If the cable is not damaged, go to I/O PCB - How it Works and Troubleshooting Guide (Classic Haas Control).

Section 3

Symptom: The Enclosure Exhaust does not remove coolant mist and smoke.

Possible Cause: There is a problem with the fan, or with the power to the fan.

Corrective Action:

Clean the fan. Inspect the fan blades for damage. Make sure the fan turns by hand. If there is damage to the fan blades, or the fan does not turn by hand, replace the fan.

If the fan turns:

  1. Measure the spindle fan connector on the I/O PCB. The correct voltage is 120 VAC.

    Measure the voltage at P41 for machines with the Classic Haas Control (CHC) and at P32 on machines with the Next Generation Control (NGC).

    If there is no voltage at the spindle fan connector, go to I/O PCB - How it Works and Troubleshooting Guide (Classic Haas Control).

  2. If there is 120 VAC at the spindle fan connection, measure the voltage at the end of the spindle fan cable 300A.

    If there is no voltage at the end of the cable, replace cable 300A. If voltage is present, the fan is faulty.

Be aware: Many service and repair procedures should be done only by authorized personnel. The service technicians at your Haas Factory Outlet (HFO) have the training, experience, and are certified to do these tasks safely and correctly. You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes.

Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not completely understand. Contact your Haas Factory Outlet (HFO) and schedule a service technician visit if you have any doubts about doing a procedure.

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