Conveyor System - How it Works and Troubleshooting Guide

How it Works

  1. Conveyor
  2. Drive Motor
  3. Power Cord
  4. Conveyor Drive Shaft /Sprockets
  5. Belt
  6. Belt Tensioning Screws

The conveyor operates the same on both mills and lathes. The conveyor uses either keypad button commands or programmed M-codes. The CHIP FWD button on the keypad and M31 starts the chip removal system. The control sends a signal to the I/O PCB to turn the system on. Power is sent to the conveyor, which moves chips. The CHIP STOP button on the keypad and M33 stops the conveyor motion. The CHIP REV button on the keypad reverses the conveyor only while the button is pressed. In program mode, the conveyor will only reverse if a jam occurs. The conveyor shuts off if the jam is not cleared after three direction reversals. If the conveyor has an optional coolant washdown or air knife, the option will run while the chip conveyor is on.

  • Setting 114 - Conveyor Cycle-time (minutes) - Setting 114 Conveyor Cycle-time is the interval that the conveyor turns on automatically. For example, if Setting 114 is set to 30, the chip conveyor turns on every half an hour. On-Time should be set no greater than 80% of cycle-time.
  • Setting 115 - Conveyor On-time (minutes) - Setting 115 Conveyor On-time is the amount of time the conveyor runs. For example, if Setting 115 is set to 2, the chip conveyor runs for 2 minutes and turns off. On-time should be set no greater than 80% of cycle-time.

Symptom Possible Cause Corrective Action Section
The conveyor does not start. The circuit breaker is tripped. Check for a short in the motor or the cable. 1
No power from I/O PCB to the motor. Verify voltage at I/O PCB and the motor. 2
Blown fuses (I/O-version R and earlier). Check the fuses on the I/O PCB. 3
The conveyor motor capacitor is defective. Inspect motor capacitor for damage. 4
Conveyor is noisy or oscillates between forward and reverse. There is a build up of chips. Clear excessive chips and any obstructions. 5
The conveyor belt is damaged. Inspect conveyor belt and repair or replace. 6
The conveyor belt tension is incorrect. Adjust the belt tension. 7

Section 1

Symptom: The conveyor does not start.

Possible Cause: The circuit breaker is tripped..

Corrective Action:

Inspect the motor cable for any sign of damage. Check for burn marks at the plug. This could be caused by coolant contamination.

Measure the Ohms the across the motor power cable leads [1] at the plug. There should be resistance leg to leg. An open reading suggests a bad motor or cable.

Measure the Ohms on the motor power cable from each power leg to the ground leg [2] of the plug. This reading should be open.

If cable shows a short leg to ground at the plug, disconnect the power cable at the motor and check each motor power lead to the motor chassis [3]. If reading is open, the cable is at fault. If any lead tests short, the motor is motor is shorted.

Section 2

Symptom: The conveyor does not start.

Possible Cause:No power from I/O PCB to the motor.

Corrective Action:

Find the chip conveyor motor cable 140 at the I/O PCB. Press CHIP FWD. Use a multimeter with needle tip probes to measure the voltage between the black and red wires on the cable.

Have someone press and hold CHIP REV. Measure the voltage between the black and white wires. When the I/O PCB operates correctly, each voltage reading is 240 VAC.

If the voltage at the I/O PCB is correct, open the conveyor motor junction box. Use a multimeter with needle tip probes to check for voltage on the power leads at the motor.

If there is no voltage, check the motor and the cable. Refer to Section 1. If there is voltage, check the capacitor. Refer to Section 4. If you verify the voltage and capacitor are correct, inspect the motor drive shaft and keyway.

Section 3

Symptom: The conveyor does not start.

Possible Cause: Blown fuses (I/O-version R and earlier).

Corrective Action:

Check these fuses at the bottom right corner of the I/O PCB (Fuse type: AGC 5amp):

  • Single phase motors: FU2 [1] /FU3 [2]. There should be no fuse in FU4 [3].
  • 3 phase motors: FU2 [1] /FU3 [2] /FU4 [3]

A short in the motor or the cable could have blown the fuse . Refer to Section 1.

Section 4

Symptom: The conveyor does not start.

Possible Cause: The conveyor motor capacitor is defective.

Corrective Action:

Inspect the conveyor motor capacitor for damage. A damaged capacitor will usually have signs of deformation or bubbling on the capacitor casing. This could be caused by a short in the motor or in the cable. Refer to Section 1.

Open the motor junction box. Check the capacitor. Look for burn marks on the case.

Measure the capacitor. Most multimeters can measure capacitance upon manual activation (turn to the correct units of measurement, and push the yellow button). It should be 6 or 9 microfarad as noted on the capacitor's case.

Section 5

Symptom: Conveyor is noisy or oscillates between FWD and REV.

Possible Cause: There is a build up of chips.

Corrective Action:

Clear chips and obstructions. Make sure the conveyor settings are optimized for the chips that are produced.

Section 6

Symptom: Conveyor is noisy or oscillates between FWD and REV.

Possible Cause: The conveyor belt is damaged.

Corrective Action:

Inspect the conveyor belt for damage.

Section 7

Symptom: Conveyor is noisy or oscillates between FWD and REV.

Possible Cause:The conveyor belt tension is incorrect.

Corrective Action:

Make sure the belt tension is correct. Refer to the decals on the side of the machine or http://diy.haascnc.com for belt tensioning instructions.

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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