Service Home Conveyor System - Troubleshooting Guide - TG0053

Conveyor System - Troubleshooting Guide - TG0053

8A.3 Chip Conveyor System - Troubleshooting

Last updated: 05/14/2026

Standard Belt - Conveyor System - Troubleshooting Guide

TG0053

Revision C - 05/2026

Note: Download and fill out the Chip Conveyor System Inspection Report Checklist below before replacing any parts.

Chip Conveyor System Inspection Report Checklist

Introduction

This troubleshooting guide explains how to diagnose and resolve issues with a Standard Belt Conveyor System.

For other conveyor types, refer to Section 8b for the Filter Conveyor Troubleshooting Guide and Section 8c for the CDF Conveyor Troubleshooting Guide.

 
The images shows the following components of the standard belt conveyor system.
  1. Conveyor
  2. Drive Motor
  3. Power Cord
  4. Conveyor Drive Shaft /Sprockets
  5. Belt
  6. Belt Tensioning Screws

Exploded View

  1. CONVEYOR TROUGH COVER
  2. GASKET
  3. CONVEYOR TROUGH
  4. DOUBLE CHAIN LINK OUTER
  5. SINGLE CHAIN LINK OUTER
  6. CHAIN SPACER
  7. BELT PIN
  8. CHAIN LINK INNER
  9. BELT PLATE
  10. CONVEYOR TUNNEL INSERT
  11. CONVEYOR BRACKET
  12. HHB 5/16-18 X 1
  13. CONVEYOR RAMP COVER TOP
  14. CONVEYOR RAMP COVER SIDE
  15. CONVEYOR RAMP
  16. CONVEYOR CHUTE
  17. CONVEYOR TROUGH EXTENSION
  18. BHCS 5/16-18 X 1 SS

Symptom Table

NOTE: TO RECEIVE THE CORRECT TECHNICAL SUPPORT ON YOUR CONVEYOR, IT IS REQUIRED TO TAKE A CLEARLY VISABLE PHOTO OF THE CONVEYOR NAME PLATE AND THE MOTOR SEPCIFICATION PLATE.

Symptom Possible Cause Corrective Action
The conveyor does not start. The circuit breaker is tripped. Check for a short circuit in the motor or the cable. Refer to the Motor Cable Inspection section.
No power from I/O PCB to the motor. Verify voltage at I/O PCB and the motor.
Blown fuses (I/O-version R and earlier). Check the fuses on the I/O PCB.
The conveyor motor capacitor is defective. Inspect motor capacitor for damage.
Conveyor is noisy or oscillates between forward and reverse. There is a build up of chips. Clear excessive chips and any obstructions.
The conveyor belt is damaged. Inspect conveyor belt and repair or replace.
The conveyor belt tension is incorrect. Adjust the belt tension. See Belt Inspection section below.
The auger is noisy or oscillates between forward and reverse. Then Alarm 9906  CHIP CONVEYOR MALFUNCTION is generated. There is an excessive chip build-up or an obstruction. Clear all chips and obstructions from the auger trough and chip chute.

There is no chip build-up or obstruction and machine generates

Alarm 9906 CHIP CONVEYOR MALFUNCTION 

 The auger motor is bound up.

The machine is detecting an overcurrent condition.  Check the discrete input CHIP_CONVEYOR_OVERCURRENT cycles from 0 - 1  or 1 - 0 (0 means overload condition). Check the motor for burnout or binding.  

Run the Chip Conveyor Overcurrent Data Collection, refer to the Diagnostic Data Collection procedure for how to run the data collection.
The chip conveyor reverses direction with minimal or no chip build-up.

Chip Auger, Conveyor, may start without operator action, even with doors open.

 Machine has software 100.17.000.1016 Update software to 100.17.000.2030 or greater. This problem has been corrected such that the conveyor never restarts automatically. With a Classic Haas Control, the operator can restart the conveyor with the door open. NGC machines that have been updated after October 10th, 2018 will have strict door rules that makes this impossible. 

M31 is restarting conveyor timers if the conveyor is already on.

 Machine has software prior to 100.17.000.2030 and the conveyor cycle keeps restarting every time a M31 is encountered.

Update software to 100.17.000.2030 or greater. In the new software if a conveyor cycle is already running but in the off state, a M31 will NOT restart the conveyor. The conveyor will follow the cycle it is currently in.
Alarm 9819 CHIP CONVEYOR SHORT CIRCUIT The auger motor start capacitor is at fault. Inspect the auger motor start capacitor for damage.
Alarm 9848 CHIP CONVEYOR MOTOR DISCONNECTED There is no power from the I/O PCB to the motor. Verify the voltage at the I/O PCB and at the motor.
Over-drainage or coolant leaks Open/unsealed drainage holes allowing excessive coolant loss. Add plugs to prevent coolant leaks, refer to the Over-Drainage section for more details.

Motor Cable Inspection

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 shorted.

Voltage

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. If there is voltage, check the capacitor. If you verify the voltage and capacitor are correct, inspect the motor drive shaft and keyway.

Fuses

Corrective Action:

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

  • 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

Capacitor

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.

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.

Chips

Corrective Action:

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

Over-Drainage

Corrective Action:

If the conveyor is experiencing an over-drainage condition, install plugs to seal the drainage holes:

  • Obtain two (2) plugs, Part Number 59-6602.
  • Apply an appropriate sealant to each plug prior to installation. Refer to Lube Identification Chart for proper sealant. 
  • Install the plugs into the drainage holes and ensure they are fully seated and sealed.

 

Belt Inspection

The following service video shows how to resolve common issues with the Haas conveyor system.  

Note: This service video is for reference only and does not replace the written procedure.

Corrective Action:

Inspect the conveyor belt for damage.

Corrective Action:

Make sure the belt tension is correct. Refer to the decals on the side of the machine. The correct belt slack for Jorgensen conveyors is 0.25" - 0.38" (6 - 10 mm). The correct belt slack for Hennig conveyors is 0.12" - 0.25" (3 - 6 mm). 

Electrical Diagram