sigma 1 - axis servo motor and cables - troubleshooting guide...motor connector to chassis ground....

LAST UPDATED: 02/07/2020

Sigma 1 - Axis Servo Motor and Cables - Troubleshooting Guide - CHC

Electrical Safety

Caution: When you do maintenance or repair on CNC machines and their components, you must always followbasic safety precautions. This decreases the risk of injury and mechanical damage.

• Set the main circuit breaker to the [OFF] position.

Danger: Before beginning any work inside the control cabinet the High Voltage indicator light on the 320V PowerSupply / Vector Drive must have been off for at least 5 minutes.

Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not fullyunderstand. If you have any doubts about doing a procedure contact your Haas Factory Outlet (HFO) and schedule aservice visit.


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Symptom Table


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SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION

Faulty servo amplifier.

Check the corresponding amplifier assembly.Refer to Servo Amplifier - TroubleshootingGuide to troubleshoot the amplifier.

Faulty power cable. Inspect the cables and connectors. Refer to the PowerCable section below.

Alarm 161 - 164 AXIS DRIVEFAULT.Alarm 993 AMPLIFIER SHORTCIRCUIT

Faulty servo motor. Check the corresponding servo motor. Refer to ServoMotor section below.

Faulty encoder cable/connection or faultyencoder.

Inspect the cables and connectors. Refer to the MainProcessor/Encoder Cable section below. Check theencoder steps/revolution versus and ball screw pitchand verify the encoder counts are accurate per eachrotation.

The axis motor brake, is notdisengaging when servosare enabled.

See the Motor Brake section below:

The axis ballscrew isdamaged.

Check the corresponding axis ballscrew.Refer to Ballscrew - Troubleshooting Guide totroubleshoot the ballscrew.

Alarm 103 - 105, 270,709 AXIS SERVO ERROR TOOLARGE.

Classic Haas Control Only -The machine parametersare not correct.

Make sure you have the correct parameters for thetype of axis motor.

1. Determine if machine has Sigma-1 orSigma-5 motors.Note: The Sigma-5 axis motor have apush-lock connector for the encoderplug.

2. Run parameter checker and select eitherSigma-1 or Sigma-5 option.

Alarm 103 - 105 AXIS SERVOERROR TOO LARGE, duringthe zero return process. Theaxis zero returns in the wrongdirection.

The home sensor is beingmade during the zeroreturn process causing theaxis to zero return in theopposite direction.

Check the axis home switch to make sure there are nometal chips on top of the sensor.

Faulty encoder cable/connection or faultyencoder.

Inspect the cables and connectors. Refer to the MainProcessor/Encoder Cable section below. Check theencoder steps/revolution versus and ball screw pitchand verify the encoder counts are accurate per eachrotation..Alarm 135 - 137 AXIS MOTOR

OVERHEAT.

The Mocon/Maincon PCBaxis channel is defective.

Swap the Encoder/Drive channels with another axis, ifthe alarm stays with the encoder/drive channel thenthe Mocon/Maincon PCB is defective.


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http://www.haascnc.com/content/haascnc/en/service/troubleshooting-and-how-to/troubleshooting/Ballscrew_Troubleshooting_Guide.html


The low-volt-power-supplyis defective.

Check the +5V / +12V / -12V DC voltages going to theMocon/ Maincon PCB.

The parameter OVER TEMPNC bit 14 for the axis isincorrect.

Make sure this parameter bit is set correctly. This isnormally a 1.

Faulty encoder cable orconnection.

Inspect the cables and connectors. Refer to the MainProcessor/Encoder Cable section below.

Alarm 139 - 142 190,273 MOTOR Z FAULT.

Alarm 153 - 156 Z CHANNELMISSING

Alarm 182 - 185, 194,278 AXIS ENCODER CABLEFAULT.

Alarm 217, 218, 219 AXISPHASE ERROR

Alarm 224 - 228 AXISTRANSITION FAULT

Faulty encoder on servomotor.

Check the motor for coolant contamination. Check theencoder steps/revolution versus and ball screw pitchand verify the encoder counts are accurate per eachrotation.

Power CableCorrective Action:

Make sure the cables are connected correctly to the corresponding amplifier. Inspect the connector at the motor.Look for loose connections or contamination.

Look for signs of damage or stiffness on the cable. Disconnect the power cable from the amplifier and motor.Measure the resistance from leg to leg, and from leg to ground. Make sure the measurements result in an openconnection. Check each leg from one end of the cable to the corresponding leg on the other end of the cable forcontinuity. If there is an open connection, there is a problem with the cable.


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Servo Motor

Corrective Action:

Make sure the motor's connectors are notcontaminated. Disconnect and inspect the powercable connector at the motor. Make sure thatthere is no coolant contamination. Coolantcontamination can generate drive fault alarmsand damage the amplifier. Measure theresistance from the pins labeled A, B and C at themotor connector to chassis ground.

• The reading must show an open circuit.• If the reading does not show an open

circuit, the servo motor is at fault.


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Main Processor/Encoder Cable/Encoder

Corrective Action - Main Processor/Cable:

Examine the connector [1] on the Maincon orMOCON PCB. Make sure it is not damaged.

Examine the cable. Look for signs of damage orstiffness. The connector [4] has two housings[2,3] for the cable pins.

Measure the resistance on the encoder cablefrom leg to leg, and from leg to ground. Makesure each measurement results in an openconnection.

Make sure the cable is firmly connected at bothends. Reseat both connections. Make sure thecable is installed in the correct connector at theMaincon or MOCON PCB.

Corrective Action - Servo Motor Encoder:

Check the encoder steps/revolution in theconfiguration file. Jog the axis and based on thedistance the ball screw travels per revolution (ballscrew pitch), verify the encoder counts areaccurate per each rotation. View thediagnostic>axis page as you jog the axis. The rawencoder count will show you how many encodersteps have been counted. The z axis channel willalso show how many steps have been counted,but will reset each time the z-pulse is passed.The z-pulse is the encoder zero point, so it willreset every time the encoder does onerevolution. Based on this information, you willknow if the encoder works if the correct amountof steps per revolution are counted each timeyou jog the axis the distance of the ball screwpitch length. If the numbers do not match up,you have a problem.


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Motor Brake

Electrical Diagrams

Corrective Action:

Reseat the the connection for connectors P79 orP78 [1] on the I/O PCB.

Measure the voltage across the red and blackcables.

Press [EMERGENCY STOP]. There should be novoltage.

Press [RESET] to clear the alarms. The voltageshould be between 20-30 VDC.

Examine the connection at the motor's brake [2]and power connectors [3] for contamination.Reseat the connections.

If no voltage is present, refer to:

• I/O PCB -TROUBLESHOOTING GUIDE(CLASSIC HAAS CONTROL)


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sigma 1 - axis servo motor and cables - troubleshooting guide...motor connector to chassis ground....

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