What causes Haas alarm 195?

B-axis motor cable connector pins bent, corroded, or not fully seated at motor or servo amplifier connection points. B-axis motor cable damaged internally from excessive flexing in cable track, pinching, or cutting fluid degradation of cable jacket and conductors. Poor crimp connections or broken solder joints inside B-axis motor cable connectors from vibration or thermal cycling. B-axis cable shield continuity interrupted causing electrical noise pickup that corrupts encoder signals below acceptable threshold. Wrong cable type installed during previous service or incorrect cable routing causing excessive strain or minimum bend radius violation.

How do I fix Haas alarm 195?

1. Step 1: Power down machine and inspect both ends of B-axis motor cable for bent pins, debris in connectors, or incomplete connector engagement and reseat connections firmly 2. Step 2: Access Diagnostics > Encoders page and power up while monitoring B-axis encoder counts; if counts are erratic, missing, or show no change during hand rotation cable fault is confirmed 3. Step 3: Visually trace entire B-axis cable path from motor to servo amplifier checking for pinch points, excessive bending, cuts in cable jacket, or fluid contamination damage 4. Step 4: Disconnect B-axis motor cable at both ends and use multimeter to check continuity of all conductors end-to-end and verify no shorts between adjacent pins or to cable shield 5. Step 5: Measure resistance of cable shield from connector shell to connector shell which should be less than 1 ohm; high resistance indicates broken shield affecting noise immunity 6. Step 6: Replace B-axis motor cable with correct Haas part number for your machine model if any continuity faults or damage found; ensure proper cable routing and strain relief per service manual

Haas codes

axismd.ai

Haas Controller

Servo/Axis · Basic · 10-30 minutes

Alarm 195

Haas 195 - B CABLE FAULT | Haas CNC Alarm

Alarm 195 occurs when critical machine parameters requiring initialization during boot sequence have been modified. The NGC control prevents operation until a complete power cycle loads the new parameter values into active memory.

HaasServo/AxisBasic10-30 minutes

195

Haas 195 - B CABLE FAULT | Haas CNC Alarm

B CABLE FAULT

The MOCON board has detected a communication or electrical fault on the B-axis motor cable circuit, typically indicating an open connection, short circuit, or signal integrity problem between the servo amplifier and motor encoder or power connections. The control continuously monitors cable continuity and proper electrical characteristics through the feedback loop, and this alarm protects against operation with compromised cabling that could cause runaway motion or position loss.

Root Cause Summary

Safety

Always perform a controlled shutdown using the control's POWER OFF button before disconnecting main power to avoid corrupting the operating system or parameter memory.
After rebooting from encoder or feedback parameter changes (Parameters 100-119), jog axes at reduced feedrate (10-25%) initially to verify servo stability before running production programs, as incorrect encoder settings can cause sudden runaway or following errors.

Causes and Fixes

1
Verify Parameter Changes
Press SETTING, then PARAMETERS. Check if any parameters in ranges 70-99 or 200-299 show asterisk (*) indicating recent modification.
Use SETTING > ALARMS > HISTORY to see exactly which parameters were changed and when.
2
Document Current Settings
Write down or photograph the modified parameter values before power cycle in case rollback is needed.
Incorrect servo parameters can cause axis runaway or damage.
3
Perform Complete Power Cycle
Turn main power switch OFF, wait 10 seconds for capacitors to discharge, then turn ON. Allow full boot sequence to complete.
Watch for any new alarms during boot that might indicate parameter conflicts.

DIY Feasiblehigh confidence

Call a technician if:

·Parameters were changed accidentally and original values unknown
·Power cycle doesn't clear alarm
·New alarms appear after power cycle
·Machine behavior abnormal after parameter changes

Prevention

Document parameter values before making changes
Make parameter changes during scheduled downtime
Understand which parameters require power cycle before modification
Use parameter backup/restore function before major changes

Common Mistakes

Attempting to clear alarm without power cycle
Changing multiple critical parameters simultaneously
Not documenting original parameter values
Power cycling too quickly without allowing capacitor discharge

Related Alarms

1067 1068 9000

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Always verify with your machine manual or a certified technician before performing service procedures.