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Check Current Position

Press [CURRENT COMMANDS] to view current Y-axis position in machine coordinates and compare to Parameter 43 value.

Machine coordinates show true position relative to home switches, not work coordinates

Verify Parameter 43 Setting

Navigate to [SETTING] > [PARAMETERS] and check Parameter 43 (+Y Software Limit). Verify this matches your machine's actual travel capability.

Incorrect Parameter 43 values can cause premature limit alarms or allow overtravel damage

Clear Alarm and Jog Away

Press [RESET] to clear alarm, then use [JOG] mode with [HANDLE JOG] or slow [JOG] keys to move Y-axis in negative direction.

Use 0.0001" increments initially to ensure safe movement away from limit

Adjust Program or Setup

Review G-code program and work coordinate system (G54-G59) to ensure Y+ moves stay within Parameter 43 limits.

Always account for tool length and work offsets when calculating maximum travel

Check Limit Switch Status

Navigate to [SETTING] > [DIAGNOSTICS] > [INPUTS] and observe +Y LIMIT input status. Should show OFF when not triggered.

Never bypass or disable overtravel limit switches - they prevent catastrophic damage

Inspect Physical Switch

Visually inspect the +Y overtravel limit switch for proper mounting, actuation arm position, and mechanical damage.

Look for bent actuator arms, loose mounting screws, or debris interfering with switch operation

Manual Recovery

Use [HANDLE JOG] in [JOG] mode to carefully move Y-axis in negative direction away from limit switch until input shows OFF.

Move very slowly and watch diagnostics screen to confirm switch releases

Test Switch Operation

Manually actuate the limit switch while watching [DIAGNOSTICS] > [INPUTS] to verify proper electrical function before resuming operation.

Switch should show ON when pressed and OFF when released with no intermittent behavior

Review Active Work Offset

Check [CURRENT COMMANDS] screen to identify active work coordinate system (G54, G55, etc.) and verify offset values in [WORK OFFSETS] screen.

Press [WORK OFFSETS] key to quickly access and review all coordinate system values

Calculate Machine Coordinates

Add work offset Y-value to programmed Y-coordinate to determine actual machine coordinate position and compare to Parameter 43.

Always verify that Work Offset + Program Coordinate < Parameter 43 value

Adjust Work Coordinate System

Modify the active work offset Y-value to position the program within available machine travel, or select different work coordinate system.

Use [PART ZERO SET] function to establish new work coordinates based on current spindle position

Verify Program Envelope

Run [GRAPHICS] simulation to visualize complete program toolpath and confirm all moves stay within machine limits.

Check both rapid positioning moves and cutting moves for limit violations

Inspect Y-Axis Ways and Ballscrew

Visually examine Y-axis linear ways, ballscrew, and table for crash damage, debris, or obvious mechanical problems.

Turn off machine power before inspecting moving components

Check Servo Motor and Coupling

Inspect Y-axis servo motor mounting and ballscrew coupling for damage, looseness, or misalignment that could cause binding.

Listen for unusual noises during manual jogging that indicate mechanical problems

Test Manual Movement

With machine powered off, attempt to manually move Y-axis table to check for smooth operation and identify binding points.

Use proper lifting techniques and get assistance - machine tables are heavy

Clear Obstruction or Call Service

Remove any debris or fixturing causing interference. If mechanical damage is found, contact Haas service for repair assessment.

Document crash circumstances and damage extent for service technician reference

Monitor Switch Input Signal

Navigate to [SETTING] > [DIAGNOSTICS] > [INPUTS] and observe +Y LIMIT input while manually actuating switch to test electrical continuity.

Input should change state immediately when switch is pressed with no delay or flickering

Inspect Wiring Connections

Check limit switch wiring connections at both the switch and control cabinet for looseness, corrosion, or damage.

Turn off main power before inspecting electrical connections

Test Switch Continuity

Using multimeter, test limit switch continuity across normally-closed contacts while manually actuating switch mechanism.

Haas limit switches are typically normally-closed (NC) and should show continuity when not actuated

Replace Defective Components

Replace faulty limit switch or repair damaged wiring. Use only Haas-approved replacement parts with correct part numbers.

Improper limit switch replacement can compromise machine safety systems