What causes Haas alarm 370?

Parts Catcher limit switch or proximity sensor is damaged, misaligned, or has a broken wire connection preventing proper position feedback to MOCON. Pneumatic solenoid valve for Parts Catcher is stuck, failed, or not receiving signal from IOCON output due to wiring fault or blown fuse. Air pressure to the Parts Catcher cylinder is insufficient due to shop air supply issues, clogged filter/regulator, or air line leaks. Parts Catcher cylinder is binding mechanically due to chips, debris, bent linkage, or worn cylinder seals causing slow or incomplete travel. IOCON board output for Parts Catcher solenoid has failed or MOCON is not receiving proper feedback signal due to connector or board-level fault.

How do I fix Haas alarm 370?

1. Step 1: Check shop air pressure at machine inlet (minimum 80-100 PSI required) and verify air is reaching Parts Catcher solenoid valve and cylinder 2. Step 2: Manually cycle Parts Catcher using MDI M-code commands (typically M88/M89) and listen for solenoid click and cylinder movement to isolate mechanical versus electrical fault 3. Step 3: Access Diagnostics screen and monitor Parts Catcher limit switch input status while manually moving Parts Catcher to verify switches are triggering properly 4. Step 4: Inspect Parts Catcher mechanism for physical obstructions, bent linkage, chips in cylinder rod area, and clean/lubricate all moving components as needed 5. Step 5: Check wiring from IOCON to solenoid valve and from limit switches back to MOCON connector, verify continuity and inspect for pinched or broken wires at cable carriers 6. Step 6: If all external components check good, test IOCON output with multimeter during Parts Catcher command, and verify MOCON input signal from limit switch; replace faulty board if no output or input detected

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Haas Controller

System · Intermediate · 20-60 minutes

Alarm 370

Haas Alarm 370 - Parts Catcher System Fault

Alarm 370 fires when the parts catcher system fails to respond to control commands within the programmed timeout period, typically due to pneumatic pressure loss, mechanical binding, or sensor feedback issues. The NGC control monitors catcher position feedback and air pressure status through dedicated I/O points.

HaasSystemIntermediate20-60 minutes

370

Haas Alarm 370 - Parts Catcher System Fault

Parts Catcher Fault

Root Cause Summary

Alarm 370 fires when the parts catcher system fails to respond to control commands within the programmed timeout period, typically due to pneumatic pressure loss, mechanical binding, or sensor feedback issues. The NGC control monitors catcher position feedback and air pressure status through dedicated I/O points.

Safety

Engage E-Stop and use HANDLE JOG mode when manually testing parts catcher movement - catcher arm moves with significant force and can cause pinch injuries
Verify machine is in E-Stop before reaching into parts catcher area - spindle may auto-start if door is closed and cycle is active
When testing pneumatic solenoids manually via Outputs page, keep hands clear of catcher arm path - sudden pneumatic actuation can cause injury

Causes and Fixes

1
Check Shop Air Pressure
Verify shop air pressure at the machine is between 80-120 PSI using the gauge on the air filter/regulator assembly.
Ensure machine is in emergency stop before checking pneumatic connections.
2
Inspect Air Filter and Water Separator
Check the air filter bowl for excessive water or contamination. Drain if necessary and replace filter element if dirty or clogged.
A dirty filter can cause pressure drop even with adequate supply pressure.
3
Test Pressure Switch Operation
Navigate to CURRENT COMMANDS > I/O and verify the air pressure input signal changes state when air pressure is applied/removed.
The pressure switch input should show active when adequate pressure is present.
4
Check Pneumatic Connections
Inspect all air lines to the parts catcher cylinder for leaks, loose fittings, or damaged tubing. Listen for air leaks while system is pressurized.

DIY Feasiblehigh confidence

Call a technician if:

·Sensor replacement required
·Pneumatic cylinder replacement needed
·Control system hardware failure suspected
·Parameter changes required beyond operator level

Prevention

Maintain proper shop air pressure and filtration
Regular cleaning of position sensors
Periodic lubrication of mechanical components
Keep work area clear of chip buildup

Common Mistakes

Ignoring gradual air pressure loss
Not checking sensor alignment after maintenance
Operating with contaminated air supply
Forcing manual operation without relieving air pressure

Related Alarms

369 371 372

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