Haas Alarm 115 - Coolant Pump Overload is typically caused by a mechanical or electrical issue with the coolant pump system, such as a jammed impeller or motor overload. The most likely fix involves inspecting and clearing any blockages in the pump or resetting the overload protector. If the issue persists, electrical or bearing problems may require deeper investigation.
HaasCoolantBasic15-45 minutes
115
Haas Alarm 115 - Coolant Pump Overload
Coolant Pump Fault
This alarm indicates the coolant pump has failed to start, has tripped its overload protection, or the IOCON board has detected a fault condition on the coolant pump relay or motor circuit. The IOCON monitors the coolant pump contactor feedback signal and triggers this alarm when commanded pump state does not match actual pump status. Machine operation may continue but coolant flow will be unavailable for cutting operations.
Root Cause Summary
Haas Alarm 115 - Coolant Pump Overload is typically caused by a mechanical or electrical issue with the coolant pump system, such as a jammed impeller or motor overload. The most likely fix involves inspecting and clearing any blockages in the pump or resetting the overload protector. If the issue persists, electrical or bearing problems may require deeper investigation.
Safety
Pump may be hot
Causes and Fixes
1
Power Down Machine
Turn off the machine and disconnect power to ensure safety while inspecting the coolant pump.
Always double-check that the machine is in a complete power-off state before proceeding.
Risk of electrical shock if power is not disconnected.
2
Access Coolant Pump
Remove the coolant tank cover or access panel to expose the pump assembly. Inspect the impeller area for visible debris or chips.
Use a flashlight to get a clear view of the impeller blades.
Coolant may be hot; wear protective gloves.
3
Clear Impeller Blockage
Carefully remove any debris or chips blocking the impeller using a small tool or compressed air. Rotate the impeller by hand to ensure it moves freely.
Avoid using excessive force; if the impeller is stuck, it may indicate a deeper issue.
Sharp debris can cause injury; handle with care.
1
Check Overload Protector
Locate the overload protector on the pump motor (refer to the Haas manual for exact location). Check if it has tripped and reset it if necessary.
If the protector trips again immediately after reset, there is likely an underlying electrical issue.
Ensure machine power is off before touching electrical components.
2
Inspect Motor Temperature
Feel the motor housing for excessive heat. If it is unusually hot, allow it to cool down before restarting.
Use an infrared thermometer for accurate temperature readings if available.
Hot surfaces can cause burns; use caution.
3
Test Motor Operation
After cooling and resetting, power on the machine and observe if the pump runs without tripping. Monitor for unusual noise or vibration.
Run the pump for a short duration initially to avoid further overload.
Do not operate if the motor shows signs of distress.
1
Check Coolant Condition
Inspect the coolant in the tank for unusual thickness, discoloration, or foul odor, which indicate contamination or degradation.
Use a refractometer to check coolant concentration if available.
Avoid skin contact with contaminated coolant.
2
Drain and Replace Coolant
If coolant appears compromised, drain the tank completely and replace it with the manufacturer-recommended coolant mix.
Flush the system with clean water before adding new coolant to remove residue.
Dispose of old coolant per environmental regulations.
3
Test Pump with New Coolant
After replacing the coolant, run the pump and monitor for proper operation and flow rate without overload alarms.
Check flow visually at the nozzle to ensure proper circulation.
Ensure no leaks during testing.
1
Listen for Bearing Noise
With the machine powered off, manually rotate the pump shaft (if accessible) and listen for grinding or rough sounds indicating bearing wear.
Use a stethoscope tool for better sound detection if available.
Ensure power is off before manual inspection.
2
Check for Shaft Play
Feel for excessive lateral or axial play in the pump shaft, which can indicate bearing failure.
Compare with a known good pump if unsure about acceptable play levels.
Avoid forcing movement if resistance is felt.
3
Plan Bearing Replacement
If bearings are confirmed damaged, order replacement parts per the Haas manual and schedule downtime for repair or replacement.
Consider replacing seals and gaskets at the same time to prevent future leaks.
Improper installation can cause further damage; follow manual precisely.
1
Inspect Wiring Connections
With power off, visually inspect all wiring to the coolant pump for loose, frayed, or damaged connections.
Tighten terminal screws if loose, but do not overtighten as it can strip threads.
Risk of shock if power is not disconnected.
2
Test Motor Continuity
Use a multimeter to check for continuity across motor windings. Refer to the Haas manual for expected resistance values.
Label wires before disconnecting to ensure correct reassembly.
Only trained personnel should perform electrical tests.
3
Check Voltage Supply
Verify that the voltage supply to the pump matches the specifications in the manual using a multimeter during operation.
Fluctuating voltage can indicate a broader electrical issue; consider a power quality check.
High voltage testing requires extreme caution.
DIY Feasiblemedium confidence
Call a technician if:
·If electrical issues are suspected and you lack electrical testing expertise.
·If bearing replacement or motor repair is required and you lack the tools or experience.
Prevention
Maintain proper coolant concentration and replace coolant regularly per manufacturer guidelines.
Install chip filters or strainers to prevent debris from entering the coolant system.
Schedule routine pump inspections to catch bearing wear or electrical issues early.
Common Mistakes
Ignoring coolant maintenance, leading to viscosity issues or contamination.
Attempting to force a jammed impeller without proper inspection, risking further damage.
