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Visually inspect the spindle coolant tank and verify the coolant level is below the minimum mark or level switch position.

Check for visible coolant leaks around the tank, pump, hoses, heat exchanger, and spindle motor connections.

Refill the coolant tank with the manufacturer-specified coolant mixture to the proper level (typically between MIN and MAX marks).

Use only the coolant type specified in the spindle motor manual. Incorrect coolant can damage seals and reduce cooling efficiency.

Reset the alarm and verify proper operation. Monitor coolant level over the next few hours to confirm no ongoing leak exists.

Verify coolant is at proper level visually, then locate the level switch in the coolant tank (typically a float switch or capacitive sensor).

Manually actuate the float switch or clean the sensor probe. Check for debris, sludge buildup, or mechanical binding preventing proper operation.

Disconnect power before removing or manipulating the level switch.

Using a multimeter, check continuity across the level switch terminals while manually actuating it to verify electrical function. Compare readings to normal state in the electrical schematic.

Check wiring from the level switch to the spindle drive unit for damage, loose connections, or corrosion at X-axis connector terminals. Replace switch if defective.

Access spindle parameters and verify the coolant level switch input configuration matches the actual hardware installed (normally open vs. normally closed).

Check spindle diagnosis screens to view the real-time status of the coolant level input signal. Verify it changes state when the switch is manually actuated.

Inspect the spindle drive PCB input circuit for the level switch signal. Check for burnt components, damaged traces, or corrosion around the input terminal block.

Only qualified personnel should inspect internal drive components with proper ESD precautions and lockout/tagout procedures.

If signal monitoring shows no change when switch actuates, temporarily jumper the level switch input at the drive to simulate proper level and determine if alarm clears, indicating wiring or switch failure vs. drive input failure.

This is for diagnostic purposes only. Do not operate the spindle with the level switch bypassed.