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Check TSC Pressure Switch Status

Navigate to CURRENT COMMANDS > COOLANT and observe TSC pressure indication. Check parameter 378 (TSC Pressure Switch Input) status in SETTING > PARAMETERS.

Parameter 378 should read '1' when system pressure is adequate

Verify Physical Pressure Switch

Locate the pressure switch on the TSC pump assembly and check electrical connections. Use multimeter to verify switch continuity at operating pressure.

Ensure TSC pump is off before checking electrical connections

Adjust or Replace Pressure Switch

If switch is adjustable, set to manufacturer specification (typically 200-300 PSI). Replace switch if faulty, ensuring proper thread sealant application.

Use Teflon tape or thread sealant rated for coolant compatibility

Verify Pump Motor Operation

Command M88 and visually/audibly confirm TSC pump motor starts. Check parameter 377 (TSC Pump Run Signal) in SETTING > PARAMETERS for proper feedback.

Parameter 377 should change to '1' when M88 is active

Check Motor Contactor and Overload

Inspect TSC pump motor contactor for proper operation and auxiliary contact function. Verify motor overload relay is not tripped and auxiliary contacts are functioning.

Lock out electrical power before inspecting contactor connections

Test Feedback Circuit Continuity

Trace feedback signal from motor contactor auxiliary contact to NGC I/O board. Check wire continuity and proper termination at both ends.

Feedback signal typically connects to a digital input on the machine I/O board

Locate and Inspect Flow Switch

Find the TSC flow switch in the coolant line (usually near spindle entry point). Check parameter 379 (TSC Flow Switch Input) status in SETTING > PARAMETERS.

Not all Haas machines have flow switches - check machine specifications

Clean Flow Switch Assembly

Remove flow switch and clean internal paddle/sensor mechanism. Check for debris or coolant buildup that could prevent proper operation.

Drain TSC system pressure before removing flow switch

Test Flow Switch Electrical Function

With flow switch removed, manually actuate mechanism and verify electrical continuity change. Replace switch if electrical function is compromised.

Some flow switches have adjustment screws for sensitivity - consult machine manual

Check TSC Timeout Parameter

Navigate to SETTING > PARAMETERS and verify parameter 376 (TSC Confirmation Timeout) is set appropriately. Typical values range from 5-15 seconds depending on system.

Increase timeout incrementally if system needs more time to stabilize

Verify TSC Enable Parameters

Check parameter 375 (TSC Enable) is set to '1' and any machine-specific TSC configuration parameters are properly set per machine manual.

Some machines have additional parameters for TSC pump delay and pressure settings

Test System Response Time

Time the actual system response from M88 command to full pressure/flow confirmation. Adjust parameter 376 to allow adequate margin above measured time.

Add 2-3 seconds margin to measured response time for parameter setting

Check Coolant Tank Level and Quality

Verify coolant tank has adequate level for TSC pump operation. Check for excessive foam, contamination, or air entrainment that could cause pump cavitation.

Low coolant level can damage TSC pump - maintain proper level at all times

Inspect TSC Filters and Strainers

Check and clean TSC system inlet strainer and any inline filters. Replace filter elements if excessively dirty or clogged.

Clean filters regularly to prevent pump damage and maintain system performance

Test Pump Performance

Monitor actual system pressure with external gauge during M88 operation. Compare to specification and check pump manufacturer's performance curve if pressure is low.

Document pressure readings for trend analysis and predictive maintenance