1021

Check TSC Tank Level

Navigate to CURRENT COMMANDS and verify TSC tank has adequate coolant level above minimum mark.

Ensure spindle is stopped and machine is in EMERGENCY STOP before checking tank

Inspect TSC Filter

Remove and clean the TSC pump inlet filter located in the coolant tank, check for chips or debris buildup.

Replace filter if cleaning doesn't restore flow - clogged filters are often the primary cause

Check TSC Lines

Disconnect TSC supply line at spindle and activate M88 to test pump flow directly, looking for steady stream.

Use proper PPE when handling coolant lines under pressure

Verify Pressure Switch

Check TSC pump pressure switch connection and operation using DIAGNOSTICS > INPUTS to monitor switch state during pump operation.

Check Pump Motor Power

Navigate to DIAGNOSTICS > OUTPUTS and verify TSC PUMP output is active when M88 command is issued.

Output should show active state when TSC is commanded on

Test Motor Voltage

Measure voltage at TSC pump motor terminals during M88 command - should read 115VAC on standard Haas TSC pumps.

Only qualified personnel should perform electrical measurements on live circuits

Check Motor Amperage

Measure pump motor current draw - normal draw is 2-4 amps, no current indicates open motor, excessive current indicates seized pump.

Compare readings to nameplate values on pump motor

Verify Mechanical Operation

With power off, manually check if pump impeller turns freely by rotating motor shaft - should turn with minimal resistance.

Monitor Pressure Switch Input

Go to DIAGNOSTICS > INPUTS and observe TSC PRESSURE switch state while manually activating pump with M88.

Switch should close (show active) within 5-10 seconds of pump startup

Test Switch Continuity

With pump off, disconnect pressure switch and test continuity across switch terminals - should be open at zero pressure.

Ensure system is depressurized before disconnecting pressure switch

Verify Switch Pressure Setting

Check pressure switch setting matches system requirements - typically 15-25 PSI for Haas TSC systems.

Adjustable switches may have drifted from factory settings over time

Test Switch Operation

Apply shop air to switch inlet at proper pressure and verify electrical continuity changes from open to closed.

Check Parameter 378

Verify SETTING 378 (TSC PUMP ENABLE) is set to ON - navigate to SETTINGS and confirm parameter is properly configured.

Parameter 378 must be ON for TSC system to function

Reset NGC Control

Perform CONTROL RESET by pressing RESET button, then POWER UP/RESTART to clear any temporary control faults.

Save any active programs before performing control reset

Check Control Wiring

Inspect wiring connections at NGC control for TSC pump output and pressure switch input circuits.

Look for loose connections at terminal strips or damaged wire insulation

Verify Control Software

Check NGC software version in SETTINGS > VERSION and compare to latest available - older versions may have TSC control bugs.

Verify Coolant Level

Check TSC tank coolant level is above minimum mark and pump pickup tube is fully submerged.

Never run TSC pump with low coolant level as this will damage the pump

Prime TSC System

Fill system completely with coolant and use M88 command repeatedly to purge air from lines and pump housing.

May take several M88 cycles to fully prime system after maintenance

Check for Leaks

Inspect all TSC connections, fittings, and lines for external leaks that could cause air ingestion.

Small leaks on suction side can cause significant air ingestion problems

Verify Tank Venting

Ensure TSC tank vent is clear and not creating vacuum that prevents proper pump suction.