96-8100 1-15-96
HAAS AUTOMATION, INC.
TROUBLESHOOTING
SERVICE
MANUAL
VF-SERIES
22
5.3 LOW PRESSURE ALARM
´ Alarm 179 (Low Pressure Transmission Oil) has been triggered.
l Check for low oil supply in reservoir.
l Check to see that pump motor is running.
l Check for an air leak in the suction side of the pump.
l Check for a bad pressure sensor.
l Check for a broken or damaged cable.
l Check for a worn pump head.
6. THROUGH THE SPINDLE COOLANT
6.1 COOLANT OVERFLOW
To begin troubleshooting, check the alarm history to determine the problems cause before any action is taken.
´ Coolant pouring out of spindle head covers.
l Check for seal failure. If failure is found, replace the seal (seal / housing assy. kit #93-9000). Refer to the appropriate
steps in"TSC-Tool Release Piston Replacement" section for procedure.
l Check that the TSC drain line is intact. If necessary, replace with 5/32" O.D. X 32" long nylon tubing (24" long for VF-
O/OE)
l Check pre-charge pressure in accordance with TSC "Pressure Regulator Adjustment' section and reset if necessary.
Low pre-charge pressure can cause coolant to dump into the spindle head.
l Ensure the coolant pump relief valve has not been tampered with. (yellow paint band is intact). Check the coolant
pump pressure (should be 140 psi), with a standard tool holder in spindle. If pump pressure is above 140 psi, reset
the pump relief valve in accordance with the "Setting TSC Pump Relief Valve" section.
´ Excessive coolant flow out of drain line.
´ Pulsating flow through tool and drain line.
l Check pre-charge pressure in accordance with TSC "Pressure Regulator Adjustment" section. Reset precharge
pressure if necessary. Low pre-charge pressure will cause heavy or pulsating flow from the drain line.
l Ensure the coolant pump relief valve has not been tampered with (yellow paint band is intact). Check the coolant pump
pressure (should be 140 psi), with a standard tool holder in spindle. If pump pressure is above 140 psi, reset pump
relief valve in accordance with "Setting Pump Relief Valve" section.
6.2 LOW COOLANT
´ Alarm 151, "Low Thru Spindle Coolant"
l Check coolant tank level. Check the filter and intake strainer for any clogging. Check coolant lines for any clogging
or kinking. Clean or replace as needed.
l If received at start-up, check that the breaker hasn't tripped and that the pump is turning. Check the electrical
continuity of cables.
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