maintenance/
troubleshooting
414
Synrad Firestar ti-Series operator’s manual
Troubleshooting
Symptom:
■ A remote interlock fault is indicated.
INT LED – Red Interlock Open output – Closed
TMP LED – Green Over Temperature output – Open
RDY LED – Off Laser Ready output – Open
SHT LED – Blue Shutter Open output – Closed
LASE LED – Off Laser Active output – Open
Possible Causes:
■ No voltage applied to Pin 3 (Remote Interlock) of the User I/O connector.
On systems using remote interlocks, check to see that a positive or negative voltage (±5–24 VDC) is applied
to Pin 3, Remote Interlock, with respect to Pin 11, Input Common, on the User I/O connector (refer
to User I/O connections in the Technical Reference chapter for details). For systems not using interlocks,
connect the factory-supplied Quick Start Plug to the User I/O connector on the laser’s rear panel or wire
your male DB-15 connector so that Pin 11 (Input Common) is jumpered to Pin 12 (Auxiliary DC Power
Ground) and Pin 3 (Remote Interlock) is jumpered to Pin 4 (+5 VDC Auxiliary Power).
Symptom:
■ An over temperature fault is indicated.
INT LED – Green Interlock Open output – Open
TMP LED – Red Over Temperature output – Closed
RDY LED – Off Laser Ready output – Open
SHT LED – Blue Shutter Open output – Closed
LASE LED – Off Laser Active output – Open
Possible Causes:
■ Water-cooled lasers – Cooling water temperature is above 30 °C (86 °F) or there is inadequate water
flow through the laser.
Check that the chiller is maintaining a coolant temperature between 18 °C–30 °C (64 °F–86 °F) at a flow
rate of 1.0–2.0 gallons per minute (GPM) for ti60 lasers; 1.5–2.0 GPM for ti100 lasers. If coolant tempera-
ture is OK, check the flow rate. If a flow meter is not available, disconnect the cooling tubing from the
chiller inlet (or the drain) and run the coolant for one minute into a five-gallon bucket; you should have
close to 1.0–2.0 gallons. If there is much less than one gallon in the bucket, check the cooling path for
kinked or pinched cooling tubes and check the chiller for a clogged or dirty filter.
Note: Water-cooled ti-Series lasers can be operated at coolant temperatures up to 30 °C to reduce prob-
lems associated with condensation; however, this may result in decreased laser performance and/
or reduced laser lifetime.
■ Fan-cooled lasers – Cooling fans are not providing adequate airflow to the laser.
Check that all cooling fans are clear of debris and are providing an airflow rate of at least 150 cubic feet
per minute (CFM) per fan for ti60 lasers. To allow for proper airflow, cooling fans must have at least 2.25
inches (57.2 mm) of unobstructed clearance between the outside edge of the cooling fan housing and any
mounting surface or enclosure.
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