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LASER TROUBLESHOOTING PAGE | 85
Symptom:
• The following status LED and I/O states exist:
LASE LED – Off Lase Indicator – Low (0V) Over-temp Fault – High (+5V)
Laser OK – Low (0V) RDY LED – flashing Laser Ready – Low (0V)
DC Voltage Fault – Low (0V) Voltage OK – High (+5V)
PWR LED – Green Temperature OK – Low (0V)
Possible Causes:
• Air-/fan-cooled lasers – an over temperature fault has occurred because 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 4.0 m3/min
(140 CFM) per fan at a maximum static pressure of 13.1 mm H2O (0.52 in H2O). To allow for proper
airflow, cooling fans must have at least 57.2 mm (2.25 inches) of unobstructed clearance between the
outside edge of the cooling fan housing and any mounting surface or enclosure.
•
Water-cooled lasers – an over temperature fault has occurred because coolant temperature is
above 22 °C (72 °F) or there is inadequate water flow through the laser.
Check that the chiller is maintaining a coolant temperature between 18 °C–22 °C (64 °F–72 °F) at a flow
rate of 3.8 lpm (1.0 GPM). If coolant temperature 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 one-gallon container; you should have close to one gallon of coolant. If there is much less
than one gallon in the container, check the cooling path for kinked or pinched cooling tubes and check
the chiller for a clogged or dirty filter.
Symptom:
•
The following status LED and I/O states exist:
LASE LED – Off Lase Indicator – Low (0V) Laser OK – Low (0V)
Voltage OK – Low (0V) RDY LED – Off Laser Ready – Low (0V)
Temperature OK – High (+5V) PWR LED – 1 blink code
Over-temp Fault – Low (0V) DC Voltage Fault – High (+5V)
Possible Causes:
•
An under-voltage fault exists.
An under-voltage fault occurs when input voltage drops to 20 VDC or below for more than 420 ms.
Check that the DC power supply is sup30 VDC under load, has a minimum current capacity of 15
A (air-/water-cooled) or 16 A (fan-cooled), and can sustain a 24 A peak for a minimum of 0.5 ms. After
correcting the problem, cycle DC power to reset the fault.