maintenance/
troubleshooting
4
16
Synrad
Firestar i401
operator’s manual
Troubleshooting
On systems using remote interlocks, check to see that a positive or negative voltage in the range of ±5–24
VDC is applied to Pin 3,
Remote Interlock
, with respect to Pin 11,
Input Common
, on the
User I/O
con-
nector (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 by the following status LEDs and I/O states:
INT
LED
– Green
Interlock Open
– Open
TMP
LED
–
Red
Fault Detected
–
Closed
RDY
LED
–
Off
Laser Ready
–
Open
SHT
LED
– Off
Shutter Open
– Open
LASE
LED
– Off
Laser Active
– Open
Possible Causes:
■
Coolant temperature is above 28 °C (82 °F) or there is inadequate coolant flow through the laser.
Check that your chiller is maintaining a water temperature between 18 °C–28 °C (64 °F–82 °F) at a flow
rate of four gallons per minute (GPM).
If water temperature is OK, check the flow rate. The simplest way to do this, if a flow meter is not avail-
able, is to disconnect the cooling tubing from the chiller inlet (or the drain) and run the cooling water
for 30 seconds into a five-gallon bucket; you should have close to two gallons of water. If there is much
less than two gallons of coolant, check the cooling path for kinked or pinched cooling tubes or check the
chiller for a clogged or dirty filter.
On i401 lasers, the over-temperature fault (indicated by the
TMP
indicator turning red) is latched. This
means that if an over-temperature condition occurs the
TMP
indicator will turn red, the
Fault Detected
output will Close, the
RDY
light goes out, and lasing is disabled. Because of its latched condition, the
TMP
indicator will remain red even after the laser has cooled sufficiently to begin operation.
To reset an over-temperature fault, lower coolant temperature below 28 °C and then cycle DC power
(remove DC power, wait 30 seconds, reapply DC power). When the
RDY
indicator illuminates, lasing is
enabled after the five-second delay. If the
TMP
indicator remains red after cycling power, continue to flow
cooling water through the laser for a few more minutes and/or verify the coolant flow rate and then cycle
DC power again.
Symptom:
■
The
SHT
LED is flashing continuously because of a No-Strike condition as indicated by the follow-
ing status LEDs and I/O states:
INT
LED
– Green
Interlock Open
– Open
TMP
LED
– Green
Fault Detected
–
Closed
RDY
LED
– Yellow
Laser Ready
– Closed
SHT
LED
–
Blue (Flashing)
Shutter Open
– Closed
LASE
LED
– Off or Red
Laser Active
– Open or Closed
