OPERATIONAL FLOWCHART
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Possible Causes:
•
No voltage is 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 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 section for details).
Troubleshooting
For systems not using interlocks, wire a male DB-15 connector to the User I/O 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:
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 15.1 lpm (4.0 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.
