Applicable Systems
YLS-2000
Symptoms
The IPG YLS fiber laser system reports alarm 5.9 Pulse too short. The laser detects that the programmed pulse width is below the minimum threshold supported by the laser hardware. The emission is interrupted and the laser enters a fault state, preventing output until the alarm is cleared.
Possible Causes
- Programmed pulse width parameter set below the laser minimum pulse duration specification (typically 0.1 ms for YLS series)
- Control software or external controller sending pulse commands with incorrect timing parameters
- Pulse generator or modulation signal cable fault causing signal distortion or timing errors
- Laser controller firmware version mismatch with the pulse control module leading to incorrect pulse width interpretation
Troubleshooting Steps
- Step 1: Check the programmed pulse width parameter in the LaserNet software or the external controller
Pulse width must be at or above the minimum value specified in the YLS manual for the current operating mode - Step 2: Verify the modulation signal cable connection between the external controller and the laser modulation input port
Cable should be securely connected with no bent pins; signal integrity should be verified with an oscilloscope if available - Step 3: If using an external pulse generator, verify the output pulse width with an oscilloscope at the laser input
Measured pulse width should match the programmed value and exceed the laser minimum specification - Step 4: Update the laser controller firmware to the latest version if a firmware mismatch is suspected
Firmware version should match the version listed in the YLS manual for the installed hardware revision - Step 5: After resolving the pulse width parameter, reset the alarm and test with a valid pulse program
Laser should emit without triggering alarm 5.9
How to Reset
To reset: 1) Correct the pulse width parameter to at least the minimum specified value. 2) Press RESET on the laser controller or clear the alarm in LaserNet software. 3) Re-run the pulse program. Caution: Repeatedly triggering this alarm may indicate a systematic programming error that should be corrected in the process recipe to prevent production interruptions.
Frequently Asked Questions
- Q: What is the minimum pulse width for the IPG YLS series?
The minimum pulse width for the IPG YLS series depends on the model and operating mode. For the YLS-2000 in pulsed mode, the typical minimum is 0.1 ms (100 microseconds). Refer to the specifications section of the YLS User Manual for the exact value applicable to your hardware revision.
- Q: Can I use an external pulse generator with the YLS?
Yes, the YLS supports external modulation via the modulation input port. The external signal must meet the voltage and timing specifications in the YLS manual. Using a signal outside the specified range can trigger alarm 5.9 and potentially damage the modulation input circuitry.
Source: IPG YLS Series Fiber Laser User Manual - Alarm Code List; IPG Photonics YLS Series Basic Training, Troubleshooting Module
Category: Laser