Synrad p250, User Manual, Page: 99 / 106

TROUBLESHOOTING STATUS LED’S PAGE | 99
Frequency Limit fault
Possible Causes:
• The 100 kHz PWM frequency limit has been exceeded.
Lasing is disabled when the input frequency limit is exceeded. When the input drops below 100 kHz, the
laser will begin lasing immediately at the commanded PWM parameters without cycling DC Power.
Duty Cycle/Pulse Width Limit fault
Possible Causes:
• The applied PWM Command signal is outside the laser’s operating parameters.
Lasing is disabled when a constant 5V signal (100% duty cycle) is applied. When the PWM duty cycle
drops below 100%, the laser will begin lasing immediately at its 50% PWM duty cycle limit. If the
commanded duty cycle is above 50% or the PWM pulse length exceeds 1000 μ s, adjust the pulse length
until the PWM input is brought within limits. The laser will then lase at the commanded PWM parameters.
When a duty cycle or pulse width limit fault is detected, the SHT LED flashes 3 blinks and the Fault
Detected output Closes to indicate (1) a constant 5V PWM signal is applied, forcing the PWM duty cycle
to 100%—full continuous wave operation; (2) the applied duty cycle is above the 50% limitation; or (3)
the applied pulse length exceeds 1000 μ s in duration. When condition 1 occurs, the laser begins lasing
immediately at 50% once the PWM duty cycle drops below 100%. For condition 2, the laser begins lasing
immediately at the commanded PWM parameters, the duty cycle is automatically limited to 50%. For
condition 3, the laser begins lasing immediately at the commanded PWM parameters, the pulse duration
is automatically limited to 1000 μ s.
Cleaning optical components
Debris or contaminants on external beam delivery components may affect laser processing and lead to
damage or failure of the optics and/or the laser.
Warning: Serious Personal Injury
Ensure that DC power to the laser is turned off and locked out before inspecting optical components
in the beam path.
Invisible CO2 laser radiation is emitted through the aperture. Corneal damage or blindness may result
from exposure to laser radiation.
A risk of exposure to toxic elements, like zinc selenide, may result when certain optical or beam
delivery components are damaged.
In the event of damage to laser, marking head, or beam delivery optics contact NOVANTA or the
optics manufacturer for handling instructions.