Synrad p250, User Manual, Page: 97 / 106

TROUBLESHOOTING STATUS LED’S PAGE | 97
If water 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 cooling water for 30 seconds into a five-gallon
bucket. After 30 seconds, a minimum of 1.5 gallons or (5.8 L) should be collected. If there is less than 1.5
gallons or (5.8 L), check the cooling path for kinked or pinched cooling tubes or check the chiller for a
clogged or dirty filter.
On p250 lasers, the over-temperature fault is indicated by a red TMP indicator (latched status). If an
over-temperature condition occurs, the TMP indicator will turn red, the Fault Detected output will latch,
and the RDY indicator light will turn off. Lasing will become disabled. Due to the 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.
Under Voltage fault
An under-voltage fault occurs when DC input voltage falls below a preset limit of 46.5 VDC. This fault is
indicated by the RDY LED flashing 1 blink. The Laser Ready Output Opens under these conditions. To
reset an under-voltage fault, first correct the voltage problem and ensure that 48 VDC is measured at
the laser’s DC power terminals. Next, cycle DC power off and then on again. When the RDY LED
illuminates, the Laser Ready output Closes, and lasing is enabled after the five-second delay. Apply a
PWM Command signal, provided the SHT indicator is illuminated blue.
Over Voltage fault
An over voltage fault occurs when DC input voltage rises above a preset limit of 49.5 VDC. This fault is
indicated by the RDY LED flashing 2 blinks. Under these conditions the Laser Ready output Opens. To
reset an over voltage fault first correct the voltage problem and ensure 48 VDC is measured at the
laser’s DC power terminals. Next, cycle DC power off and then on again. When the RDY LED illuminates,
the Laser Ready output Closes, and lasing is enabled (after a five-second delay) provided a PWM
Command signal is applied, and the SHT indicator is illuminated blue.
RF Drive Switch fault
An RF Drive Switch fault occurs during power-up. RF drive switch faults are triggered by either of the
following: the tube fails to breakdown, or the RF Driver’s 48-volt switching circuitry fails. A RF drive
switch fault is indicated when the RDY LED flashes 3 blinks and the Laser Ready output Closes. If a RF
Drive Switch fault occurs, the laser requires service-Contact Contact NOVANTA Customer Service or a
NOVANTA Authorized Distributor.
PWM Drive fault
A PWM Drive fault signals a problem in the laser’s internal RF circuitry and is indicated by a flashing RDY
LED that blinks 4 times. If a PWM Drive fault appears, the laser requires service— please contact
NOVANTA Customer Service or a NOVANTA Authorized Distributor.