© 2016 SPI Lasers UK Ltd.
Commercial in Confidence
SM-S00500 Revision A 21 October 2016
redPOWER QUBE Cased Fiber Laser User Manual
temperature of the base plate at the desired value using closed loop control. The temperature
is maintained within ±0.5°C of the set point by varying the open and close time of the solenoid
valve. The closer the inlet water temperature is to the set-point, the less frequently the valve
will have to operate.
For the most stable laser operation the water inlet temperature and the laser temperature set-
point should be the same. The optimum operating temperature will be the lowest value that is
above the local dew point at all times. In certain countries with large variation of dew point
over the year, it is preferable to optimise the set-point for different seasons.
The set point can be adjusted in the range 18°C to 30°C using FiberView.
8.4 Alarms and Warnings
8.4.1 Alarms
When the system detects an alarm condition, the QUBE Fiber Laser goes to the OFF state.
Alarm conditions include:
Optical Fault
Back reflection detected
Output Fiber over-temperature
Supply ‘brown-out’
Internal over-temperature
In the case of an optical fault, the QUBE Fiber Laser may enter Safe Mode. In this mode, the
QUBE Fiber Laser is limited to a pre-configured parameter set that will output a low energy,
low frequency pulse. This allows checks to be made without making any damage worse.
Optical fault detection needs to be sensitive enough react quickly to minimise damage.
However, there may be a potential for false detection of optical faults. In this case, the safe
mode recovery routine will take the QUBE Fiber Laser out of safe mode.
8.4.2 Warnings
A warning is generated by conditions which are of concern, but do not put the QUBE Fiber
Laser into the OFF state. Warnings are removed automatically when the condition is removed.
Warning conditions include:
Back Reflection approaching alarm level
Process cabinet door interlock switch open
Temperature(s) approaching alarm level(s)
QUBE Fiber Laser in Safe Mode
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