© 2016 SPI Lasers UK Ltd.
Commercial in Confidence
SM-S00500 Revision A 21 October 2016
redPOWER QUBE Cased Fiber Laser User Manual
If one process cabinet door interlock switch opens and recloses without the other interlock
switch opening, this is detected as a fault. If the pump diode PSU outputs do not agree with
the enable command within a 1 second time window, this is also detected as a fault.
The operating time of the E-Shutter is determined by the time taken to discharge the
capacitors at the output of the pump diode PSU through the dump resistors, and is typically
500ms. The E-Shutter circuits confirm that the pump diode PSU outputs have been
discharged to a voltage which is too low to operate the laser diodes. The E-Shutter has a
minimum cycle time specification of 5 seconds. Each time it operates the energy in the
capacitors must be dissipated by the dump resistors. Repeated cycling at less than the
minimum cycle time could overheat the resistors.
The connections to PL81 are shown in Figure 18.
Figure 18 Connections to PL81
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