Laser Safety - 3D Systems SLA 750 Series User Manual

2.2 Laser Safety

The SLA 750 uses a UV (ultraviolet) solid-state frequency tripled Nd:YVO4 laser which utilizes a 355 nm wavelength laser with a
maximum power output of 3 watts at the vat (EN/IEC 60825-1:2014). The laser is located in the Printhead area of the SLA 750.
The SLA 750 is a Class I (1) laser product. Class 1 products are not considered harmful and require no special safety precautions
under normal operating conditions. The laser beam is completely confined. The viewing windows in the Print Chamber block
the UV laser radiation from exposure outside of the print area.
Laser Radiation: Operating the equipment or performing procedures other than those specified within this
guide may result in exposure to hazardous, invisible laser radiation.
Laser Radiation: Never stare directly into a laser beam, nor into any beam reflection, whether diffused or
from a mirror-like surface.
Laser Radiation: During normal operation, and with all panels installed, the SLA 750 is classified as a Class I (1)
laser device . If any of the interlocks are defeated, the SLA 750 becomes a Class IV (4) device . Eye damage can
occur by looking directly into the beam or by viewing any type of beam reflection
Laser Radiation: Interlocks are to be defeated only by trained personnel when needed during service
procedures.
Embedded Laser Specifications
• Max output of laser radiation: 3W max average power
• Pulse duration: 10 ns, 80 kHz
• Emitted wavelength(s): 355 nm
• Name and publication date of the standard: EN/IEC 60825-1:2014
Control Switches
The locations of control switches are illustrated in the section Printer - Outside View. Master and Emergency power shut-off
switches are described in the following paragraphs.
Master Power Shut-off
The SLA 750 has a master circuit breaker switch located on the electrical cabinet module on the right side of the machine.
Emergency Stop
All SLA 750 printers have (3) Emergency Stop (E-Stop) buttons on the left-side of the UI panel, inside the print chamber and laser
assembly. They are bright red with a yellow background. Pressing one cuts power to all moving axes, closes the laser shutter,
and puts the laser in safe mode. To release the E-Stop, pull it out and turn it clockwise. The system cannot run while an E-Stop is
depressed. The SLA 750 Dual will have an additional E-Stop on its B-side Laser Assembly in the identical location seen below.
3D Systems, Inc. 3 p/n 40-D150, Rev. C