3D Systems, Inc.
20
p/n: 15-D100, rev. D
2.6.2 Shut-off Matrix
The shut-off matrix differentiates the following seven safety groups:
• The emergency off group (fan cooling blower, blower, vacuum pump, laser, scanner and stepper motor)
• The safety group (vacuum pump and blower)
• The laser group
• The coater on the RPM
• Compressed air supply
• Argon gas supply
A.
Emergency Off
Emergency off, all safety groups stop or do not start.
These do not stop: the safety PLC, the 24 V DC electrical power features and the built-in computer.
B. Door of the Process Chamber
Process chamber door is open:
• The safety motor group stops or does not start.
• Laser stops or do not start.
• The coater and the steering of the build plate within the RPM stop or does not start
• The coater can be moved with the correct software activation and the ‘hold-to-run’ button
C. Pressure in the Process Chamber
Pressure in the process chamber is under 150 mbar, the laser stops or does not start.
D. Oxygen in the process chamber
Oxygen level in the process chamber is over 2% or 230 ppm, the laser stops or does not start.