technical reference
327
Synrad Firestar f-Series operator’s manual
Integrating Firestar safety features
The Laser Ready output closes when the laser is enabled (Ready LED illuminated yellow), indicating that
lasing is possible. The output is open (Ready LED o ) when lasing is disabled.
Note: After the Laser Ready output closes, a ve-second delay occurs before lasing is enabled.
Shutter functions
A mechanical Shutter Switch is installed on all Keyswitch-equipped lasers. Lasing is enabled when the shut-
ter is Open (Shutter LED illuminated blue) and disabled when the shutter is Closed (Shutter LED o). The
Shutter LED illuminates blue to indicate that DC power is applied to the RF driver.
For f-Series OEM and Keyswitch-equipped lasers in automated systems, the shutter function is provided by
the Shutter Open Request input on Pin 10 of the User I/O connector. To use this “remote shutter”, rst
place the Shutter Switch (if equipped) in the ON position and then apply a voltage in the range of ±5–24
VDC to Pin 10, Shutter Open Request. This input signal causes the Shutter LED to illuminate and sends
DC power to the RF driver, enabling lasing after a ve-second delay. Lasing is disabled until the manual
Shutter Switch is placed in the Open position and a Shutter Open Request signal is applied to Pin 10.
Your control system can monitor the laser’s shutter status on the User I/O connector by connecting your
system’s input between Pin 14, Shutter Open, and Pin 13, Output Common (see Figure 3-16). The Shut-
ter Open output closes when the Shutter Switch is Open and a Shutter Open Request signal is present
(Shutter LED illuminated blue). The output is open (in a high-impedance state) and the Shutter LED is o
when the Shutter Switch is Closed or the Shutter Open Request signal is removed.
Note: After the Shutter Open output closes, a ve-second delay occurs before lasing is enabled.
Remote interlock functions
Interlock circuits are often used to disable machinery when a shield, panel, or door is opened. Firestar’s re-
mote interlock function allows you to connect into an external remote interlock circuit and prevent lasing
by removing DC power from the laser’s RF driver boards when the circuit is electrically “open”.
Lasing is enabled when a Remote Interlock signal is present (Remote Interlock LED illuminated green), if
Ready and Shutter LEDs are illuminated, and disabled when the Remote Interlock signal is removed (Re-
mote Interlock LED red, Ready LED o). DC power is applied to the RF driver only when the Remote Inter-
lock LED is green and the Ready LED is yellow (and the Shutter LED is illuminated blue). Remote interlock
functionality is provided by the Remote Interlock input signal on Pin 3 of the User I/O connector.
To use Firestar’s remote interlock feature, apply a voltage in the range of ±5–24 VDC to Pin 3, Remote
Interlock. Applying an interlock signal causes the Remote Interlock LED to illuminate green and sends DC
power to the RF driver, which enables lasing after a ve-second delay (provided that the Ready LED is
yellow and the Shutter LED is blue). Removing the interlock signal removes DC power from the RF driver,
causing the Remote Interlock LED to turn red and the Ready LED to turn o. Lasing remains disabled until
a Remote Interlock signal is reapplied to Pin 3.
Your control system can monitor the laser’s remote interlock status on the User I/O connector by con-
necting your system’s input to Pin 15, Interlock Open, and Pin 13, Output Common (see Figure 3-16).
This output is closed when remote interlock circuitry is open (Remote Interlock LED illuminated red). The
output is open (in a high-impedance state) and the Remote Interlock LED is green when interlock circuitry
is closed.
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