technical reference
78
SYNRAD OEM v40 Operator’s Manual Version 4
Integrating Firestar safety features
The Laser Ready output closes when the laser is enabled (RDY LED illuminated yellow), indicating that
lasing is possible. The output is open (RDY LED o ) when lasing is disabled.
Note: A ve-second delay occurs between the time the Laser Ready output closes and 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 (SHT LED illuminated blue) and disabled when the shutter is Closed (SHT LED o ). The
SHT LED illuminates blue to indicate that DC power is applied to the RF driver.
For v40 OEM and Keyswitch-equipped lasers in automated systems, the shutter function is provided by the
Shutter Open Request signal via Pin 10 on the User I/O connector. To use this “remote shutter”, rst
place the Shutter Switch (if equipped) in the ON position. Applying a ±5–24 VDC signal between Pin 10,
Shutter Open Request, and Pin 11, Input Common, causes the SHT LED to illuminate and sends DC
power to the RF driver, enabling lasing after a ve-second delay. Removing the Shutter Open Request
signal removes DC power from the RF driver, extinguishing the SHT lamp. Lasing remains disabled until 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 to Pin 14, Shutter Open, and Pin 13, Output Common (see Figure 3-16). The Shutter
Open output closes when the Shutter Switch is Open and a Shutter Open Request signal is present (SHT
indicator illuminated blue). The output is open (SHT LED o ) when the Shutter Switch is Closed or the
Shutter Open Request signal is removed.
Note: A ve-second delay occurs between the time the Shutter Open output closes and 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 (INT LED illuminated green), if RDY and
SHT LEDs are illuminated, and disabled when the Remote Interlock signal is removed (INT LED red,
RDY LED o ). DC power is applied to the RF driver only when the INT LED is green and the RDY LED is
yellow (and the SHT LED is illuminated blue). Remote interlock functionality is provided by the Remote
Interlock signal via Pin 3 on the User I/O connector.
To use Firestar’s remote interlock feature, apply a ±5–24 VDC signal to Pin 3, Remote Interlock, and Pin
11, Input Common. Applying a Remote Interlock signal causes the INT LED to illuminate green and
sends DC power to the RF driver, which enables lasing after a ve-second delay (provided that the RDY
LED is yellow and the SHT LED is blue). Removing the Remote Interlock signal removes DC power from
the RF driver, causing the INT LED to turn red and the RDY LED to turn o. Lasing remains disabled
until a Remote Interlock signal is reapplied to Pin 3.
Your control system can monitor remote interlock status on the User I/O connector by connecting your
system’s input to Pin 15, Interlock Open, and Pin 13, Output Common (prior gure). This output is closed
when remote interlock circuitry is open (INT indicator illuminated red). The output is open (INT LED
green) when interlock circuitry is closed.
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