technical reference
317
Synrad
Series 48Series 48
Series 48Series 48
Series 48 operator’s manual
Integrating Series 48 safety features
Remote interlock functions
Keyswitch lasers
Interlock circuits are often used to disable machinery when a shield, panel, or door is opened. The Series
48 remote interlock wires directly into an external, zero-voltage remote interlock circuit to prevent
lasing by removing DC power from the laser’s RF driver boards when the circuit is electrically “open”.
Remote interlock functionality is provided by the Remote Interlock Connection via pin 3 on the DB9
Connector. Lasing is enabled when the Remote Interlock Connection signal is closed and disabled when
the Remote Interlock Connection signal is electrically “open”. DC power is applied to the RF driver
only when the Remote Interlock Connection signal is closed (PWR LED is illuminated). When the
Remote Interlock Connection is opened and then closed, you must toggle the Keyswitch or Remote
Keyswitch Input to reset the laser.
To use the Series 48 remote interlock feature, connect pin 3, Remote Interlock Connection, through
your “dry-circuit” (zero-voltage) interlock circuit and then ground the circuit to pin 2 or pin 4, Signal
Ground.
Lasing is enabled when pin 3 is grounded (when the external interlock circuit is closed). If the external
interlock circuit opens, then pin 3 opens and lasing is disabled. To enable lasing again, you must close
the interlock circuit and toggle the Keyswitch or Remote Keyswitch Input. This resets the laser and
begins a five-second delay after which lasing is enabled.
Your control system can monitor the laser’s power-on status through the DB9 Connector by connecting
your system’s input between pin 9, Remote Ready LED Output, and pin 2 or pin 4, Signal Ground. The
Remote Ready LED Output goes active when the laser is enabled (PWR LED turns On), indicating that
lasing is possible after the five-second delay. The output is inactive (PWR LED off) when lasing is
disabled. Refer back to Table 3-4, DB9 pin assignments for specific details.
Important Note: Pin 9, the Remote Ready LED Output, is a current- and voltage-limited output
meant only for direct connection to an LED or LED-input optoisolator.
OEM lasers
The remote interlock function is internally bypassed on OEM lasers; to enable this feature, please consult
the factory for details.
Caution
possible
equipment
damage
Do not apply a voltage to pin 3, Remote Interlock Connection on
the DB9 Connector, the laser will be damaged. This input is a "dry-
circuit" (zero voltage) input and must be grounded to either pin 2 or
pin 4 to complete the interlock circuit.
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