Synrad Novanta 48 Series, Manual, Page: 59 / 89

REMOTE INTERLOCK FUNCTIONS PAGE | 59
lasing is possible after the five-second delay. The output is inactive (PWR LED off) when lasing is disabled.
Refer back to Table 3-6, DB-9 pin assignments for specific details.
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 connects 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 DB-9
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, to 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 DB-9 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 3-6, DB-9 pin assignments for specific details.
Caution: Possible Equipment Damage
Do not apply a voltage to Pin 3, Remote Interlock Connection on the DB-9 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.
Caution: Possible Equipment Damage
Read guidelines for cutting and installing tubing before installation.
Assure you understand the guidelines before proceeding to the next step.
Make sure to connect the cooling system exactly as described for your particular laser.