Synrad Novanta 48 Series, Manual, Page: 58 / 89

INTEGRATING SERIES 48 SAFETY FEATURES PAGE | 58
Integrating Series 48 safety features
• The Integrating Series 48 safety features section includes subsections:
• Remote Keyswitch functions
• Remote interlock functions
The Series 48 DB-9 Connector allows system integrators or end-users to integrate Series 48 laser safety
features into their control system. In particular, the Series 48 Remote Keyswitch and Remote Interlock
functions serve to disable DC power to the laser’s RF driver. Without power, the RF driver cannot supply
PWM Command or tickle signals to the resonator, causing the CO
2
gas to remain in a zero-energy state.
Remote keyswitch functions
Keyswitch lasers
After DC power-up, or after a fault or open interlock condition, the Keyswitch must be toggled to reset
the laser, which enables the PWR LED and signals that DC power is applied to the RF driver. Over
temperature faults are reset by removing, then reapplying DC power after the laser has cooled.
For Keyswitch lasers in automated control systems, this reset function is provided by the Remote Key-
switch signal via pins 6 and 7 on the DB-9 Connector. To use this “remote keyswitch” functionality, first
place the Keyswitch in the ON position. To reset a fault condition, open and then close a “dry-circuit” (zero
voltage) switch or relay contact between Pin 6, Remote Keyswitch Input, and Pin 7, Remote Keyswitch
Output. Reconnecting Pin 6 to Pin 7 applies power to the RF driver and begins a five-second delay after
which lasing is enabled. The RF driver is disabled when the remote keyswitch circuit is open.
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.
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
On OEM lasers, the PWR LED illuminates on DC power-up and five seconds later DC power is applied to
the RF driver. To reset a fault condition, remove DC power for 30 seconds and then reapply power to the
laser or toggle (open, then close) the Remote Keyswitch signal via pins 6 and 7 on the DB-9 Connector.
To use this “remote reset” functionality, open and then close a “dry-circuit” (zero voltage) switch or relay
contact between Pin 6, Remote Keyswitch Input, and Pin 7, Remote Keyswitch Output. Reconnecting Pin
6 to Pin 7 applies power to the RF driver 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