Synrad Novanta OEM ti Series, User Manual

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INTEGRATING TI-SERIES SAFETY FEATURES PAGE | 70
Integrating ti-Series safety features
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Keyswitch functions
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Shutter functions
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Remote interlock functions
DB-15 User I/O connector allows system integrators or end-users to integrate safety features into their
control system. Keyswitch, shutter, and remote interlock functions serve to enable or disable DC power
to the RF drive. Without DC power, the RF driver cannot supply RF energy to the resonator, causing the
CO
2
gas to remain in a zero-energy state. Status indicators provide users with a quick visual indication of
the laser’s operational status. All power to the laser’s RF driver is removed whenever RDY or SHT
indicators are Off (Laser Ready or Shutter Open outputs open).
Keyswitch functions
Keyswitch lasers
After DC power-up or after a remote interlock fault, the Keyswitch must be toggled OFF/ON to reset the
laser and enable the RDY LED, signaling 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-equipped lasers in automated systems, this keyswitch/reset function is available via the
Remote Reset/Start Request input on Pin 2 of the User I/O connector. To use this “remote keyswitch”
functionality, first place the Keyswitch in the ON position. Then after each DC power-up cycle (or to
reset a fault condition), apply a momentary voltage pulse in the range of ±5–24 VDC to Pin 2, the
Remote Reset/Start Request input. Removing voltage allows DC power to reach the RF driver and
begins a five-second delay after which lasing is enabled (RDY LED illuminates yellow). The RF driver is
disabled as long as voltage is applied to Pin 2.
Your control system can monitor the laser’s ready status on the User I/O connector by connecting your
system’s input between Pin 8, Laser Ready, and Pin 13, Output Common (see Figure 3-16). The Laser
Ready output closes when the laser is enabled (RDY LED illuminated yellow), indicating that lasing is
possible. The output is open (in a high-impedance state) and the RDY LED is off when lasing is disabled.
Important Note: After the Laser Ready output closes, a five-second delay occurs before lasing is
enabled.
OEM lasers
On OEM lasers, the RDY LED illuminates on DC power-up (provided that Shutter Open Request and
Remote Interlock inputs are enabled) and DC power is applied to the RF driver. Over temperature faults
are reset by removing and then reapplying DC power after the laser has cooled. Remote interlock faults
are not latched; the RDY LED illuminates yellow as soon as the interlock circuit is closed (when the INT
LED turns from red to green) and lasing is enabled immediately.
Although a Remote Reset/Start Request input is not required to reset OEM faults, it can be used to
inhibit (disable) lasing. Disable the laser by applying a voltage in the range of ±5–24 VDC to Pin 2, the
Remote Reset/Start Request input. Removing voltage allows power to reach the RF driver and lasing is
enabled (RDY LED illuminates yellow) immediately. The RF driver is disabled as long as voltage is
applied to Pin 2.