Novanta SYNRAD Pulstar p100, User Manual

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SHUTTER FUNCTIONS PAGE | 58
OEM lasers
On p100/150 OEM lasers, the RDY LED illuminates on DC power-up (when the Remote Interlock input is
enabled) and five seconds later, DC power is applied to the RF driver. When the Shutter Open Request
input is inactive (SHT indicator Off) no tickle pulse is applied to the laser. PWM Command signals are
enabled only when voltage is applied to both Shutter Open Request and Remote Interlock inputs (INT
LED green, RDY LED On, and SHT LED On). Over temperature faults are reset by removing and then re-
applying 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 five seconds later lasing is enabled.
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 begins a
five-second countdown 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 the figure above).
Important Note: When connecting field wiring to the Remote Reset/Start Request input, use
twisted pair and/or shielded cabling. Refer to NOVANTA® Technical Bulletin #021 for details. After
the Laser Ready output closes, a five-second delay occurs before lasing is enabled.
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 off) when lasing is disabled.
Shutter Functions
An electronic shutter is available on all lasers which disables the lasing circuitry but doesn’t physically
block the beam. Lasing is enabled when the shutter is open (SHT LED illuminated blue) and disabled
when the shutter is Closed (SHT LED off).
For p100/150 OEM lasers in automated systems, shutter actuation is provided by the Shutter Open
Request signal via Pin 10 on the User I/O connector. To use this feature, apply a voltage in the range of
±5–24 VDC to Pin 10, Shutter Open Request. This input signal causes the SHT LED to illuminate
(provided the RDY indicator is on) and opens the physical shutter to allow lasing. Removing voltage
from the Shutter Open Request input causes the physical shutter to close and block the beam path,
extinguishing the SHT lamp and allowing only tickle signals to reach the tube.
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 a Shutter Open Request signal is present (SHT LED illuminated blue), and the Laser
Ready output is closed (RDY LED is on). The output is open (SHT LED Off) when the Shutter Open
Request signal is removed, or the Laser Ready output is open (RDY LED is Off).
Remote Interlock Functions
Interlock circuits are often used to disable machinery when a shield, panel, or door is opened. ’s remote
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”.