Novanta i401, Руководство пользователя

Страница: 116 / 133

OPERATIONAL FLOWCHART PAGE | 116
Symptom:
Your OEM i401 laser has quit lasing or lasing halted and then restarted. The LASE LED may be Off or On
depending on whether PWM Command signals are being applied, but no fault is indicated.
Possible Causes:
•
The remote interlock circuit momentarily opened.
Remote interlock faults are not latched on OEM lasers. This means that if an interlock open fault occurs,
the INT indicator will turn red, the Interlock Open output will Close, the internal shutter automatically
closes to block the beam path, the RDY LED turns Off, the SHT LED turns Off (regardless of the state of
the Shutter Open Request input), and all DC power is removed from the RF boards. However, if the
interlock circuit closes again, the INT indicator changes from red to green, the Interlock Open output
Opens, the RDY light illuminates, the SHT LED turns On, the internal shutter opens, and five seconds later
lasing is enabled.
Troubleshooting
Electrical noise on the Remote Reset/Start Request input has momentarily disabled the laser.
If you are operating in an industrial environment and experience brief intervals where the laser is com-
manded to lase, but does not, this behavior may be the result of noise-induced voltage transients on the
Remote Reset/Start Request input. When a typical noise-induced voltage transient occurs, the duration
can be long enough to cause input circuitry to disable lasing, but short enough that the RDY LED (and
Laser Ready output appear to remain switched on. When this transient noise occurs, lasing is disabled
until the mandatory five-second delay has timed out.
Electrical noise can unintentionally inhibit lasing because of (1) improperly shielded or grounded I/O wir-
ing or (2) excessive electrical noise generation around the laser; for example, from an improperly
shielded or grounded variable-frequency drive (VFD) or other electrically-noisy device. Refer to Novanta
Technical Bulletin #021 for detailed methods to prevent noise-induced voltage transients from activating
the Remote Reset/Start Request input.
Symptom:
Your OEM i401 laser has quit lasing. A PWM Command signal is being applied and no faults are
indicated, but the following status LEDs and I/O states exist: