CONTINUOUS WAVE (CW) OPERATION
PAGE
|
38
Continuous wave (CW) operation
In some applications, such as high-speed marking or cutting, the time constant of the laser and the PWM
modulation causes a series of dots that may be visible on the marking surface instead of a “clean” line.
Operating the laser in CW mode will prevent this behavior from occurring. To operate the laser in CW
mode, a co5 VDC signal is applied to the PWM input(s) of the laser. This constant voltage source
forces the internal switching electronics to remain on, providing continuous and uninterrupted laser output
power.
For pure CW operation, a 5 V signal can be applied through this connector (a tickle signal must
be applied during laser-off periods). This input is optically isolated from the chassis and power supply
ground circuit but must not be subjected to common mode voltages greater than ±50 VDC from chassis
ground. The 32-1 laser has one PWM input that should always be driven identically from the signal source
by using a “Y” cable.
Gated operation
In many marking and cutting applications, the laser is required to pulse, or gate, on and off in
synchronization with an external control signal (typically from a computer or function generator operating
in the range from DC to 1 kHz). To pulse or gate the laser, connect a signal pro5.0 VDC pulses to
the Gate connector on the rear panel of the UC-2000.
Users who intend to use a gating signal should set the UC-2000’s gate input logic to internal Pull-Down
(normally off) mode. This prevents the beam from being enabled unless a high level (+3.5 V to +5.0 VDC)
signal is applied to the Gate input connector. In the pull-down (normally off) mode an asserted logic low
state, short circuit to ground, or an open or disconnected Gate input locks the beam off.
Many CO2 lasers operating in applications requiring short gating pulses at repetition rates below 500 Hz
will exhibit some leading-edge overshoot regardless of the PWM frequency. This occurs because a cooler
lasing medium (the CO2 gas) is more efficient than a hotter one. This overshoot is more pronounced at
lower gating frequencies since the gas has a longer time to cool down between PWM signal pulses.
Summary of Contents for 32-1 Laser
Page 1: ...ENGINEERED BY SYNRAD 32 1 Laser User Manual...
Page 19: ...32 1 LABEL LOCATIONS PAGE 19 32 1 label locations Figure 2 3 38 1 Hazard label locations...
Page 25: ...ELECTROMAGNETIC INTERFERENCE STANDARDS PAGE 25 Figure 2 1 32 1 Declaration Document...
Page 26: ...ELECTROMAGNETIC INTERFERENCE STANDARDS PAGE 26 Figure 2 5 continued 32 1 Declaration Document...
Page 41: ...I O FAULT DIAGRAMS PAGE 41 I O Fault Diagrams Table 4 6 DB 9 pin assignments...
Page 57: ...INDEX PAGE 1...
