technical reference
41
SYNRAD OEM v30 Operator’s Manual Version 2
0 VDC
5 VDC
100 µs
200 µs
200 µs
190 µs
5 kHz Command Signal at 50% Duty Cycle
5 kHz Command Signal at 95% Duty Cycle
Controlling laser power
Figure 4-3
PWM Command signal waveform
The v30’s PWM input (on either the Interface A or Interface B connector) consists of a high-speed
optoisolator LED with a forward voltage drop (Vf) of 1.5 VDC. The PWM input frequency can range from
DC (0 Hz) to 100 kHz. Table 3-2 provides minimum, maximum, and nominal PWM signal specifications.
Table 4-2
PWM Command signal levels
Laser State
Minimum
Nominal
Maximum
Laser Off
0.0 VDC
0.0 VDC
+0.8 VDC
Laser On
+3.5 VDC (5 mA)
+5.0 VDC (9 mA)
+6.7 VDC (10 mA), continuous
Frequency Range
0 Hz (DC)
5 kHz
100 kHz
Duty Cycle
0%
— —
100%
Operating modes
External control
In addition to controlling the OEM v30 laser using a UC-2000 Universal Laser Controller, control of the
v30 externally, without a UC-2000, is also possible. The two primary elements of laser control are gating,
the ability to turn the laser on and off at the appropriate times, and power, the ability to control the laser’s
output energy. Both gating and power can be handled by a device such as a personal computer, Program-
mable Logic Controller (PLC), or function generator capable of providing tickle pulses in addition to
sending PWM signals at the proper time (gating) and with the proper duty cycle (power).
Analog voltage or current control
Although OEM v30 lasers cannot be controlled directly by analog voltage or current signals, this type of
control is possible when using the UC-2000 Controller. The Controller is connected normally to the laser
and analog voltage or current signals sent to the UC-2000’s ANV/C connector then control both laser
gating and power.
To generate the correct analog voltage for the UC-2000 Controller from a computer or PLC, a Digital-to-
Analog (D/A or DAC) card capable of generating 0 V (laser off) to 10 V (maximum laser power) must be
installed. To generate the proper analog current, install a D/A card that can generate 4 mA (laser off) to
20 mA (maximum power). Software able to control your analog output card is required for either configu-
ration.
