GARDASOFT PP520, Руководство пользователя

Страница: 14 / 50

PP520 LED lighting controllers - User Manual
5 General description
The PP520 current controller provides repeatable intensity control of LED
lighting for machine vision applications. It includes the power supply,
intensity control, timing and triggering functions required for machine
vision systems.
LED lighting needs a constant current supply as small variations in voltage
can cause large variations in light output. Currents can be specified in
2.5mA steps to give very fine control of intensity.
You can set the PP520 up using either the buttons on the front panel (see
Section 9, Front panel configuration ), through its web pages (see Section
11, Webpage configuration ), or using Ethernet commands (see Section
12, Command configuration ).
Configurations are saved in non-volatile memory so that the PP520 will
resume operation after a power cycle.
5.1 Output modes
Three modes of operation are provided separately for each channel:
5.1.1 Continuous
In continuous mode the output is a fixed and continuous current. The
brightness can be set from 0% to 100%.
5.1.2 Pulsed
In this mode output is pulsed once per trigger. One trigger input is used to
trigger the output. The delay, pulse width and light intensity are all
configurable. In pulse mode, the brightness can be set up to 999% of its
rating, but only for short periods and low duty cycles so the lighting does
not overheat and get damaged. The default limits are as follows:
Brightness
Max pulse
width
PP520 Max pulse
width
PP520F
Max duty
cycle
0 to 100% 999ms 10ms 100%
101% to
200%
30ms 1ms 30%
210% to
300%
10ms 1ms 20%
301% to
500%
2ms 1ms 10%
501% to
999%
1ms 0.5ms 5%
— 14 —