Auber Instruments DSPR300 Kullanım Kılavuzu - Sayfa 11
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Figure 6. A 25% output control signal from a PID controller in the time proportional firing mode. Cycle time is 1 second. The output signal is 250 millisecond (ms) on,
and 750 ms off during each cycle period.
Figure 7. The control signal and SSR output waveform overlaid. When the DC signal (Channel 2, square wave) is on, the AC power can go through (Channel 1).
When the DC signal drop to zero, the AC power is blocked.
3) Burst firing. This method is similar to time proportional firing (section 2). But in contrast to the time proportional mode, where the SSR is fired once for each fixed
cycle period (which are usually 2 seconds or longer), the regulator will find the minimum cycle time to achieve the desired output percentage. The on pulse can be as
short as one AC cycle. So power is distributed more evenly over cycle time. This leads to of a more uniform power output. Several PID controllers on the market use
this mode. Our DSPR also uses this approach as the default mode to regulate power.
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