EMERSON 1X00781H01L power module

EMERSON 1X00781H01L power module

Technical data of product parameters

With DZC outputs, the PID algorithm calculates an output between 0 and 100%, but the output is
distributed on a variable time base. For each ac line cycle, the controller decides whether the power 1X00781H01L
should be on or off. There is no fixed cycle time since the decision is made for each line cycle. When
used in conjunction with a zero crossing device, such as a solid state relay (SSR), switching is done
only at the zero crossing of the ac line, which helps reduce electrical noise.
Using a DZC output should extend the life of heaters. Since the time period for 60Hz power is
16.6ms, the switching interval is very short and the power is applied uniformly. DZC should be used
with SSRs. Do not use DZC output for electromechanical relays.
The combination of DZC output and a solid state relay can inexpensively approach the effect of 1X00781H01L
analog, phase-angle fired control. Note, however, DZC switching does not limit the current and
voltage applied to the heater as phase-angle firing does.The output filter digitally smooths PID control output signals. It has a range of 0 to 255 scans, which
gives a time constant of 0 to 170 seconds for a sixteen-loop controller, 0 to 85 seconds for an
eight-loop controller or 0 to 43 seconds for a four-loop controller. Use the output filter if you need to 1X00781H01L
filter out erratic output swings due to extremely sensitive input signals, like a turbine flow signal or an
open air thermocouple in a dry air gas oven.
The output filter can also enhance PID control. Some processes are very sensitive and would
otherwise require a large proportional band, making normal control methods ineffective. Using the
output filter allows a smaller proportional band to be used, achieving better control.
Also, use the filter to reduce the process output swings and output noise when a large derivative is
necessary, or to make badly tuned PID loops and poorly designed processes behave properly.

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