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4.3.1.1.4.21 Output Power Limit
In certain system the heater (or cooler) is over-designed such that the process is too heavily
heated or cooled. To avoid an excessive overshoot and/or undershoot the user can use the Power
Limit function. Output 1 power limit PL1 is contained in Configuration. If output 2 is not used for
cooling (that is COOL is not selected for OUT2), then PL2 is hidden. If the controller is used for
ON-OFF control, then both PL1 and PL2 are hidden
Example:
OUT2=COOL, PB1=10.0°C, CPB=50, PL1=50, PL2=80 the output 1 and output 2 will act as
following curves
Figure 4-52.Power Limit Function
NOTE:
The adjusting ranges of MV1 (H) and MV2 (C) for manual control and/or failure transfer are not
limited by PL1 and PL2.
4.3.1.1.4.22 Digital Filter
In certain application the process value is too unstable to be read. To improve this
programmable low pass filter incorporated in this Process Control Card can be used. This is a
first order filter with time constant specified by FILT parameter which is contained in setup menu.
The default value of FILT is 0.5 sec. before shipping. Adjust FILT to change the time constant
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