Programmable Relay ● User Manual for ELC, EXM and PR Series 134 2020 v6.0 ● © Rievtech Co.,
Ltd. ● www.rievtech.com
Parameter P (number of decimal places)
Only applies to portray the values from PV, SP, Min. and
Max. in a message text.
Timing Diagram
Nature, manner and speed with which the AQ changes
depend on the parameters KC and TI. Thus, the course of
AQ in the diagram is merely an example. A control action
is continuous; therefore, the diagram portrays just an
extract.
A disturbance causes the PV to drop, as Dir is
positioned upwards, AQ increases until PV
corresponds again to SP.
A disturbance causes the PV to drop, as Dir is
positioned downwards, AQ decreases until PV
corresponds again to SP.
Dir is coordinated with the basic conduct of a
control loop. The direction (dir.) cannot be
changed during the term of the function. The
change in Dir here is shown for the purposes of
clarification.
As AQ is set to 0 by means of the input R, PV
changes. This is based on the fact that PV
increases, which on account of Dir = upwards
causes AQ to drop.
Description of Function
If the input A/M is set to 0, then the special function issues
output AQ with the value that you set with parameter Mq.
If the input A/M is set to 1, then automatic mode
commences. As an integral sum the value Mq is adopted,
the controller function begins the calculations in
accordance with the formulas given in Control and
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