SIPART DR20 Project Planning Manual
Transmitter monitoring:
The measured values processed in this manner can be assigned to the monitoring circuit using
configuring switch S11. If one or more of the monitored variables violates the limits of -3 or
+103 %, the following is monitored on the four-digit display: " 1", " 2" or " Y". This message
remains until acknowledged using the pushbutton 8 (Fig. 2/1). The value which was last displayed
then appears again. If several inputs are faulty simultaneously, all are monitored simultaneously.
As shown, all individual signals are “OR”-ed together in addition. The fault message "MuSt" can be
transmitted via the digital output or the serial interface. It is simultaneously available for
programmed switchover to manual mode.
Square-root extraction:
The position of configuring switches S12 and S13 determines whether the controlled variables x1
and x2/wE are square-rooted. Negative input values are not square-rooted; in this case the output
value is set to zero.
Linearization:
The main controlled variable x1 can be linearized if required; this is selected using configuring
switch S14. Linearization is carried out using a polygon characteristic with eight straight lines
(see page 91 for setting and example).
The linearization circuit must always be used in the case of non-linear input values since
intermediate values can only be indicated correctly on the digital display in this manner. The
control response is also improved.
Digital input BE:
The controller has a digital input which acts normally (digital signal ≥ 13 V = logical 1) or inverted
(digital signal ≤ 4.5 V or open-circuit = logical 0) according to the position of configuring switch
S16. The function is assigned to the digital input by configuring switch S15 which has been
extended in software version A06 / A07:
Configuring switch
position of S15
Function of digital input
0 BL Blocking of manipulated variable. The last manipulated
variable current is retained in the K controller, the last duty
factor (heating or cooling output) is retained in the two-
position controller. A manipulated variable signal is no longer
output in the three-position step controller.
1 Si Safety manipulated variable. The manipulated variable
assumes the parameterized safety value (yS) in the K
controller, two-position controller and three-position step
controller with external position feedback. In the three-
position step controller with internal simulation of the position,
the manipulated variable tends towards zero if the
parameterized safety value is less than 50 %, and towards
100 % if the parameterized safety value is equal to or greater
than 50 %.
CB without acknowledgement
23
To Next Page
Loading...
Need help?
General
