535-PROF User's Manual
Chapter 7
91
Applications
PID OUTPUT
PARAMETER SETTINGS
ACTION:1 = DIRECT
ACTION:2 = REVERSE
PID OFST.:1 = 0
PID OFST.:2 = 0
LOW OUT = 0
HIGH OUT = 100
REL. GAIN = 1.0
100%
100%
50%
100%
0%
Out 1
(Heat)
Out 2
(Cool)
0%
0%
Out 2
Out 1
Out 2
Out 1
PID OUTPUT
100%
PARAMETER SETTINGS
ACTION:1 = REVERSE
ACTION:2 = DIRECT
PID OFST.:1 = 0
PID OFST.:2 = 0
LOW OUT = 0
HIGH OUT = 100
REL. GAIN = 1.0
100%
50%
100%
0%
Out 1
Out 2
Out 1
Out 2
0%
0%
Duplex Output State Examples
The following Duplex examples represent a variety of ways this function can be
set up. PID control examples show the PID output percentage on the horizontal
axis, and On/Off control examples show the process variable on the horizontal
axis. The vertical axes are the output of each physical output. Most of these
examples use the first output as heating and the second output as cooling.
When using PID control, the 535 controller actually displays the PID output. To
relate this output to the actual physical output, locate the PID output on the
horizontal axis. Draw a vertical line at that point. At the intersection of this vertical
line and the respective output line, draw a horizontal line. The physical output is
the value where this horizontal line intersects the respective axis.
The illustrations assumes a manual reset/load line term of 50%. Therefore, at
zero error (process variable equals setpoint) the PID output is 50%.
Duplex with reverse and direct acting outputs
A reverse acting output 1 and a direct acting output 2 with: no offset, no restrictive
outputs limits, and a neutral relative gain with PID control.
Duplex with direct and reverse acting outputs
A reverse acting output 1 and a direct acting output 2 with: no offset, no restrictive
output limits, and a neutral relative gain with PID control.
Figure 7.3
Duplex with reverse and direct acting
outputs
Figure 7.4
Duplex with direct and reverse acting
outputs
