535-PROF User's Manual
Chapter 7
85
Applications
NOTE:
Controller capabilities depend
upon the specified hardware option.
B. CONTROL TYPE
Software Configuration
1. Go to the
CONTROL
menu.
2. For the parameter
ALGORITHM
, select the type of 535 control:
•
ON-OFF
“Crude” control similar to a household thermostat. Used primarily on
slow, stable processes where moderate deviation (cycling) around
setpoint is tolerable. Only available with SSR, SSR Drive, and relay
outputs.
•
P
Proportional only control. Provides much better control than on/off. Used
on processes that are less stable or require tighter control, but have few
load variations and do not require a wide range of setpoints.
•
PI
Proportional plus integral control. In addition to proportional control, it
compensates for control errors due to wide range of setpoints or load
requirements. The integral term works to eliminate offsets.
•
PD
Proportional plus derivative control. In addition to proportional control,
it compensates for control errors due to fast load variations.
•
PID
Proportional plus integral plus derivative control. In addition to
proportional control, it compensates for changes in setpoint, load
requirements and process variations.
•
PID/ON-OFF
Only available with Duplex control. First output uses the PID algorithm,
while second output uses on/off control.
3. For algorithms using the derivative function (D), choose the conditions for
the derivative term:
Scroll to parameter
D. SOURCE
• For derivative action based on error, or deviation from setpoint, choose
DEVIATION
• For derivative action based on changes in the process variable, choose
PV.
Hardware Configuration
•
The 535 controller with profile option must be configured with an analog
milliamp module in the first available output.
•
See
Section H
in this chapter for instructions on configuring the retrans-
mission feature.
•
Up to four model 535 controllers can be used, each must be specified with
the remote setpoint option.
•
See
Section J
in this chapter for instructions on configuring the optional
remote setpoint feature.
