204
E5❑JE5❑J
Step-Response Tuning
Deviation
immediately
after set
point
Maximum
Step-response
PIDManipulated
Set
Process
Disturbance Tuning
Stable
range
SP
Outside stable
range here Disturbance tuning
takes place here
Linear voltage, 0 to 5 VDC, 1 KΩE53-V35
Current transformers 5.8 mm (0.23 in) dia. hole E54-CT1
for heater burnout function 12.0 mm (0.47 in) dia. hole E54-CT3
■ COMMUNICATIONS BOARDS FOR E5AJ, E5EJ CONTROLLERS
Output Write to temperature controller Read from temperature controller Part number
RS-232C Set temperature, alarm value Set temperature, alarm value, proportional E53-J01
RS-422 proportional band, integral time, band, reset time, rate time, output variable E53-J02
RS-485 rate time, event input. set limits, process value E53-J03
■ ACCESSORIES
Description Part number
NEMA 4 covers For E5CJ, 1/16 DIN size Y92A-48N
For E5EJ, 1/8 DIN size Y92A-49N
For E5AJ, 1/4 DIN size Y92A-96N
■ REPLACEMENT PARTS
Description Part number
Panel mounting adapter for E5CJ, supplied with each unit Y92F-30
■ TEMPERATURE RANGES
Input type Thermocouple Platinum RTD
(switch selectable) Type K Type J and L Type T and U Type N 100 Ω
Temperature °C -200 to 1,300 -100 to 850 -199.9 to 400.0 -200 to 1,300 -199.9 to 650.0
range °F -300 to 2,300 -100 to 1,500 -199.9 to 700.0 -300 to 2,300 -199.9 to 999.9
Unit of measure (main 1° C/F 1° C/F 0.1° C/F 1° C/F 0.1° C/F
setting and alarm
Omron's "J" series controllers use fuzzy
adaptive tuning to continuously monitor
and optimize PID constants while the
controller operates. Three tuning
algorithms are used to recalculate the
PID constants within 500 ms
after
the
process value stabilizes at set point:
• Step-response method
• Disturbance tuning
• Hunting tuning.
Step-Response Method
This tuning method takes place on start-
up and after an upward set point change
heating applications or a downward set
point change in a cooling application.
Step-response tuning changes mainly
impact the proportional band.
Disturbance Tuning
This tuning method takes place when the
temperature exceeds the stable range
between one and three times before
settling back to set point. Changes in
tuning are mainly made to the derivative
(rate) time.
Hunting Tuning
This tuning method takes place when the
temperature exeeds the stable range four
or more times before settling back to set
point. Changes in tuning are mainly
made to the integral (reset) time.
■ GET THE ADVANTAGE OF ADAPTIVE TUNING USING THREE ALGORITHMS
Comparison of E5❑J and E5❑X
Tuning Methods
Omron's "X" series controllers attempt to
optimize the PID constants by using a
limit cycle auto-tune. Although effective in
most applications, this method has some
drawbacks. For example, the auto-tuning
must induce an upset into the process in
order to make the process oscillate four
times. In many processes these types of
artificial upsets are not desirable.
Adaptive tuning controllers do not induce
an upset; instead, they use information
from the actual process, eliminating
unnecessary oscillations and enabling
quicker start-up time.
Another drawback of the limit cycle auto-
tune method is that PID constants will
only be effective so long as the same
basic conditions that were present when
the auto-tune took place remain constant.
Various factors such as a load change,
heater performance degradation or set
point changes can cause the auto-tuned
values to be less than optimum. The new
adaptive tuning method, however, is
continually monitoring the process and will
automatically adjust the PID constants
whe nprocess parameters (i.e., heater
degradation, load change, etc.) vary.
Hunting Tuning
Stable
range
Hunting
waveform
monitored
Extreme value
PID before tuning PID after tuning
SP
*Note: If control period is less than 5 seconds, use solid state relay or voltage relay.
■ CONTROL OUTPUTS FOR 1/4 AND 1/8 DIN MODELS, CURRENT TRANSFORMERS(continued)