E5CS-X
E5CS-X
42
Determining Control Output Operation
If the temperature controller is used to control a heater, the con-
trol output can be set to perform a reverse (inverted) operation.
Set switch 3 of the control output mode selector switch to OFF
Reverse
ON
output
OFF
Set temperature
Switch 3 OFF:
Controller performs reverse operation
used with heaters.
ON
1
6
5
4
3
2
P
X
ON
By contrast, if the temperature controller is used to control a
cooling device such as a chiller or freezer, set switch 3 to ON.
Normal ON
output
OFF
Set temperature
Switch 3 ON:
Controller performs normal operation for
cooling.
ON
1
6
5
4
3
2
P
X
ON
Auto-tuning of Proportional Band
Upon the initial power-up the proportional band is set to 3%. The
optimum proportional band width, however, is automatically
calculated and set within the range of 3 to 20%, according to the
changes in the temperature of the controlled system. This
automatic adjustment of the proportional band is performed
regardless of whether the controlled system is a heating or
cooling system.
When the power is turned OFF once, and the ON again, the con-
trol action starts with the previous proportional band. However,
the new proportional band is automatically calculated and set.
The calculation of the proportional band, however, is not carried
out if the temperature of the controlled system changes at a
faster rate than 7.5% of full scale per 2 seconds (e.g., faster then
3.75% per
°
C per second with eh full scale of 100
°
C). In this
case, the previously calculated and set proportional band is used.
The temperature controller has an overshoot suppression
function that reduced second and subsequent overshoots to a
level less than the initial overshoot.
J
INPUT SHIFT FUNCTION
The temperature indication can be shifted by setting switch 4 of
the function selector DIP switch to ON, and pressing the mode
key repeatedly until the message “H0” (indicating ) input shift) is
displayed on the main display. Then set the shift value by using
the Up or Down key.
Switch 4 ON: Input shift function enabled.
ON
1
6
5
4
3
2
P
X
ON
Fine adjustment of the temperature indication and the resulting
controlled temperature is possible without changing or affecting
the set point.
The input shift value can be set within the range from –99.9 to 99
(
°
F or
°
C).
For ranges that have resolution to 0.1, the input shift value can
be set within the range from –9.9 to 9.9 (
°
F or
°
C. The input shift
function may be useful to make small temperature corrections to
the control system.
Note that the offset value remains effective even after switch 4
has been set to OFF. If the compensation action is not needed,
be sure to set the offset value to 0.
For example:
D
correction of known sensor calibration errors
D
correction of known steady temperature offset between the
heated work piece (load) and sensor. This is useful for
applications where the sensor cannot be located exactly at
the work piece.
D
alignment of temperature indications in a
multi-zone/multi-controller application, e.g., at ambient
temperature
Note that the input shift changes the value of the controlled
temperature when used in closed loop control. For example, with
a set point and indication of 100
°
C and input shift set at +10
°
C,
the controlled temperature will be 90
°
C.
Main
display
Set input
shift value
Temperature
measured by
sensor
Displayed
temperature
h 0
h 9
l 9
0 offset
offset by +9
°
offset by –9
°
100
°
C
100
°
C
100
°
C
100
°
C
109
°
C
91
°
C
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MATCHING THE CONTROLLER TO
SENSOR STANDARD
Use switch 5 of the function selector DIP switch to match the
controller to the thermocouple or RTD sensor to be used.
With switch 5 ON, the controller will accept DIN standard
sensors. With switch 5 OFF, the controller accepts JIS standard
sensors.
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SELECTING SCALE INDICATION
Some dual-scale (
°
C/
°
F) temperature scale ranges may be
selected by rotary DIP switch. To specify the scale indication to
be displayed, used switch 6 on the in-line function selector DIP
switch.
With switch 6 set to ON, the controller displays Fahrenheit scale.
With switch 6 set to OFF, the controller displays Celsius scale.
