E5CS-X
E5CS-X
8
Control Mode Selection
ON/OFF Control
Pin 1 of the internal DIP switch is factory-set to OFF, so the Temper-
ature Controller performs ON/OFF control.
Pin 1 OFF: Temperature Controller performs ON/OFF.
Control output
ON
OFF
Set temperature
ON
1
6
5
4
3
2
P
X
ON
Set pin 3 to ON when the Temperature Controller is used to control a
cooling device, such as a freezer.
Control output
ON
OFF
Set temperature
ON
1
6
5
4
3
2
P
X
ON
PID Control
Set pin 1 of the internal DIP switch to ON to make the Temperature
Controller perform PID control. Follow the steps described below.
Pin 1 ON: Temperature Controller performs PID control.
ON
1
6
5
4
3
2
P
X
ON
Determining Proportional Period
Set pin 2 of the DIP switch to OFF to select a proportional period of
20 seconds. This is used when PID control is performed with the
relay output of the Temperature Controller, or when using an exter-
nal relay or contactor.
Control output
ON
OFF
20 seconds
ON
1
6
5
4
3
2
P
X
ON
When a quick response is required, set pin 2 to ON to select a pro-
portional period of 2 seconds. Even when a solid-state relay (SSR)
is used, only set the 2-second proportional period where quick re-
sponse is essential. With a relay control output, a proportional peri-
od of 2 seconds will greatly reduce the service life of the relay.
Control output
ON
OFF
2 seconds
ON
1
6
5
4
3
2
P
X
ON
Determining Control Output Operation
If the Temperature Controller is used to control a heater, the control
output can be set to perform reverse (inverted) operation. Set pin 3
of the control output mode selector switch to OFF.
Reverse output
ON
OFF
Set temperature
ON
1
6
5
4
3
2
P
X
ON
Conversely, if the Temperature Controller is used to control a cool-
ing device such as a freezer, set pin 3 to ON.
Normal output
ON
OFF
Set temperature
ON
1
6
5
4
3
2
P
X
ON
When power is first turned ON, the proportional band is set to 3%.
The optimum proportional band, however, is automatically calcu-
lated and set within the range 3% to 20%, according to the changes
in the temperature of the controlled system. This automatic adjust-
ment of the proportional band is possible regardless of whether the
controlled system is a heating or cooling system.
When the power is turned OFF once, and then ON again, the control
starts with the previous proportional band. A new proportional band,
however, is automatically calculated and set.
The calculation of the proportional band is not carried out, however,
if the temperature of the controlled system changes at a rate faster
than 7.5% of the full scale per 2 seconds (e.g., faster than 3.75
°
C
per second with a full scale of 100
°
C). In this case, the previously
calculated and set proportional band is used.
The Temperature Controller is provided with an overshoot preven-
tion function that suppresses the second overshoot and those that
follow to a level less than the initial overshoot.
