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

16

5

4

3

2

PX

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

16

5

4

3

2

PX

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

16

5

4

3

2

PX

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

16

5

4

3

2

PX

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

16

5

4

3

2

PX

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

16

5

4

3

2

PX

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

16

5

4

3

2

PX

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.