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 T
emper-
ature
Controller performs ON/OFF control.
Pin 1 OFF: Temperature Controller performs ON/OFF.
Control output
ON
OFF
Set temperature
ON
165432
PX
ON
Set
pin 3
to ON when the T
emperature Controller is used to control a
cooling device, such as a freezer.
Control output
ON
OFF
Set temperature
ON
165432
PX
ON
PID Control
Set
pin 1 of the internal DIP switch to ON to make the
T
emperature
Controller
perform PID control. Follow the steps described below
.
Pin 1 ON: Temperature Controller performs PID control.
ON
165432
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 T
emperature Controller
, or when
using an exter
-
nal
relay or contactor
.
Control output
ON
OFF
20 seconds
ON
165432
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
165432
PX
ON
Determining Control Output Operation
If
the T
emperature
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
165432
PX
ON
Conversely,
if the T
emperature 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
165432
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
T
emperature 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.
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