36
Selecting the Temperature Unit
Section 3-3
3-3
Selecting the Temperature Unit
3-3-1
Temperature Unit
• Either
°
C or
°
F can be selected as the temperature unit.
• Set the temperature unit in the “temperature unit” parameter of the initial
setting level. The default is
c
(
°
C).
Operating Procedure
The following example shows how to select
°
C as the temperature unit.
3-4
Selecting PID Control or ON/OFF Control
Two control methods are supported: 2-PID control and ON/OFF control.
Switching between 2-PID control and ON/OFF control is executed by means
of the “PID ON/OFF” parameter in the initial setting level. When this parame-
ter is set to
pid
, 2-PID control is selected, and when set to
onof
, ON/OFF
control, is selected. The default is
onof
.
2-PID Control
PID control is set by AT (auto-tuning), ST (self-tuning), or manual setting.
For PID control, set the PID constants in the “proportional band” (P), “integral
time” (I), and “derivative time” (D) parameters.
ON/OFF Control
In ON/OFF control, the control output is turned ON when the process value is
lower than the current set point, and the control output is turned OFF when
the process value is higher than the current set point (reverse operation).
3-5
Setting Output Specifications
3-5-1
Control Periods
• Set the output periods (control periods). Though a shorter period provides
better control performance, it is recommended that the control period be
set to 20 seconds or longer for a relay output to preserve the service life
of the relay. After the settings have been made in the initial setup, read-
just the control period, as required, by means such as trial operation.
• Set the control periods in the “control period (heating)” and “control period
(cooling)” parameters in the initial setting level. The default is 20 seconds.
• The “control period (cooling)” parameter is used only for heating/cooling
control.
• When control output 1 is used as a current output, “control period (heat-
ing)” cannot be used.
Operation Level
1.
Press the
O
key for at least three seconds to move from the operation
level to the initial setting level.
Initial Setting Level
2.
Select the “temperature unit” parameter by pressing the
M
key.
Press the
U
or
D
key to select either
°
C or
°
F.
c
:
°
C
f
:
°
F
3.
To return to the operation level, press the
O
key for at least one second.
C
30
0
in-t
5
Input type
d-u
c
Temperature unit
cp
c-cp
Control period
(heating)
Control period
(cooling)
Summary of Contents for E5AZ
Page 2: ...E5CZ E5CZ U E5AZ E5EZ Digital Temperature Controller User s Manual Produced September 2008 ...
Page 3: ...iv ...
Page 23: ...xxiv ...
Page 53: ...30 Using the Support Software Port Section 2 3 ...
Page 79: ...56 Using HB and HS Alarms Section 3 10 ...
Page 115: ...92 Output Adjustment Functions Section 4 14 ...
Page 173: ...150 Communications Setting Level Section 5 8 ...
Page 205: ...182 Index precautions 22 terminal arrangement 21 terminals 21 ...