5input sensor type, 6output function – Dwyer SCD User Manual
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5
INPUT SENSOR TYPE
Input Selection for SCD series:
Input Sensor Type
Register Value
Available Range
0 ~ 50mV Linear Voltage Input
17
0 ~ 50mV
4 ~ 20mA Linear Current Input
16
4 ~ 20mA
0 ~ 20mA Linear Current Input
15
0 ~ 20mA
0 ~ 10V Linear Voltage Input
14
0 ~ 10V
0 ~ 5V Linear Voltage Input
13
0 ~ 5V
Platinum RTD (Pt100)
12
-200 ~ 600
o
C (-328 ~ 1112
o
F)
Platinum RTD (JPt100)
11
-20 ~ 400
o
C (-4 ~ 752
o
F)
Thermocouple TXK type
10
-200 ~ 800
o
C (-328 ~ 1472
o
F)
Thermocouple U type
9
-200 ~ 500
o
C (-328 ~ 932
o
F)
Thermocouple L type
8
-200 ~ 850
o
C (-328 ~ 1562
o
F)
Thermocouple B type
7
100 ~ 1800
o
C (212 ~ 3272
o
F)
Thermocouple S type
6
0 ~ 1700
o
C (32 ~ 3092
o
F)
Thermocouple R type
5
0 ~ 1700
o
C (32 ~ 3092
o
F)
Thermocouple N type
4
-200 ~ 1300
o
C (-328 ~ 2372
o
F)
Thermocouple E type
3
0 ~ 600
o
C (32 ~ 1112
o
F)
Thermocouple T type
2
-200 ~ 400
o
C (-328 ~ 752
o
F)
Thermocouple J type
1
-100 ~ 1200
o
C (-148 ~ 2192
o
F)
Thermocouple K type
0
-200 ~ 1300
o
C (-328 ~ 2372
o
F)
Note 1: An internal precision resistor for the current input is built-in, please refer to item 12, How To Set Up Current Input.
Note 2: Factory setting: PT100 input. It is adjustable for linear input and feedback ranges. The default range of input feedbadk is -999 ~ 9,999.
For example, when a 0 ~ 20mA analog input is selected as the input temperature sensor type, -999 indicates 0mA and 9,999 indicates 20mA.
If the user changes the input range to 0 ~ 2,000, 0 indicates 0mA and 2,000 indicates 20mA. One display scale equals to 0.01mA.
6
OUTPUT FUNCTION
Output control for SCD is selective: Control output (heating, cooling), Alarm output, or Retransmission output.
Control Output:
Temperature can individually be controlled by two groups of outputs: cooling (forward) or heating (reverse). When
Dual Loop output control is used, two output controls shall be designed for cooling (forward) or heating (reverse).
If two control outputs with the same direction are performed, only the 1
st
group of control period is valid.
Control methods: PID control, ON/OFF control, Manual control, and PID program control.
Single-output Control:
Heating Hysteresis
ON
OFF
PV
Figure1: ON-OFF control of single output
Cooling Hysteresis
Heating
Cooling
Set Point
Set Point
PV
100%
0
PV
100%
0
Output
Heating
Set Point
Output
Cooling
Set Point
Figure 2: PID Control,
forward (cooling) control
Figure 3: PID Control,
reverse (heating) control