Autonics DPU Series - Page 32

6. Parameter Setting and Functions
34
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-|Transparent setting guide|-
(3) Constant current mode [
C-FB
]
If temperature coe󰀩cient of load (platinum, molybdenum, tungsten, etc) changes 6 to 12 times
based on room temperature, it outputs constant current which is proportion to control input not to
change output voltage for power supply variation, load resistance variation.
(4) Constant power mode [
W-FB
]
It outputs constant power which is proportion to control input even though load variation and
power supply variation. It is proper control method for a heater which resistance value variation by
carbide(SIC) heating is big.
Output characteristics is proper 50% of the curve which connects the point (A) [output voltage
100% × output current 50%] and the point (B) [output voltage 50% × output current 100%].
The current output capacity of this unit should be over two times of load capacity.
140
120
Volume resistance rate(µΩ·cm)
Temperature(
℃)
Input signal(%)
Output voltage(%)
Output current(%)
100
100
Molybdenum
Tungsten
Kanthal
60
60
20
20
40
40
80
80
0 0
0
0
10020
25
40
50
60
75
80
100
50 100 1500 2000 2500
0.7
0.6
Volume resistance rate(
Ω
Temperature(
℃)
0.5
Deterioration
0.3
0.1
0.2
0.4
0
Input signal(%)
Output voltage(%)
Output current(%)
100
60
20
40
80
0
0
8
10020
12
40
16
60
20mA
80
1500500 1000