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4 Basic Operation
4 - 46
E5@C Digital Temperature Controllers User’s Manual (H174)
Example: Using Three 200-VAC, 1-kW Heaters
The heater power supply provides 15 A when the current is normal, and 10 A when there is
a burnout, so the heater burnout detection current is calculated as follows:
(2) Three-phase Heaters
(a) Delta Connecting Lines
Example: Using Three 200-VAC, 2-kW Heaters
The current when each phase is normal is 17.3 A (
≈
√
3
×
10 A).
The heater burnout current when there is a burnout at the load line is as follows:
(Heater burnout detection current) = (17.3 + 15) / 2
=
16.15 [A]
Normal
Burnout
Normal
Normal
Burnout
Current when there is a burnout =
10 A
×
√
3
×
(
√
3/2) = 15 A
Current when there is a burnout =
10 A
×
√
3
×
(1/
√
3) = 10 A
CT
15 A
15 A
Load
200 V
Load
Load
Product
To CT input
CT
10 A
10 A
Load
200 V
Load
Load
Product
To CT input
Burnout
Heater burnout detection current =
(Normal current) + (Heater burnout current)
2
=
15 + 10
2
= 12.5 [A]
CT
CT
Load
Load
Load
17.3 A
17.3 A
17.3 A
200 V
200 V
200 V
Product
To CT input
Product
To CT input
CT
CT
Load
Load
Load
15 A
15 A
200 V
200 V
200 V
Burnout
Product
To CT input
Product
To CT input
CT
CT
Load
Load
Load
15 A
15 A
200 V
200 V
200 V
Burnout
Product
To CT input
Product
To CT input
Содержание E5C series
Страница 2: ......
Страница 18: ...Conventions Used in This Manual 16 E5 C Digital Temperature Controllers User s Manual H174 ...
Страница 34: ...1 Introduction 1 10 E5 C Digital Temperature Controllers User s Manual H174 ...
Страница 98: ...3 Part Names and Basic Procedures 3 20 E5 C Digital Temperature Controllers User s Manual H174 ...
Страница 310: ...6 Parameters 6 94 E5 C Digital Temperature Controllers User s Manual H174 ...
Страница 326: ...7 User Calibration 7 16 E5 C Digital Temperature Controllers User s Manual H174 ...
Страница 364: ...A Appendices A 38 E5 C Digital Temperature Controllers User s Manual H174 ...
Страница 365: ...Index 1 E5 C Digital Temperature Controllers User s Manual H174 I Index ...
Страница 370: ...Index 6 E5 C Digital Temperature Controllers User s Manual H174 ...