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97
Detecting Current Errors
Section 4-5
b.
Star Connection
Example: Using Three 200-VAC, 2-kW Heaters
When each phase's current is normal, the current is: 5.8 A
≅
10 A
×
.
With this configuration, the heater burnout detection current is as follows:
Heater burnout detection current =
= 5.4 [A]
Normal Operation
CT
To CT input
To CT input
Load
Load
Load
5.8 A
200 V
200 V
5.8 A
5.8 A
200 V
CT
Load: Heater (example)
1
3
-------
Heater Burnout Occurred
CT
To CT input
To CT input
Load
Load
Load
200 V
200 V
5 A
200 V
5 A
Burnout
CT
To CT input
To CT input
Load
Load
Load
200 V
200 V
5 A
200 V
5 A
Burnout
CT
CT
Load: Heater
(example)
Load: Heater
(example)
Current when there is a burnout
= 10 A
×
×
= 5 A
1
3
-------
3
2
-------
Current when there is a burnout
= 10 A
×
×
= 5 A
1
3
-------
3
2
-------
5.8
5
+
2
------------------
Summary of Contents for EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
Page 305: ......