Publication 900-UM007D-EN-E - January 2011
Configuration & Basic Operation
3-53
The heater burnout current when there is a burnout at the load is as follows:
(heater burnout detection current) = (17.3 + 10) / 2
≈
13.65 [A]
To enable detection in either case, use 16.1 A as the heater burnout detection
current.
Figure 3.102 — Heater Burnout Detection
EXAMPLE
Using Three 200V AC, 2 kW Heaters, Star Connecting Lines
The current when each phase is normal is 5.8 A (
≈
10 A
×
(1 /
√
3)).
Figure 3.103 — Star Connecting Lines
The heater burnout detection current for this connecting line is
5.4 A (= (5.8 + 5) / 2).
CT
CT
Load
Load
200 V
200 V
15 A
→
15 A
→
200 V
CT
CT
Load
Load
200 V
200 V
10 A
→
17.3 A
→
10 A
→
200 V
Burnout
Burnout
Burnout
Load
Load
To CT input
To CT input
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
Burnout
To CT Controller input
To CT Controller input
CT
CT
200 V
200 V
5.8 A
→
5.8 A
→
5.8 A
→
200 V
Load
Load
Load
Normal
To CT input
Load (such as a heater)
To CT Controller input
Summary of Contents for Allen-Bradley 900-TC16
Page 1: ...USER MANUAL Bulletin 900 TC8 900 TC16 900 TC32 Series B Temperature Controllers...
Page 2: ...2...
Page 72: ...Publication 900 UM007D EN E January 2011 3 2 Configuration Basic Operation Figure 3 3 900 TC32...
Page 136: ...Publication 900 UM007D EN E January 2011 3 66 Configuration Basic Operation Notes...
Page 340: ...Publication 900 UM007D EN E January 2011 5 112 Parameter Functions Definitions Notes...
Page 350: ...Publication 900 UM007D EN E January 2011 6 10 Troubleshooting Error Indication Notes...
Page 406: ...Publication 900 UM007D EN E January 2011 D 8 Glossary Notes...
