Omron E5C User Manual page 146

4 Basic Operation
(c) V Connecting Lines
4 - 48
Example: Using Two 200-VAC, 2-kW Heaters
Normal
10 A
Product
200 V
To CT input
17.3 A
200 V
200 V
10 A
Product
To CT input
Normal
5 A
Product
200 V
To CT input
Burnout
200 V
200 V
5 A
Product
To CT input
Current when there is a burnout =
10 A × (1/2) = 5 A
The heater burnout current when there is a burnout at the common is as follows:
Heater burnout detection current = (10 + 5) / 2 = 7.5 [A]
The heater burnout current when there is a burnout at the load is as follows:
Heater burnout detection current = (10 + 0) / 2 = 5 [A]
To enable detection in either case, use 7.5 A as the heater burnout detection current.
CT
CT
Burnout
CT
200 V
200 V
200 V
CT
Current when there is a burnout = 0 A
E5@C Digital Temperature Controllers User's Manual (H174)
10 A
CT
Product
To CT input
10 A
CT
Burnout
Product
To CT input