Omron E5CC - Page 191

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4 Basic Operation
E5@C Digital Temperature Controllers User’s Manual (H174)
4-12 Using Heater Burnout (HB) and Heater Short (HS) Alarms (Not
Supported for Position-proportional Models.)
4
4-12-5 Application Examples
(c) V Connecting Lines
Example: Using Two 200-VAC, 2-kW Heaters
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.
Normal
Normal Burnout
Current when there is a burnout =
10 A × (1/2) = 5 A
Current when there is a burnout = 0 A
CT
CT
Load
Load
10 A
17.3 A
10 A
200 V
200 V
200 V
Product
To CT input
Product
To CT input
CT
CT
Load
Load
5 A
5 A
200 V
200 V
200 V
Product
To CT input
Product
To CT input
Burnout
CT
CT
Load
Load
10 A
10 A
200 V
200 V
200 V
Product
To CT input
Product
To CT input
Burnou
t