Application Examples - Omron E5CN User Manual

Using HBA and HS Alarms

3-10-4 Application Examples

Single-phase Heaters
Normal
5 A
200 V
5 A
Product
To CT input
Normal
15 A
200 V
15 A
Product
To CT input
• Set the total current value for normal heater operation to 50 A or less.
When a current value of 55.0 A is exceeded, ffff is displayed in the
"heater current 1 (and 2) value monitor" and "leakage current 1 (and 2)
monitor" parameters.
Example: Using a 200-VAC, 1-kW Heater
AC line
Load
CT
The heater power supply provides 5 A when the current is normal, and 0 A
when there is a burnout, so the heater burnout detection current is calculated
as follows:
Heater burnout detection current =
5 + 0
= = 2.5 [A]
2
Example: Using Three 200-VAC, 1-kW Heaters
Load Load Load
CT
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:
Heater burnout detection current =
15 + 10
= = 12.5 [A]
2
Burnout
AC line
200 V
Burnout
0 A
CT
Product
To CT input
(Normal current) + (Heater burnout current)
Burnout
10 A
200 V
10 A
Product
To CT input
(Normal current) + (Heater burnout current)
Section 3-10
Load
Load (such as a heater)
2
Load Load Load
Burn-
out
CT
2
57