Omron E5CN User Manual

64
Using Heater Burnout, Heater Short, and Heater Overcurrent Alarms Section 3-10
• The setting range is 0.1 to 49.9 A. Heater burnout, HS, and heater over-
current are not detected when the set value is 0.0 or 50.0. When the set
value is 0.0, the heater burnout alarm is always OFF, the HS alarm is
always ON, and the heater overcurrent alarm is always ON. When the set
value is 50.0, the heater burnout alarm is always ON, the HS alarm is
always OFF, and the heater overcurrent alarm is always OFF.
• 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 (or 2) Value Monitor and Leakage Current 1 (or 2) Moni-
tor parameters.
3-10-4 Application Examples
Single-phase Heaters Example: Using a 200-VAC, 1-kW Heater
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:
Example: Using Three 200-VAC, 1-kW Heaters
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:
CT
0 A
200 V
CT
5 A→
←5 A
200 V
Normal
AC line
Load Load
AC line
Product
To CT in
p
ut
Product
To CT input
Burnout
Load (such as a heater)
Burnout
Heater burnout detection current =
(Normal current) + (Heater burnout current)
2
=
5 + 0
2
= 2.5 [A]
10 A
10 A
CT
15 A→
←15 A
200 V
CT
200 V
Normal
Product
To CT input
Product
To CT in
p
ut
Burnout
Load LoadLoad
Load LoadLoad
Burn-
out
Heater burnout detection current =
(Normal current) + (Heater burnout current)
2
=
15 + 10
2
= 12.5 [A]

Omron E5CN Specifications

General

Brand	Omron
Model	E5CN
Category	Temperature Controller
Language	English