Omron E5EZ User Manual

52
Using HB and HS Alarms Section 3-10
• The setting range is 0.1 to 49.9 A. Heater burnout and HS 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, and
the HS alarm is always ON.
When the set value is 50.0, the heater burnout alarm is always ON, and
the HS 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 value monitor” and “leakage current 1 monitor” parame-
ters.
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 E5EZ Specifications

General

Brand	Omron
Model	E5EZ
Category	Temperature Controller
Language	English