Omron EJ1 User Manual

93
Detecting Current Errors Section 4-5
c. V Connection
Example: Using Two 200-VAC, 2-kW Heaters
The heater burnout current when there is a burnout at the common is as fol-
lows:
Heater burnout detection current =
≅ 7.5 [A]
The heater burnout current when there is a burnout at the load is as follows:
Heater burnout detection current =
≅ 5 [A]
To enable detection in either case, use 7.5 A as the heater burnout detection
current.
4-5-3 Heater Short Alarm (HS Alarm)
The HS Alarm detection function measures the heater current when the con-
trol output (heating) is OFF. For details, refer to the following table.
(HS Alarm detection cannot be used with the control output for cooling.)
Normal Operation
To CT input
Load
Load
To CT input
CT
CT
200 V
200 V
17.3 A
10 A
200 V
10 A
Load: Heater (example)
Heater Burnout Occurred
To CT input
Load
Load
To CT input To CT input
To CT input
CT
CT
200 V
200 V
200 V
5 A
5 A
Burnout
Load
Load
CT
CT
200 V
200 V
10 A
200 V
10 A
Burnout
Load: Heater
(example)
Load: Heater
(example)
Current when there is a burnout = 10 A ×
= 5 A
1
2
---
Current when there is a burnout = 0 A
10 5+
2
----------------
10 0+
2
----------------
Control output (heating) Power to heater HS Alarm output
OFF Yes (HS alarm occurred) ON
No (Normal) (See note 1.) OFF

Omron EJ1 Specifications

General

Brand	Omron
Model	EJ1
Category	Temperature Controller
Language	English