Omron E5EK User Manual

CHAPTER 4 APPLIED OPERATIO N
E5EK
4--14
• Calculate the set value by the following formula:
Set value =
(current value at normal operation + current value at burnout)
2
• Setthecurrentvalueatburnoutwhentwoor moreheatersarecon-
nected to the CT to the value at the time that the heater having the
smallest current value burns out (the value when one of the heaters
burns out with all heaters at the same current).
• Make sure that the following condition is satisfied:
Heater of current 10.0 A or less
Current value at normal operation --- current value at heater
burnout ≧ 1A
When resultant current is less than 1 A, detection is unstable.
Heater of current 10.0 A or more
Current value at normal operation --- current value at heater
burnout ≧ 2.5 A
When resultant current is less than 2.5 A, detection is unstable.
• The setting range is 0.1 to 49.9 A. Heater burnout is not detected
when the setting is “0.0” or “50.0”. When the setting is “0.0”, the
heater burnout alarm is set to “OFF”, and when the setting is “50.0”,
the heater burnout alarm is set to “ON”.
• Set the total current value at normal heater operation to 50 A or less.
When set to 55.0 A or more, [
] is displayed in the “heater cur-
rent monitor” parameter.
Example 1 : when using a 200 VAC, 1 kW heater
Current at normal operation =
1000
200
= 5A (<10A)
Current at heater burnout = 0A
Set value =
5+0
2
=2.5A
Example 2 : when using three 200 VAC, 1 kW heaters
Set value =
Current at normal operation =
1000
200
×3 = 15A (≧ 10A)
Current at burnout of one heater =
1000
200
×2 = 10A
15+10
2
= 12.5A
(current at no rmal operation---current at heater burn-
out = 15 --- 10 = 5A (≧ 2.5A)
Symbol Parameter Name: Mode Application
Heater current monitor : Level 1 Heater current value monitor
Heater burnout : Level 1 Heater burnout detection
Heater burnout latch : Option Heater burnout detection alarm latch
JHow to calculate
the heater burn-
out set value
F Examples of use
15
Control output
17
Heater
1KW
AC200V
CT
E5EK
15
Control output
17
Heater
1KWx3
AC200V
CT
E5EK
Parameters

Omron E5EK Specifications

General

Brand	Omron
Model	E5EK
Category	Controller
Language	English