Heater Burnout Detection; The Heater Burnout Set Value - Omron E5AK User Manual

CHAPTER 4 APPLIED OPERATION
J How to calculate
the heater burn-
out set value
F Examples of use
Heater
1KW
CT
17 15
E5AK
Control output
Heater
1KWx3
CT
17 15
E5AK
Parameters
4--14
· Calculate the set value nby the following formule:
Set value =
· Set the current value at burnout when two or more heaters are con-
nected to the CT to the value at the time that the heater having the small-
est 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 burn-
out ≧ 1 A
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 burn-
out ≧ 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 burn-
out 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, [
monitor" parameter.
Example 1 : when using a 200 VAC, 1 kW heater
Control output
Current at normal operation =
Current at heater burnout = 0A
AC200V
Set value =
Example 2 : when using three 200 VAC, 1 kW heaters
Current at normal operation =
Current at burnout of one heater =
AC200V
Set value =
(current at normal operation ---current at heater burnout
= 15 --- 10 = 5A (≧ 2.5A)
Symbol
Heater current monitor
Heater burnout
Heater burnout latch
(current value at normal operation + current value at burnout)
] is displayed in the "heater current
5+0
= 2.5A
2
15+10
= 12.5A
2
Parameter Name: Mode
: Level 1
: Level 1
: Option
2
1000
= 5A (< 10A)
200
1000
×3 = 15A (≧ 10A)
200
1000
×2 = 10A
200
Application
Heater current value monitor

Heater burnout detection

Heater burnout detection alarm latch