Omron E5EK - MANUAL 2 User Manual page 55

CHAPTER 4 APPLIED OPERATION
+ How to calculate
the heater burn-
out set value
' Examples of use
Heater
1KW
CT
17
E5EK-DRT
Heater
1KWx3
CT
17
E5EK-DRT
Parameters
4–10
Calculate the set value by 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 y 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 y 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
200VAC
15
Example 2 : when using three 200 VAC, 1 kW heaters
Control output
Current at normal operation =
Current at burnout of one heater =
200VAC
Set value =
15
Symbol
Heater current monitor
Heater burnout
Heater burnout latch
(current value at normal operation + current value at burnout)
] is displayed in the heater current
Current at normal operation =
Current at heater burnout = 0A
5+0
Set value = = 2.5A
2
(current at normal operation current at heater burnout
= 5 − 0 = 5A (y 1A)
15+10
= 12.5A
2
(current at normal operation current at heater burnout
= 15 − 10 = 5A (y 2.5A)
Parameter Name: Mode
: Level 1
: Level 1
: Option
2
1000
= 5A (<10A)
200
1000
3 = 15A (y 10A)
200
1000
2 = 10A
200
Application
Heater current value monitor
Heater burnout detection
Heater burnout detection alarm latch