Table of Contents
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CHAPTER 4 APPLIED OPERATION
J How to calculate
the heater burn-
out set value
F Examples of use
Heater
1KW
CT
17
15
E5EK
Control output
Heater
1KWx3
CT
17
15
E5EK
Parameters
4--14
• Calculate the set value by the following formula:
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
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 ≧ 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
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, [
rent monitor" parameter.
Example 1 : when using a 200 VAC, 1 kW heater
Control output
AC200V
Example 2 : when using three 200 VAC, 1 kW heaters
Current at normal operation =
Current at burnout of one heater =
AC200V
Set value =
out
Symbol
Heater current monitor
Heater burnout
Heater burnout latch
(current value at normal operation + current value at burnout)
] is displayed in the "heater cur-
Current at normal operation =
Current at heater burnout = 0A
5+0
Set value =
= 2.5A
2
15+10
= 12.5A
2
(current at normal operation ---current at heater burn-
= 15 --- 10 = 5A (≧ 2.5A)
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
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