3-10-4 How To Calculate Detection Current Values; 3-10-5 Example - Omron E5CN User Manual

Heater Burnout Alarm (HBA)

3-10-4 How to calculate detection current values

3-10-5 Example

Parameters
/@
4.
4.4
4.8
• Calculate the set value by the following equation:
(current value at normal operation + current value at heater burnout)
Set value =
• To set the value of the heater burnout when two or more heaters are con-
nected through the CT, use the curent value of the smallest heater con-
nected. OR the current value when one of the heaters burns out if all the
heaters have the same current value.
• Make sure that the following conditions are satisfied:
Heater of current 10.0 A or less:
Current value at normal operation -
(When the resultant current is less than 1 A, detection is unstable.)
Heater of current 10.0 A or more:
Current value at normal operation -
(When the 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 set value is "0.0" or "50.0". When the set value is "0.0", the heater
burnout alarm is set to "OFF", and if the set value 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", "ffff" is displayed in the "heater current monitor"
parameter.
Example 1
Control output
Heater
1KW
CT
14 15
E5CN
Example 2
Control output
Heater
1KWx3
CT
E5CN 14 15
Symbol
Heater current value monitor: Adjustment level
Heater burnout detection: Adjustment level
Heater burnout hysteresis: Advanced function setting level
Heater burnout latch: Advanced function setting level
current value at heater burnout ≥ 1 A
current value at heater burnout ≥ 2.5 A
When using a 200 VAC, 1 kW heater
Current during normal operation =
Current at heater burnout = 0A
5 + 0
AC200V
Set value =
(current at normal operation - current at heater
burnout ) = 5−0 = 5A (
When using three 200 VAC, 1 kW heaters
Current at normal operation =
Current at burnout of one heater =
5 + 10
AC200V Set value =
(current at normal operation - current at heater
burnout ) = 15−10 = 5A (
Parameter : Level
Section 3-10
2
1000
= 5A (< 10A)
200
= 2.5A
200
≥
1A))
1000
× 3 = 15A (≥ 10A)
200
1000
× 2 = 10A
200
= 12.5A
2
≥
2.5A))
Description
For heater current value monitor
For HBA detection
For HBA detection
For HBA detection
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