3-10-4 Calculating Detection Current Values; 3-10-5 Application Examples - Omron E5AZ User Manual

Using Heater Burnout Alarm (HBA)

3-10-4 Calculating Detection Current Values

3-10-5 Application Examples

Parameters
ct
hb
hbh
hbl
48
• Calculate the set value by the following equation:
(current value at normal operation + current value at heater burnout)
Set value =
• To set the current for heater burnout when two or more heaters are con-
nected through the CT, use the value from when the heater with the small-
est current burns out. If all of the heaters have the same current, use the
value from when any one of them burns out.
• Make sure that the following conditions are satisfied:
Heater with a current of less than 10.0 A:
(Current value at normal operation) − (Current value at heater burnout) ≥
1 A
When the difference is less than 1 A, detection is unstable.
Heater with a current of 10.0 A or more:
(Current value at normal operation) − (Current value at heater burnout) ≥
2.5 A
When the difference 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
1 kw
CT
E5AZ/E5EZ 15 16
Example 2
Control output
Heater
1 kw × 3
CT
E5AZ/E5EZ 15 16
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
When using a 200 VAC, 1 kW heater
Current during normal operation =
Current at heater burnout = 0 A
5 + 0
200 VAC
Set value =
2
(current at normal operation − current at heater
burnout) = 5 − 0 = 5 A (
When using three 200 VAC, 1 kW heaters
Current at normal operation =
Current at burnout of one heater =
15 + 10
200 VAC Set value =
2
(current at normal operation − current at heater
burnout) = 15−10 = 5 A (
Parameter: Level
Section 3-10
2
1000
= 5 A (< 10 A)
200
= 2.5 A
≥
1 A))
1000
× 3 = 15 A (≥ 10 A)
200
1000
× 2 = 10 A
200
= 12.5 A
≥
2.5 A))
Description
For heater current value monitor
For HBA detection
For HBA detection
For HBA detection