Omron E5AZ User Manual

48
Using Heater Burnout Alarm (HBA) Section 3-10
3-10-4 Calculating Detection Current Values
• Calculate the set value by the following equation:
• 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.
3-10-5 Application Examples
Example 1 When using a 200 VAC, 1 kW heater
Example 2 When using three 200 VAC, 1 kW heaters
Set value =
(current value at normal operation + current value at heater burnout)
2
Current during normal operation =
Current at heater burnout = 0 A
Set value =
(current at normal operation − current at heater
burnout) = 5 − 0 = 5 A (
≥ 1 A))
Heater
Control output
1 kw
CT
200 VAC
E5AZ/E5EZ
15 16
200
1000
= 5 A (< 10 A)
2
5 + 0
= 2.5 A
Current at normal operation =
Current at burnout of one heater =
Set value =
(current at normal operation − current at heater
Heater
Control output
1 kw × 3
CT
200 VAC
E5AZ/E5EZ
15 16
burnout) = 15−10 = 5 A ( ≥ 2.5 A))
200
1000
× 3 = 15 A (≥ 10 A)
2
15 + 10
= 12.5 A
200
1000
× 2 = 10 A
Symbol Parameter: Level Description
ct Heater current value monitor: Adjustment level For heater current value monitor
hb Heater burnout detection: Adjustment level For HBA detection
hbh Heater burnout hysteresis: Advanced function setting level For HBA detection
hbl Heater burnout latch: Advanced function setting level For HBA detection
Parameters

Omron E5AZ Specifications

General

Brand	Omron
Model	E5AZ
Category	Temperature Controller
Language	English