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Determining the Error from the Current Situation for Heater Burnout Alarm Errors
Section 7-8
7-8
Determining the Error from the Current Situation for
Heater Burnout Alarm Errors
HB (Heater Burnout) Alarm or Heater Burnout Not Detected
Possible cause
Countermeasure
Connection No current transformer (CT) is connected.
• Connect a CT.
The CT is connected to the wrong channel.
• Connect the CT to the correct channel.
Setting
Control does not start.
• Start control.
The ON time for control output is less than 100 ms.
• Set the control output ON time to 100 ms or more.
→
This will make the HB alarm operate.
The heater power was turned ON after operation control
started.
• Turn ON the heater power then start operation control.
The heater burnout detection current is set to 0.0 or 100 A.
• Set an appropriate value between 0.1 and 99.9 A.
The heater burnout detection current is the heater rated cur-
rent.
• Measure the heater current and set the detection current
value.
The measured heater burnout detection current is not suit-
able.
• Set the detection current again, taking into consideration
the voltage range of the heater power supply and current
measurement error.
Procedure
The heater current value exceeds 100 A.
• Reduce the value to 100 A or less.
The heater current is direct current (DC).
• The HB alarm will not operate under these conditions.
A pure metal heater is used.
• Measure the heater current and set the detection current
value.
Summary of Contents for EJ1G
Page 3: ...iv ...
Page 17: ...xviii ...
Page 21: ...xxii ...
Page 53: ...32 Unit Configuration Examples Section 2 4 ...
Page 69: ...48 Changing SPs During Operation Section 3 3 ...
Page 81: ...60 Other Functions Section 4 5 ...
Page 145: ...124 Other HFU Functions Section 5 7 ...
Page 167: ...146 Detailed Description of Services Section 6 4 ...
Page 229: ...208 Parameters That Can Be Allocated for Programless Communications Appendix ...
Page 237: ......