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Determining the Error from the Current Situation for Heater Burnout Alarm Errors
Section 8-8
8-8
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 HB alarm is not assigned to a control output or bus out-
put.
• Assign an HB alarm to a control output or bus output.
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 EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
Page 305: ......