5-89
Chapter 5. Functions
5 - 12 Current Transformer (CT) Input
There are two types of current values input from the CT input terminals.
• Current when output ON: Used for heater burnout/overcurrent events. It can be displayed as CT current.
• Current when output OFF: Used for heater short-circuit events. It cannot be displayed.
If C36 or C39 (CT operation type) is set to 0 (heater burnout detection):
Current when output ON: The CT current measured when the output specified by “CT output” is ON
Current when output OFF: The CT current measured when the output specified by “CT output” is OFF
If C36 or C39 (CT operation type) is set to 1 (current measurement):
Current when output ON: The CT current measured regardless of whether the output is ON or OFF
Current when output OFF: Always 0.0 A
The following is a functional block diagram for CT input.
CT operation type
(Setup bank: C36, C39)
Output status (ON/OFF) monitoring
(Setup bank: C37, C40)
Waiting for measurement
(Setup bank: C38, C41)
Current when output ON
Current when output OFF = 0 A
Current when output ON Current when output OFF
Output is ON
Heater burnout detection Current measurement
Output is OFF
Handling Precautions
• The current when the output is ON is used if the operation type of the internal
event is set to heater burnout/overcurrent.
The current when the output is OFF is used if the operation type of the internal
event is set to heater short.
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