15-3
IM 2560A-01EN
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App
Index
Troubleshooting, Maintenance, and Inspection
4. The output value and the polarity and unit indicators on the output display blink. The output display shows the
lower or upper limit that can be sourced blinking. The output remains on, and a value within the source range is
output.
Cause
If the deviation is set to 0 (zero) and the output value determined by the main setting and RJC
value (reference junction temperature) is outside the source range
Example:
If the RJC value changes near the upper or lower limit of the user-defined source range
Correction
Change the main setting or RJC value so that the output value is within the source range.
Deviation
The deviation on the deviation display blinks. The output remains on, and the minimum or maximum value within
the source range is output.
Cause
If the output value determined by the main setting, output divider, and deviation is outside the
source range
Example:
• If the output value determined by the user-defined main setting, output divider, and deviation
is outside the source range
• If the range is 1 V, deviation preset is OFF, deviation is -6.43%, main setting (MIN) is +0 V,
and main setting (MAX) is set to +1.15006 V or higher
Correction
Operate a deviation dial. The deviation changes so that the output value is within the source
range.
Reference Junction Compensation
1. Of the RJC, EXT, and INT indicators, the one that was on is blinking. If the RJC mode is set to manual input (MAN)
and the correction value is 0.00°C, all the RJC, EXT, and INT indicators are turned off and do not blink.
Cause 1-1
If the temperature type is set to TC USER/RTD USER when the user-defined thermocouple/RTD
output is not defined
Example:
If user definitions are deleted with a communication command
* In this condition, the output cannot be turned on.
Correction
1-1
Set the temperature type to a type other than TC USER or RTD USER, or create user definitions.
Cause 1-2
If the RJC value (reference junction temperature) is outside the source range of the selected
thermocouple type
Example:
If the thermocouple type is B and the RJC value is –20°C
* Even if it goes outside the defined range of the source range of the thermocouple type, the
2560A will expand the definition up to the RJC value and output thermoelectromotive force
after applying reference junction compensation.
Correction
1-2
Set the RJC value within the source range of the selected thermocouple type. If the
thermocouple type can be changed, changing to a thermocouple type whose source range
includes the RJC value will cause the display blinking to change to solid.
Cause 1-3
If the RJC value is outside the source range of the user-defined thermocouple
Example:
When the source range of the user-defined thermocouple is ±10.0°C and the RJC value is
-20°C
* Even if it goes outside the source range of the user-defined thermocouple, the 2560A will
assume the RJC value to be 0.00°C (no reference junction compensation) and output
thermoelectromotive force after applying reference junction compensation.
Correction
1-3
Set the RJC value within the user-defined source range, or change to a user definition that
includes the RJC value.
2. The reference junction compensation setting (polarity, main setting, and unit) displays are blinking, and the
RJC indicator is also blinking. The output can be turned on. Thermoelectromotive force after applying reference
junction compensation at the specified value is output.
Cause
If the RJC mode is set to manual input (MAN) and the specified RJC value (reference junction
temperature) is outside the selectable range (-20°C to +60°C)
Example:
When the RJC value is changed from +60°C to -60°C (polarity change)
Correction
Operate main setting dials 1 to 4. The main setting will change to the maximum setting of the
appropriate polarity side or an RJC value within the selectable range. If changing the polarity
would cause the value to be in the selectable range and you change the polarity, blinking
changes to solid. However, if cause 1-2 or 1-3 persists, blinking of the RJC indicator will
continue.
15.2 Error Indication