Honeywell UDC2500 - 7.2 Troubleshooting Aids

Input Calibration
4/07 UDC2500 Universal Digital Controller Product Manual 145
Step Operation Press Result
3
Calibrate 100 %
FunctionFunctionFunction
You will see:
Upper Display = APLY ( 2 )
Lower Display = IN1SPN (10003)
• Adjust your calibration device to an output signal equal
to the 100 % range value for your particular input
sensor. See
Table 5-1 for Voltage, Degrees, or
Resistance equivalents for 100 % range values.
• Wait 15 seconds, and
If … Then …
you are calibrating a Thermocouple input go to step 4
you are calibrating other than a go to step 5
Thermocouple input
4
Check the Cold
Junction
Temperature
FunctionFunctionFunction
The calculations for zero and span are now stored and you
will see:
Upper Display = The cold junction temperature at the rear
terminals
Lower Display = CJTEMP (10004)
The value in the upper display is in tenths of a degree. It is
the current reading of the temperature as measured at the
thermocouple terminals and recognized by the controller.
You can change this value, if it is in error, using the
or keys.
WARNING: The accuracy of the controller is directly
affected by the accuracy of this value. It is recommended
that this value not be changed under normal circumstances.
5
Exit the
Calibration Mode
FunctionFunctionFunction
then
The controller stores the calibration constants and exits the
calibration mode.
Lower
Display
Lower
Display
Lower
Display