南宫莫尘Transmitter Module has no current output
If the LED on the Transmitter Module is not lit
- Loose or shorted signal connection (fix connection)
- Controller Board not responding (Replace Transmitter Module)
If the LED on the Circuit Board is lit
- Potentiometer is disengaged from shaft (must be returned for repair) - Defective controller board (Replace Transmitter Module)
Transmitter does not output 4 or 20mA (+/-1%) Unit not calibrated (calibrate)
at desired end of travel Unit is calibrated (recalibrate - if still fails, replace board) Output is not linear or does not track valve position or rotation Error Code 4-3 Error Code 4-4 Error Code 4-5 Error Code 4-6 Error Code 4-7 Error Code 4-1
Input signal is not linear
- Linkage or drive mechanism is introducing non-linearity - Unit is not calibrated (calibrate) Start position is too low or in the dead-band position. Start Position is too high
Start and stop positions are less than 20º, increase valve rotation between start and stop positions to greater than 20º. Rotation has exceeded the 320º limit. Decrease valve rotation between start and stop positions to less than 320º. Calibration rotation was in the wrong direction or the potentiometer passed through the dead-band position.
Internal Error has occurred. Recalibrate, if error continues, replace module.
Operation of the 4-20mA Current Position Transmitter
During run mode, the 4-20mA position transmitter will output 4-20mA for valve positions between and including the set points. The module has an optional over or under travel correction if the valve position exceeds the high or low set point by +/-3%. In other words, the output will be 4mA for +/-3% over and under travel on the low end and 20mA for +/-3% over and under travel on the high end. If the valve position exceeds 3% of over travel then values below 4mA or above 20mA will be output. The user selectable other option is to calibrate the device without the over and under travel capability. See the calibration procedure in this document for additional information.
Operation of the Stand Alone Potentiometer
The potentiometer only version will generate a ratio metric voltage output based on the excitation voltage and the position of the valve. Standard potentiometer options include 0-1k ohm and 0-10k ohm.
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