Moore FDY - Output Trimming and Loop Test; Output Trimming Procedure; Loop Test Functionality

FDY
14 The Interface Solution Experts
PC-Programmable Frequency
Transmitter and Display
Output Trimming
Output Trimming increases the accuracy of your
transmitter by matching the reading of its recorded
output to its actual output. Essentially, this means that
it will eliminate any error in the unit that is reading the
FDY’s output.
To start trimming the output, hook-up the transmitter
in the loop shown in Figure 6, and connect either a
multimeter (preferably), or the unit that will be reading
the FDY’s signal to the transmitter’s output.
1. Click the Fix Current Low button. This should cause
the FDY to output 4mA. If it is outputting a different
value, enter the value that the FDY is outputting (in
mA) into the Output Current box, then click Trim Low.
2. Check what your multimeter displays as the
transmitters output. If it is still not precisely 4mA, enter
it into the Output Current box again and clickTrim
Low again. Repeat until your multimeter displays an
acceptable reading.
3. When you are fi nished, click Un-Fix Current. After
doing this, the output will still be trimmed, but the
output will no longer be fi xed at 4mA.
4. Continue by clicking the Fix Current High button.
This should cause the FDY to output 20mA. If the
output is a different value, enter it into the Output
Current box, then click Trim High.
5. Check what your multimeter displays as the
transmitters output. If it is still not precisely 20mA,
enter it into the Output Current again and click Trim
High again. Repeat until your multimeter displays an
acceptable reading.
6. When you are fi nished, click Un-Fix Current. After
doing this, the output will still be trimmed, but the
output will no longer be fi xed at 20mA.
NOTE:
Clicking the RESET button will completely undo output
trimming.
Loop Test
Use the Loop Test to trim other instruments in the loop.
1. To begin the loop test, enter the mA value you want
the FDY to output to the Loop into the Loop Test text
box. Click Fix.
2. Monitor the effect of this on the other instruments in
the loop, and adjust accordingly.
3. If necessary, repeat steps 1 and 2 and enter a
different value in the Output Current box.
4. When you are fi nished, click Unfi x.
After the trimming parameters have been selected,
you can continue on by either downloading the
confi guration or clicking the Custom Curve tab, and
proceeding to the Programming the Custom Curve
Parameters section.