Detcon 10C - Manual (Page 24)

Model 10C
From the “TRIM INPUT” display the technician can use the “ENT” pushbutton to enter the function. The
display will scroll “SET 0mA”. Apply 0 mA to the 10C Controller’s 4-20mA current input. Removal of the
input current wire to the sensor is the same as applying 0mA. Once 0mA is applied, press the “ENT”
pushbutton to accept the value, the display will scroll “0mA Done”. Press the “ENT” pushbutton again, and
the display will scroll “SET 20mA”. Apply 20.0mA to the current input and press the “ENT” pushbutton.
The display will scroll “20mA Done” if the controller accepts the input. If the controller does not accept the
input, the display will scroll “20mA Failed”. The cause of the failure is that the 10C Controller did not see a
reasonable input current level for 20mA. If this happens the “TRIM INPUT” function did not make an
adjustment to the gain factor for input current. The “ESC” pushbutton must be pushed to leave the function,
and the controller will return to “TRIM INPUT”.
Move to another menu item by using the “×” and “Ø” pushbuttons, or use the “ESC” pushbutton to leave the
“TRIM INPUT” function.
NOTE: This mode does not automatically time-out and must be exited or power-cycled to
return to normal operation.
5.2 Trim Output
Trim Output Mode allows a technician to adjust the 4mA point and the 20mA point of the 10C Controller’s
current output.
NOTE: The Trim Output function is only accessible in Technician Access Mode. The 10C
Controller analog output is trimmed at the factory and under normal circumstances should not
need to be trimmed again.
NOTE: If the Default Settings function (see section 5.3) is executed the output trim values are
restored to un-trimmed values and the 10C Controller’s output will not be as accurate as if it
were trimmed.
The menu item appears as: “TRIM OUTPUT”.
From the “TRIM OUTPUT” display, the technician can use the “ENT” pushbutton to enter the function. The
display will scroll “DAC Trim Out”. Pressing the “ENT” pushbutton will cause the display to change to
“FORCE 4mA”. The mA output of the controller will change to 4mA. The “×” and “Ø” pushbuttons can be
used to make the output current go up or down in small incremental steps. By monitoring the output current,
the technician can adjust the current to exactly 4.00mA. When the output is trimmed to 4.00mA, the
technician can accept the internal trimmed value by pressing “ENT”. When “ENT” pushbutton is pressed, the
zero is trimmed and the display will change to “FORCE 20mA”. The mA output of the controller will change
to 20mA. The “×” and “Ø” pushbuttons can be used to make the output current go up or down in small
incremental steps. When the output is trimmed to 20.0mA, the technician can accept the internal trimmed
value by pressing “ENT”, and if he has pressed “×” or “Ø” at least once, the internal trimmed value will be
accepted. In response to the “ENT” pushbutton, the 10C Controller will return to the display “FORCE 4mA”
allowing multiple passes through this procedure to attain the best trimming. Usually two passes is sufficient.
The “ESC” pushbutton may be pressed at any time to leave the function, and the controller will return to
“TRIM OUTPUT”.
Move to another menu item by using the “×” and “Ø” pushbuttons, or use the “ESC” pushbutton to leave the
“TRIM OUTPUT” function.
10C Control Module Instruction Manual Rev.0.B Page 20 of 25