United Security Products AVD-45c Manual Pagina 258

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244 UDC 6300 Process Controller Product Manual 1/03
7.2 Current Proportional Output Calibration, Continued
Procedure
The procedure for calibrating the Current Proportional Output is listed in
Table 7-2. Make sure “LOCKOUT” in the Tuning Set Up group is set to
“NONE.” See Section 3 – Configuration.
Table 7-2 Current Proportional Output Calibration Procedure
Step Description Press Action
1
Enter Calibration Mode
SET
UP
until you see
CURRENT
Lower Display
CALIB
Upper Display
2
Calibrate 0%
FUNC
L1/L2
You will see:
Lower Display
Upper Displa
y
ZERO VAL
(Value)
or
until the desired 0% output (normally 4mA) is read
on the milliammeter. Use the values shown below
depending on the action of your controller.
*
When attempting to achieve 0 mA, always adjust the
output to about 0.5 mA, and slowly decrease until the
output just goes to zero. Further decrementing will not
change the output current (since the circuit cannot produce
negative current) but will affect the accuracy of the output
by creating a dead zone where no current flows.
3
Calibrate 100%
FUNC
L1/L2
This stores the 0%value and,
You will see:
Lower Display
Upper Displa
y
SPAN VAL
(Value)
or
until the desired 100% output (normally 20mA) is
read on the milliammeter. Use the values shown
below depending on the action of your controller.
4
Exit the Calibration
Mode
FUNC
L1/L2
The controller will store the span value.
or
LOWR
DISP
To exit the calibration mode.
ATTENTION
Press the [FUNC/L1-L2] key first to
store constants.
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