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Output Calibration
152 UDC2500 Universal Digital Controller Product Manual 4/07
6.2 Current Output Calibration
Introduction
Calibrate the controller so that the output provides the proper amount of current over the
desired range. The controller can provide an output current range of from 0 to 21
milliamperes and is usually calibrated at 4 mA for 0 % of output and 20 mA for 100 % of
output, or any other values between 0 mA and 21 mA. It is not necessary to re-calibrate
the controller in order to change from 4 to 20 mA operation over to 0 to 20 mA operation,
a simple configuration change is all that is required. See the CO RANGE configuration
in Sub-section 3.8 for details.
Equipment Needed
You will need a standard shop type milliammeter, with whatever accuracy is required,
capable of measuring 0 to 20 milliamps.
Calibrator Connections
Refer to Figure 6-1 and wire the controller according to the procedure given in Table 6-1.
Table 6-1 Set Up Wiring Procedure for Current Output
Step Action
1
Apply power and allow the controller to warm up 30 minutes before you calibrate.
2
Set LOCK in the Tuning Set Up group to NONE.
3
Tag and disconnect the field wiring, at the rear of the controller, from terminals
21 (–) and 19 (+). See
Figure 6-1.
4
Connect a milliammeter across these terminals.
Milliammeter
+
_
+
_
19+
20
21-
Milliammeter
+
_
+
_
19+
20
21-
Figure 6-1 Wiring Connections for Calibrating Current Output