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Output Calibration
154 UDC2500 Universal Digital Controller Product Manual 4/07
6.3 Auxiliary Output Calibration
Introduction
Calibrate the controller so that the auxiliary output provides the proper amount of current
over the desired range. The controller can provide an auxiliary current output range of
from 0 mA to 21 mA 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 AO RANGE
configuration in Sub-section 3.12 for details.
Equipment Needed
You will need a calibrating device with whatever accuracy is required, capable of
measuring 0 to 20 mA.
Calibrator Connections
Refer to Figure 6-2 and wire the controller according to the procedure given in Table 6-3.
Table 6-3 Set Up Wiring Procedure for Auxiliary 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 12 (+)
and 13 (–). See
Figure 6-2.
4
Connect a milliammeter across these terminals.
12
13
Milliammeter
+
_
+
_
12
13
Milliammeter
+
_
+
_
Figure 6-2 Wiring Connections for Calibrating Auxiliary Output