Third Current Output Calibration; Table 6-5 Set Up Wiring Procedure For The Third Current Output; Figure 6-3 Wiring Connections For Calibrating Third Current Output - Honeywell UDC3500 Product Manual

Output Calibration

6.4 Third 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 a current output range of from 0 mA to 21 mA.
The controller is usually calibrated at 4 mA for 0 % of output and 20 mA for 100 % of
output, but it may be calibrated for 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 for Third Current Output in Sub-section 3.22 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 6-3 and wire the controller according to the procedure given in Table 6-5.

Table 6-5 Set Up Wiring Procedure for the Third Current Output

Step
Apply power and allow the controller to warm up 30 minutes before you calibrate.
1
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 7 (+)
and 9 (–). See Figure 6-3.
4 Connect a milliammeter across these terminals.

Figure 6-3 Wiring Connections for Calibrating Third Current Output

300
L1
L2/N
4
5
6
7
Curre nt
8
Output 3
9
UDC3500 Universal Digital Controller Product Manual
Action
Milliammeter
+
+
_
_
3/07