Honeywell UDC2500 manual Current Output Calibration, Calibrator Connections, 19+

Output Calibration

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-section3.8 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 6-1and wire the controller according to the procedure given in Table 6-1.

Table 6-1 Set Up Wiring Procedure for Current Output

Step Action

1Apply power and allow the controller to warm up 30 minutes before you calibrate.

2Set LOCK in the Tuning Set Up group to NONE.

3Tag and disconnect the field wiring, at the rear of the controller, from terminals 21 (–) and 19 (+). See Figure 6-1.

4Connect a milliammeter across these terminals.

Milliammeter

+ _

+	19+
_	20
	21-

Figure 6-1 Wiring Connections for Calibrating Current Output

152 UDC2500 Universal Digital Controller Product Manual 4/07