United Security Products AVD-45c Manuál stáhnout pdf (Strana 256)

242 UDC 6300 Process Controller Product Manual 1/03

7.2 Current Proportional 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 can be calibrated at 4 mA for 0% of output and 20 mA

for 100% of output or any other values between 0 and 21 mA.

We recommend that the expected output load be connected for optimum

accuracy.

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 7-1 and wire the controller according to the procedure

given in Table 7-1.

Table 7-1 Set Up Wiring Procedure Current Proportional Output

Step Action

Tag and disconnect the field wiring, at the rear of the controller, from

terminals 20(+) and 21(–). See Figure 7-1.

Connect a Milliammeter across these terminals.

Connect a load resistor, equivalent to the process load, in series with

the milliammeter. See Figure 7-1.

Apply power and allow the controller to warm up 15 minutes before

you calibrate.

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United Security Products AVD-45c Manuál Strana 256