Emerson 4500 manual Recall Factory Trim- Analog Output, Analog Output Trim Digital-to-Analog Trim

Rosemount 4500

Reference Manual

00809-0100-4027, Rev AA December 2005

Recall Factory Trim— Analog Output

Fast Keys 1, 2, 3, 4, 2

Analog Output Trim

Digital-to-Analog Trim

Fast Keys 1, 2, 3, 2, 1

This command resets the transmitter analog output trim to the “as shipped” factory settings. The Recall Factory Trim—Analog Output command can be useful for recovering from an inadvertent trim, incorrect Plant Standard or faulty meter.

AMS

Right click on the device and select “Calibrate,” then “Recall Factory Trim” from the menu.

1.Click Next after setting the control loop to manual.

2.Select “Analog output trim” under “Trim to recall” and click Next.

3.Click Next to acknowledge restoration of trim values is complete.

4.Select Next to acknowledge the loop can be returned to automatic control.

5.Select Finish to acknowledge the method is complete.

The Analog Output Trim commands allow you to adjust the transmitter’s current output at the 4 and 20 mA points to match the plant standards. This command adjusts the digital to analog signal conversion (see Figure 4-1 on page 4-3).

HART Communicator

To perform a digital-to-analog trim with a HART Communicator, perform the following procedure.

1.From the HOME screen, enter the fast key sequence for “Digital-to-Analog Trim.” Select OK after setting the control loop to manual, see “Setting the Loop to Manual” on page 3-2.

2.Connect an accurate reference ammeter to the transmitter at the CONNECT REFERENCE METER prompt. Connect the positive lead to the positive terminal and the negative lead to the test terminal in the transmitter terminal compartment, or shunt power through the reference meter at some point.

3.Select OK after connecting the reference meter.

4.Select OK at the SETTING FLD DEV OUTPUT TO 4 MA prompt. The transmitter outputs 4.0 mA.

5.Record the actual value from the reference meter, and enter it at the ENTER METER VALUE prompt. The HART Communicator prompts you to verify whether or not the output value equals the value on the reference meter.

6.Select 1: Yes, if the reference meter value equals the transmitter output

value, or 2: No if it does not.

a.If 1 is selected: Yes, proceed to Step 7.

b.If 2 is selected: No, repeat Step 5.

7.Select OK at the SETTING FLD DEV OUTPUT TO 20 MA prompt, and repeat Steps 5 and 6 until the reference meter value equals the transmitter output value.

8.Select OK after the control loop is returned to automatic control.

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