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Reference Manual
00809-0100-4027, Rev AA
December 2005
Rosemount 4500
4-8
Recall Factory Trim—
Analog Output
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.
Analog Output Trim 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).
Digital-to-Analog Trim 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.
Fast Keys
1, 2, 3, 4, 2
Fast Keys
1, 2, 3, 2, 1