Honeywell SMV 3000 user manual Running Output Check, Background Analog Output Mode Procedure

7.3Running Output Check

Background

ATTENTION

Analog Output Mode Procedure

An SMV transmitter operating in the analog mode can be put into a constant-current source mode (called the output mode) to checkout other instruments in the control loop such as recorders, controllers, and positioners. Using the SCT, you can tell the transmitter to change its output to any value between 0 percent (4mA or 1V) and 100 percent (20mA or 5V) and maintain that output. This makes it easy to verify loop operation through the accurate simulation of transmitter output signals before bringing the loop on-line.

For SMV transmitters operating the DE mode, you can simulate an output for each PV individually to verify output at the digital receiver or DCS. Follow the steps in Table 20 for transmitters in DE mode.

The transmitter does not measure the given PV input or update the PV output while it is in the output mode.

IMPORTANT: Before performing this procedure, you must check the calibration of the transmitter’s D/A converter. Perform the procedure “The Steps to Calibrate for PV4 Output,” found in the Calibration section of the SCT on-line user manual.

The procedure in Table 19 outlines the steps for checking the PV output for SMV transmitter operating in analog mode.

Table 19 Analog Output Check Procedure

Step Action

1Connect SCT to SMV and establish communications. (See Subsection 5.2 for procedure, if necessary.)

2Be sure any switches that may trip alarms or interlocks associated with analog loops are secured or turned off.

3

Perform Upload of the SMV database to the SCT.

4

Select General tab card and set communication mode to Analog.

Continued on next page

1/99 SMV 3000 Transmitter User’s Manual 81