Emerson 4500 manual Commissioning on the Bench with Hart, Setting the Loop to Manual

Rosemount 4500

Reference Manual

00809-0100-4027, Rev AA December 2005

COMMISSIONING ON THE BENCH WITH HART

Setting the Loop to Manual

Commissioning consists of testing the transmitter and verifying transmitter configuration data. 4500 transmitters can be commissioned either before or after installation. Commissioning the transmitter on the bench before installation using a 375 Field Communicator or AMS ensures that all transmitter components are in working order.

To commission on the bench, connect the transmitter and the HART Communicator or AMS as shown in Figure 3-1.Make sure the instruments in the loop are installed according to intrinsically-safe or nonincendive field wiring practices before connecting in an explosive atmosphere. Connect HART Communicator leads at any termination point in the signal loop.

For 4–20 mA transmitters, the power supply must provide 11.25 to 30 V dc at the transmitter. To enable communication, a resistance of at least 250 ohms must be present between the HART Communicator loop connection and the power supply. Do not use inductive transient protectors with the 4500.

When using a HART Communicator, any configuration changes made must be sent to the transmitter by using the “Send” key (F2). AMS configuration changes are implemented when the “Apply” button is clicked.

For more information on the 375 Field Communicator see document

00809-0100-4276. AMS help can be found in the AMS on-line guides within the AMS system.

Whenever sending or requesting data that would disrupt the loop or change the output of the transmitter, set the process application loop to manual. The HART Communicator or AMS will prompt you to set the loop to manual when necessary. Acknowledging this prompt does not set the loop to manual. The prompt is only a reminder; set the loop to manual as a separate operation.

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