Emerson Rosemount 644 with HART Protocol, Reference Manual

Page: 83 / 112

Reference Manual
00809-0200-4728, Rev SA
Troubleshooting
July 2018
75
Troubleshooting
Section 6 Troubleshooting
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 75
Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 75
4–20 mA/HART output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 76
Diagnostic messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 77
6.1 Overview
Table 6-1 on page 76 provides summarized maintenance and troubleshooting suggestions for the most
common operating problems.
If you suspect malfunction despite the absence of any diagnostic messages on the Field Communicator
display, follow the procedures described in
Table 6-1 on page 76 to verify that transmitter hardware and
process connections are in good working order. Under each of four major symptoms, specific
suggestions are offered for solving problems. Always deal with the most likely and easiest-to-check
conditions first.
6.2 Safety messages
Procedures and instructions in this section may require special precautions to ensure the safety of the
personnel performing the operations. Information that raises potential safety issues is indicated by a
warning symbol ( ). Refer to the following safety messages before performing an operation preceded
by this symbol.
Explosions could result in death or serious injury.

Installation of this transmitter in an explosive environment must be in accordance with the
appropriate local, national, and international standards, codes, and practices. Review the approvals
section of this reference manual for any restrictions associated with a safe installation.

Before connecting a Field Communicator in an explosive atmosphere, ensure the instruments in the
loop are installed in accordance with intrinsically safe or non-incendive field wiring practices.

In an Explosion-Proof/Flameproof installation, do not remove the transmitter covers when power is
applied to the unit.
Process leaks may cause harm or result in death.
Install and tighten process connectors before applying pressure.
Electrical shock can result in death or serious injury.
Avoid contact with the leads and terminals. High voltage that may be present on leads can cause
electrical shock.