Emerson Rosemount 644, Reference Manual

Page: 87 / 182

Reference Manual
00809-0200-4728, Rev RA
Section 6: Troubleshooting
April 2015
77
Troubleshooting
Section 6 Troubleshooting
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 77
Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 77
Troubleshooting the 4-20 mA/HART output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 78
Diagnostic messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 80
6.1 Overview
Table 6-1 on page 78 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 78 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.