Wiring Practices; Control System Requirements; Hart Filter - Fisher FIELDVUE DVC6200 Instruction Manual

Wire the digital valve controller as follows, refer to
figure 2-8:
1. Remove the wiring terminal box cap (refer to
figure 2-6).
2. Bring the field wiring into the terminal box. When
applicable, install conduit using local and national
electrical codes which apply to the application.
3. Connect the control system output card positive
wire ''current output'' to the LOOP + screw terminal in
the terminal box. Connect the control system output
card negative (or return) wire to the LOOP − screw
terminal in the terminal box.
WARNING
Personal injury or property damage,
caused by fire or explosion, can result
from the discharge of static
electricity. Connect a 14 AWG (2.08
2
mm ) ground strap between the
digital valve controller and earth
ground when flammable or hazardous
gases are present. Refer to national
and local codes and standards for
grounding requirements.
4. As shown in figure 2-8, two ground terminals are
available for connecting a safety ground, earth ground,
or drain wire. The safety ground is electrically identical
to the earth ground. Make connections to these
terminals following national and local codes and plant
standards.
WARNING
To avoid static discharge from the
plastic cover, do not rub or clean the
cover with solvents. Clean with a mild
detergent and water only.
5. Replace and hand tighten the terminal box cap. To
secure the terminal box cap engage the lock screw.
When the loop is ready for startup, apply power to the
control system output card.
September 2010
NON-HART BASED DCS
I/O I/O
HART
FILTER
Tx Tx
A6188-1/IL
Figure 2-9. HART Filter Application

Wiring Practices

Control System Requirements

There are several parameters that should be checked
to ensure the control system is compatible with the
DVC6200 digital valve controller.

HART Filter

Depending on the control system you are using, a
HART filter may be needed to allow HART
communication. The HART filter is a passive device
that is inserted in field wiring from the HART loop. The
filter is normally installed near the field wiring terminals
of the control system I/O (see figure 2-9). Its purpose
is to effectively isolate the control system output from
modulated HART communication signals and raise the
impedance of the control system to allow HART
communication. For more information on the
description and use of the HART filter, refer to the
appropriate HART filter instruction manual.
To determine if your system requires a filter contact
your Emerson Process Management sales office.
Note
A HART filter is typically NOT required
for any of the Emerson Process
Management control systems,
including PROVOXt, RS3t, and
DeltaVt systems.
Installation
4-20 mA + HART
DIGITAL VALVE
CONTROLLER
VALVE
19
2