Instruction manual

Instruction Manual

D103605X012

Wiring Practices

January 2015

Section 2 Wiring Practices22

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 2‐1). 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.

Figure 2‐1. HART Filter Application

DIGITAL VALVE

CONTROLLER

4‐20 mA + HART

VALVE

Tx Tx

I/O I/O

HART

FILTER

NON‐HART BASED DCS

A6188‐1

Voltage Available

The voltage available at the DVC6200 digital valve controller must be at least 10 VDC. The voltage available at the

instrument is not the actual voltage measured at the instrument when the instrument is connected. The voltage

measured at the instrument is limited by the instrument and is typically less than the voltage available.