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Instruction Manual
D102796X012
Fisher
™
HF340 Filter
This instruction manual includes installation and maintenance information for the HF340 HART ® filter
(see figure 1). Refer to separate manuals for additional
information on other products used with the HART filters, such as FIELDVUE ™ DVC6200, DVC6000, or
DVC2000 digital valve controllers.
Control system refers to a distributed control system
(DCS), programmable logic controller (PLC), or a stand‐alone controller that provides a control signal to the FIELDVUE instrument.
Do not install, operate, or maintain an HF340 filter without being fully trained and qualified in valve, actuator, and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to carefully read, understand, and follow all of the contents of this manual, including all safety cautions and warnings.
If you have any questions about these instructions contact your
Emerson sales office or Local Business Partner before proceeding.
Figure 1. Fisher HF340 HART Filter
HART COMMUNICATION
CONNECTIONS
(COMM)
FIELD INSTRUMENT
CONNECTIONS (FLD)
CONTROL SYSTEM
CONNECTIONS
(SYS)
W8283-1
HF340 Filter
September 2017
Description
The HF340 filter is used with HART communicating FIELDVUE instruments, such as DVC6200, DVC6000, or DVC2000 digital valve controllers. HART filters are used when the instrument is connected to a 4 to 20 mA DC control system output not designed for the HART (Highway Addressable Remote Transducer) communication protocol. The HF340 provides filtering and isolation between the control system and FIELDVUE instrument.
The HF340 HART filter is a passive device that is inserted in‐line with both wires of a HART 4 to 20 mA DC output loop.
The purpose of the filter is to effectively isolate the control system analog output from modulated HART communication signals. The filter receives a 4 to 20 mA DC current signal from the control system, which it shunts with a capacitor and then passes through an inductor. The low AC impedance of the capacitor prevents sudden changes in the control system current output from interfering with the HART communication. The high AC impedance of the inductor permits HART communication on the instrument side of the filter. It also prevents the voltage modulation in the HART loop from being seen by, or having an affect on, the control system output. The filter introduces a maximum input‐to‐output voltage drop of 2 volts DC at 20 mA.
www.Fisher.com
HF340 Filter
September 2017
Table 1. Specifications
Mounting
Standard 35 mm DIN rail mounting with filtering components.
Connections
Three 2‐pin cage‐clamp style connectors accept up to 12 AWG wire
Power Requirements
Input Current: 4-20 mA DC (nominal)
Input Voltage: At 20 milliamps DC, 2 volts above input voltage required by the field instrument (2 volt drop across filter at 20 milliamps DC)
Ambient Operating Temperature
-40 to 85 _ C (-40 to 185 _ F)
Ambient Relative Humidity
5 to 95%
Electromagnetic Compatibility
Meets EN 61326 1:2013
Immunity—Industrial locations per Table 2 of the EN 61326 1 standard. Performance is
Emissions—Class A
ISM equipment rating: Group 1, Class A
Instruction Manual
EU Declaration of Conformity
D102796X012
Click or scan code to access Declaration of
Conformity FCS_69 by language
Dimensions
75 mm (3 inches) long by 12.5 mm (0.5 inches) wide by 60 mm (2.4 inches) deep
Approximate Weight
0.1 kg (4 oz)
Option
HF341: Standard 35 mm DIN rail mounting without filtering components (straight through with capacitor blocking on COMM terminals)
Table 2. EMC Summary Results; Immunity
Port
Enclosure EM field
Phenomenon
Electrostatic discharge (ESD)
Basic Standard
IEC 61000‐4‐2
IEC 61000‐4‐3
Test Level
4 kV contact
8 kV air
80 to 100 MHz @ 10V/m with 1 kHz at 80%
1400 to 2000 MHz @ 3V/m with 1 kHz at 80%
2000 to 2700 MHz @ 1V/m with 1 kHz at 80%
I/O signal/control
Rated power frequency magnetic field
Burst
Surge
Conducted RF
IEC 61000‐4‐8
IEC 61000‐4‐4
IEC 61000‐4‐5
IEC 61000‐4‐6
A = During testing, normal performance within the specification limits.
1. Not applicable; only applicable to magnetically sensitive equipment.
N/A
1 kV
1 kV (line to ground only, each)
150 kHz to 80 MHz at 3 Vrms
Performance Criteria
A
A
N/A
A
A
A
The filter is normally installed near the field wiring terminals of the control system I/O. HART communication is only possible between the filter and the field instrument and at the filter COMM terminals, but not on the control system side of the filter. The filter is not designed or intended for use in the process environment. Neither the filter nor its outputs are approved for hazardous areas. However, a recommended intrinsic safety barrier can be connected between the FIELDVUE instrument and the filter in intrinsically safe installations. In most cases, if an IS barrier is used, the filter will not be needed.
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Instruction Manual
D102796X012
HF340 Filter
September 2017
Specifications
Typical specifications for the HF340 filter are shown in table 1.
Installation
temporary means of process control, then take the loop out of service. Remove the DIN interconnect blocks from the rail without disconnecting existing wiring. Install the filter on the the rail. Disconnect the wires from the control system output side of the interconnect blocks and connect them to the SYS terminals on the filter, taking care to maintain correct polarity. Disconnect the wires from the field side of the interconnect blocks and connect them to the FLD terminals on the filter, taking care to maintain correct polarity.
Figure 2. Typical Fisher HF340 HART Filter Installation
HART COMMUNICATION NETWORK
HART COMMUNICATION
INTERFACE
−
+
SYS TERMINALS
−
+
−
+
CONTROL
SYSTEM OUTPUT
TERMINALS
COMM TERMINALS
FLD TERMINALS
−
+
−
+
−
+
FIELD
COMMUNICATOR
FIELD DEVICES
3
HF340 Filter
September 2017
Instruction Manual
D102796X012
Shields
If using shielded wiring on both sides of the filter, the shield should connect across the filter. If the filter connects directly to the control system output and shielded loop wiring is being used, connect the shield to system ground on the instrument side of the filter.
HART Wiring Connections
The COMM terminals on the filter provide a convenient means to tap into the loop wiring for HART communication. A
HART communicating device, such as a multiplexer or a 475 Field Communicator can be connected to these terminals, or they may be left with no connections.
Corrective Maintenance
The most likely malfunction of a loop containing an HF340 filter is reverse polarity installation of one of the wire pairs.
The HF340 filter will work with either polarity, but misconnection could result in the wrong polarity reaching the field instrument. If the loop is not operating properly, check the polarity of the voltage at the inputs and outputs of the filter and at the inputs of the instrument.
If the instrument appears to operate properly in the loop, but communication with a non‐isolated multiplexer or PC modem is not possible, it may help to reverse the wires to the COMM terminals. The HF340 filter inserts a high impedance in the + side of the loop only. A reversal of the connections to the SYS and FLD terminals of the filter will result in the control loop operating properly, but inoperative HART communication.
Inadequate control system compliance voltage will not support filter operation. This is an installation problem that may appear initially to be a filter malfunction. For the filter to operate properly, the control system must have a compliance voltage that is at least 2 volts higher than the voltage required to drive the loop to maximum current.
Refer to the appropriate instrument instruction manual for information on determining the control system compliance voltage.
The HF340 filter is protected against accidental over‐current from sources up to 30 volts DC. If an over‐current condition occurs, the filter may be inoperative for several seconds thereafter.
Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Fisher and FIELDVUE are marks owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson
Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. HART is a registered trademark of
FieldComm Group. All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
Emerson Automation Solutions
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Cernay, 68700 France
Dubai, United Arab Emirates
Singapore 128461 Singapore www.Fisher.com
4
2001, 2017 Fisher Controls International LLC. All rights reserved.
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