Corrective Maintenance

HF300 Series

Instruction Manual

Form 5715

June 2007

The most likely malfunction of a loop containing an HF300 Series HART filter is reverse polarity installation of one of the wire pairs. The Type 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 Type 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.

Excessive load voltage will interfere with filter operation. A transient clamping device limits the output voltage to a nominal 15 volts. If the voltage at the output (due to the total impedances connected) is greater than 14 volts DC at maximum loop current, some of the current may be shunted by the clamping device.

The Type 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.

Fisher and FIELDVUE are marks owned by Fisher Controls International LLC, a member of the Emerson Process Management business division of Emerson Electric Co. Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. HART is a mark owned by the HART Communication Foundation. 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. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use and maintenance of any product. Responsibility for the selection, use and maintenance of any product remains with the purchaser and end-user.

Emerson Process Management

Marshalltown, Iowa 50158 USA

Cernay 68700 France

Sao Paulo 05424 Brazil

Singapore 128461

www.Fisher.com

HF300 specifications

Emerson Process Management’s HF300 is a sophisticated automation solution designed to enhance control and monitoring in various industrial processes. This state-of-the-art system is widely recognized for its versatility and reliability across multiple sectors, including oil and gas, chemical, and power industries.

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