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PRECISION FILTERS Precision 28718 Installation And Programming Instructions

Octal-channel signal conditioner for voltage, rtd, and 4-20 ma sensors
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Installation and Programming Instructions
Precision 28718
Octal-Channel Signal Conditioner for Voltage,
RTD, and 4-20 mA Sensors
November 8, 2023
Precision Filters, Inc.
240 Cherry Street
Ithaca, New York 14850
www.pfinc.com
I SO
9 00 1
C ER TIFIE D QUALI T Y

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Summary of Contents for PRECISION FILTERS Precision 28718

  • Page 1 Installation and Programming Instructions Precision 28718 Octal-Channel Signal Conditioner for Voltage, RTD, and 4-20 mA Sensors November 8, 2023 Precision Filters, Inc. 240 Cherry Street Ithaca, New York 14850 www.pfinc.com I SO 9 00 1 C ER TIFIE D QUALI T Y...

  • Page 2: Trademark Information

    Precision Filters’ Control GUI Software Copyright © 2023 Precision Filters, Inc., All Rights Reserved. Trademark Information The following terms and names are trademarks of Precision Filters, Inc. in the United States and/or other countries: • Balanced Constant Current and BCC •...

  • Page 3: Safety Notices

    Do not proceed beyond a WARNING statement until the conditions are fully understood and met. Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...

  • Page 4: Safety Information

    Site Preparation and Installation section of this manual. Do not install substitute parts or perform any unauthorized modification to the product. Return the product to Precision Filters, Inc. for service and repair to ensure that safety features are maintained. See the “Support and Service” supplement in this document for information on how to contact Precision Filters.

  • Page 5: Table Of Contents

    2.7 Sensor Wiring................20 Precision Filters, Inc.
  • Page 6 All Gains Auto Offset Correct........... . .42 28718 Operation and Maintenance Instructions Precision Filters, Inc. Rev. -...
  • Page 7 5.2 Service and Repair ..............62 Precision Filters, Inc.
  • Page 8 28718 Table of Contents Page vi This page intentionally left blank 28718 Operation and Maintenance Instructions Precision Filters, Inc. Rev. -...

  • Page 9: 28718 General Information

    Page 1 28718 General Information Introduction This manual, Precision 28718 Octal-Channel Conditioner for Voltage, RTD, and 4-20 mA Sensors: Installation and Programming Instructions, contains information specific to the installation, setup, and operation of the 28718 card operating with 28000-GUI-WIN (GUI) software.

  • Page 10: 28718 Overview

    64, 32, or 16, respectively. In addition, the 28718 may be mixed with other conditioner cards in the 28000 family to accommodate complex measurement applications. 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...

  • Page 11: Dual-Mode Excitation Supply

    (shock) measurements and time-domain waveform analysis. A fully buffered output with more than 5 mA of drive capability may be used to drive long output cable runs. Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...

  • Page 12: 28718 Features

    • Outputs on 26-pin D connector that is integral to the 28000 system M5 chassis • Auxiliary front panel output connection to support multiple buffered outputs or RMS to DC using plug-on adapter modules 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...

  • Page 13: 28718 Specifications

    1.2 pA/√Hz @ 1 kHz 0.1-10 Hz Pk-Pk Noise: 400 pA 28718 Input Characteristics: Type: DC coupled, balanced differential input w/ shield Input Operating Modes: ±10 V, ±60 V, 4-20 mA (500 Ω sense) Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...

  • Page 14: Input Protection

    4-20 mA Sense Mode: Resistance: 500 Ω, 0.035% sense resistor Total Input Impedance: 500 Ω Voltage on Input Terminals: Input current (4-20 mA) x 500 Ω Drift: 17 µV/ºC, typical 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...
  • Page 15 Filter Bypass: Bypasses filter but not amplifier stages. Bypass Bandwidth: 190 kHz, typical Custom Filters: Other filter characteristics and cutoff frequencies are available. Please consult with factory for more information. Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...

  • Page 16: Specification

    1 µV/ °C, RTI + 100 µV/ °C RTO, typical (17 µV/ °C RTO in 4-20 mA mode) Noise: 5 µV rms RTI + 100 µV rms RTO, typical 3 Hz to 100 kHz Output Protection: Short circuit protection (excitation and signal out) 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...

  • Page 17: General Characteristics

    Two 26-pin high-density D connectors are utilized for the eight inputs (4 inputs per connec- tor). Connectors have high quality machined gold plated pins/sockets. 1.5.2 Output Connectors A summary of 28718 card compatibility with Precision Filters chassis model numbers is provided below: • 28016-M5, 28008-M3/M5, 28004-M3/M5 or 28002-M5: Output connectors are integral to the 28016-M5, 28008-M3/M5, 28004-M3/M5 and 28002-M5 chassis rear panels.

  • Page 18: Accessories

    Accessories 1.6.1 Mating Connectors Precision Filters mating connectors accommodate up to 22-AWG wire and are supplied with high-quality metal backshells and gold plated screw machined contacts for high reliability connections and long service life. CONN-IN-26D High-density 26-pin D-shell mating input connector with machined crimp pins and metal backshell with strain relief.
  • Page 19 50, 100, 200, 500, 1000 FX01 (Hz): 100, 300, 1k, 3k, 10k FX02 (Hz): 300, 1k, 3k, 10k, 30k Shield (–) Input Short Test Input Figure 3 28718 Channel Block Diagram Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...
  • Page 20 28718 General Information Page 12 This page intentionally left blank 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...

  • Page 21: 28718 Setup And Installation

    The system must be installed and operated in an area that meets and can maintain the environmental specifications shown in Table 1. Table 1 Environmental Requirements: Operation Maximum temperature 40°C (104°F) Minimum temperature 0°C (32°F) Relative humidity Less than 90% (noncondensing) Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...

  • Page 22: Physical Requirements

    If the shipping container has been damaged in any way, have the carrier’s agent present when the equipment is unpacked. If the equipment is damaged, file a claim with the carrier and forward a copy to Precision Filters. Retain the shipping container and packing material for the carrier’s inspection or for reuse.

  • Page 23: Storage, Transport, And Shipment

    2.4.3 Shipment Requirements Always use the original packing materials to ship system components. A shipping container can be purchased from Precision Filters. The environmental conditions described in Table 2 must be maintained during shipment. Precision Filters, Inc. 28718 Installation and Programming Instructions...

  • Page 24: Install Cards

    When the system is powered up, the controller recognizes the location of the installed cards in the system and generates the appropriate GUI displays for these cards. 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...

  • Page 25: Address Conventions

    The CARD index and SLOT index are equivalent; the SLOT index is denoted with the J prefix. In the GUI, only the numeric CARD index is displayed. For example, SLOT J2 = CARD 2. Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...

  • Page 26: Install Cables

    Channels Connector (P3) Pin 1 Pin 26 Input Channels Connector (P2) Pin 1 Figure 4 Rear-panel input connectors Table 3 summarizes the input connector pin assignments for the 28718 card. 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...

  • Page 27: Input Cabling And Input Shielding

    60 VDC relative to signal ground. In ±60 V mode, a signal plus common-mode level of up to 60 VDC is supported. Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...

  • Page 28: Sensor Wiring

    (V ). If R , then the lead resistance error will be half that of the 2-wire configuration. 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...

  • Page 29: 4-Wire Connection

    EXC (+) 0.1 mA Sensor Signal (+) = EXC * R Signal (–) – EXC (–) Signal Ground Shield 28718 Figure 7 28718 4-wire connection Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...

  • Page 30: 4-20 Ma Current Output Sensors

    Excitation (+), Excitation (˗), and Signal (+) leads. A precision 500 Ω resistor is used to convert the current loop to a voltage that is sensed by the differential amplifier. 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...

  • Page 31: 28718 Output Connections

    Table 4. Table 4 28718 Conditioner Card Rear-Panel Output Connections +SIGNAL −SIGNAL SHIELD Channel Mating connectors: CONN-OUT-26D or CONN-OUT-26D-SC Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...

  • Page 32: 28002-M5 2-Slot Mainframes

    J400 through J407, supporting the outputs for 2-, 4-, 8-, and 16-channel cards. The output connectors are located on the rear center panel of the mainframe. See Figure 12. 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...

  • Page 33: 28016-M5 16-Slot Mainframes

    Figure 13 28016-M5 rear-panel 26-pin output connectors Output Cable and Output Shielding Precision Filters recommends that devices connected to 28718 outputs have differential inputs or isolated single-ended inputs. To prevent ground loops, avoid devices that use single-ended inputs with a common ground.

  • Page 34: Auxiliary Front-Panel Output Connector

    2.7.4 Auxiliary Front-Panel Output Connector The 28718 card provides a front-panel auxiliary output connector Precision Filters offers add- on modules for this connector that provide additional buffered outputs for each card channel. Pin assignments for the auxiliary connector are given in Table 5.

  • Page 35: Buff-8Ch/(2)Hd26D Output Adapter

    When the switch is set to SENSE, the channel – Signal output lines are not connected to the shield and output sense is enabled. Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...
  • Page 36 28718 Setup and Installation Page 28 OUTPUTS Figure 16 BUFF-8CH/(2)HD26D Buffer Module Table 6 Output Connector Pin Assignments for Both A and B 26-Pin Connectors –Signal Channel +Signal Shield Mating Connectors: CONN-OUT-26D, CONN-OUT-26D-SC 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...

  • Page 37: 28000-Rms/Dc8 Converter

    D-shell connector. Table 7 identifies the pin assignments of the 26-pin D-shell output connector. Table 7 28000-RMS/DC8 Output Connector Pin Assignments Signal (+) Signal Channel 0 (−) Signal Shield (+) Signal Channel 1 (−) Signal Shield Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...
  • Page 38 Channel 4 (−) Signal Shield (+) Signal Channel 5 (−) Signal Shield (+) Signal Channel 6 (−) Signal Shield (+) Signal Channel 7 (−) Signal Shield Chassis Ground – 9, 18 28718 Installation and Programming Instructions Precision Filters, Inc. Rev. -...
  • Page 39 28718 Setup and Installation Page 31 This page intentionally left blank Precision Filters, Inc. 28718 Installation and Programming Instructions Rev. -...

  • Page 40: 28718 Operating Instructions

    The System Monitor panel controls the output to the MONITOR connector on the 28000 BIF controller card. See Section 3.2.2, System Monitor for available monitor points. 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.
  • Page 41 • Channel Control Section The Channel Control section allows for programming of individual channels in a control group. • Message Window This window displays various warning messages and error codes. Rev. - 28718 Operating Instructions Installation and Programming Instructions Precision Filters, Inc.

  • Page 42: 28718 Setup Options

    The monitor source is a selected system channel or an external test signal from the TEST BUS input connector. 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.
  • Page 43 When the 28000 power is turned off, the monitor relay opens so as to not load down other systems that are using a daisy-chained monitor bus. Rev. - 28718 Operating Instructions Installation and Programming Instructions Precision Filters, Inc.

  • Page 44: Channel Fault/Overload Indicators

    3.2.3 Channel Fault/Overload Indicators The 28718 card has two channel overload/fault indicators, as shown in Figure 21: • OVL: Channel Fault/Overload indicator • CL: Current Limit indicator 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 45: Channel Fault/Overload (Ovl)

    The 24 V excitation current is monitored and reported if the excitation has reached the maximum current that can be supplied. Possible causes of current limit are incorrect ex- citation wiring or a shorted (or faulty) transducer. Rev. - 28718 Operating Instructions Installation and Programming Instructions Precision Filters, Inc.

  • Page 46: Muting Channels

    GUI panel but will not be applied to the hardware until the channel MUTE mode is OFF. When the MUTE button is OFF, all channel functions and settings are returned to normal. Figure 23 Mute button 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 47: Excitation Mode

    Configures the input stage to receive 4-20 mA current signals. Channel sensitivity in 4-20mA mode is V(out) = I(in) x 500Ω, where I(in) is the current that is sensed across the input terminals. Rev. - 28718 Operating Instructions Installation and Programming Instructions Precision Filters, Inc.

  • Page 48: Gain Settings

    MEAS. button in a channel row to update an individual channel. 3.2.9 Low-Pass Filter Options The Low-Pass Filter Options panel, shown in Figure 28, provides settings for the low-pass filter type (FTYPE), cutoff frequency (FC), and filter bypass option (BYP). 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 49: Low-Pass Filter Type

    100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz • 28718-FX02-LP4FP 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz Figure 29 Selecting a cutoff frequency for the FX02 low-pass filter Rev. - 28718 Operating Instructions Installation and Programming Instructions Precision Filters, Inc.

  • Page 50: Low-Pass Filter Bypass

    (Figure 32). When the button is selected, the routine is run on the select- ed channel. When complete, a green LED icon labeled by channel number will appear if the 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 51: Vref Auto Adjust

    When initiated the auto adjust routine corrects the internal DC reference for the 100 μA current sources to compensate for any long-term drift or aging. Rev. - 28718 Operating Instructions Installation and Programming Instructions Precision Filters, Inc.
  • Page 52 28718 Operating Instructions Page 44 This page intentionally left blank 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 53: Lcs Remote Command Line Interpreter

    IP address (Host) and TCP port number. The system’s TCP port number is 28000, and its default IP address is 169.254.1.221. Figure 33 Tera Term New Connection panel Rev. - 28718 Installation and Programming Instructions Precision Filters, Inc.

  • Page 54: Lcs Command Format

    Commands and arguments are case sensitive and are entered using lower-case alpha- betic characters. Numeric command values are automatically rounded to the nearest correct setting. Most commands are followed by a response that verifies the command was processed. 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 55: Command Syntax Conventions For Manual

    PF28K: chstate:?; and would return the status (“ON” or “OFF”) for each channel. Note: The cmd and chstate commands are NOT real commands. They are used here to illustrate syntax conventions. Rev. - 28718 Installation and Programming Instructions Precision Filters, Inc.

  • Page 56: System Commands

    • LCS software version number • Date and time of last build For example, entering the idn command PF28K: idn; returns idn:Precision Filters 28000 LCS version S12194V4.1, built Apr 28 2023, 08:38:12; 4.4.3 System Configuration The config command displays the system configuration. config:[?];...

  • Page 57: Context

    To display the channels currently set to accept commands, enter context at the prompt. For example, entering PF28K: context:?; returns context:0,1,2,3,4,5,6,7; By default, all 8 channels (0 through 7) will accept channel-level commands and requests for reports. Rev. - 28718 Installation and Programming Instructions Precision Filters, Inc.

  • Page 58: Test Mode

    • Test Bus Test Bus mode switches the channel input source to the system’s front panel TEST BUS connector, which allows for input from an external signal generator without disconnecting 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 59: System Monitor Output Options

    To direct the output of a channel to the MONITOR connector, type mon: followed by the channel number. For example, to connect the output of channel 1 to the system monitor enter PF28K: mon:1; which returns Rev. - 28718 Installation and Programming Instructions Precision Filters, Inc.

  • Page 60: Monitor Card Test Bus

    PF28K: mon:short; which returns mon:short; Monitor External Test To monitor an external test signal sent directly to the TEST BUS BNC connector, enter PF28K: mon:extcal; which returns 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 61: Monitor Float

    The monlist command displays the channel and card monitoring options: monlist:[<channel>]; For example, requesting the monitor points for channel 0 PF28K: monlist:0; returns monlist for channel 0: <OUT>, <CARD:TESTBUS>, <CARD:CUR_MON>; Rev. - 28718 Installation and Programming Instructions Precision Filters, Inc.

  • Page 62: Check Overloads

    The check_ovlds command will return a CL response if the 24 V excitation source has reached the maximum current that it can supply (= 50 mA). For example, if System 0, Channel 0 and System 0, Channel 2 are in current limit, then entering 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 63: Muting Channels

    … 4.4.9 Setting Gain The gain command reports and sets the programmable gain to either x1, x2, x5, x10, x20, x50, x100, x200, x500, or x1000. gain:[1|2|5|10|20|50|100|200|500|1000|?],[<channel list>]; Rev. - 28718 Installation and Programming Instructions Precision Filters, Inc.

  • Page 64: 4.4.10 Input Mode

    4.4.11 Excitation Mode The exc_mode command is used to set or report the excitation mode. exc_mode:[CURRENT|VOLTAGE|?],[<chan_list>]; For example, to set the excitation mode to CURRENT on channel 6, enter PF28K: exc_mode:CURRENT,6; 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 65: 4.4.12 Current Load, Voltage Load, And Loop Resistance Monitors

    The read_r command reports the loop resistance of the sensor and conductor wires. read_r:[?],[<chan_list>]; For example, if the loop resistance on channel 0 is 10020 Ω, then entering PF28K: read_r:?,0; returns read_r:10020,0; Rev. - 28718 Installation and Programming Instructions Precision Filters, Inc.

  • Page 66: Health Monitor: Quick Access

    For example, to select the LP4P filter with a cutoff frequency of 1 kHz on channel 1, enter PF28K: ftype:LP4P,1; which returns ftype:LP4P,1; and then enter PF28K: fc:1000,1; which returns fc:1000,1; 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.

  • Page 67: 4.4.14 Auto Adjust

    Note: The PF28K: prompt is not displayed until the routine is complete. The command format to run the VREF Auto Adjust routine is: offsetadj_all:run,[<chan_list>]; For example, to run the VREF Auto Adjust routine on channel 0, enter PF28K: bif_offsetadj:run; Rev. - 28718 Installation and Programming Instructions Precision Filters, Inc.
  • Page 68 28718 LCS Command Line Interpreter Page 60 which returns bif_offsetadj:PASS; upon successful completion. 28718 Installation and Programming Instructions Rev. - Precision Filters, Inc.
  • Page 69 28718 LCS Command Line Interpreter Page 61 This page intentionally left blank Rev. - 28718 Installation and Programming Instructions Precision Filters, Inc.

  • Page 70: Support And Service

    Customer Service E-Mail: customer-service@pfinc.com Fax: 607-277-4466 Service and Repair If equipment is being returned to Precision Filters for service or repair, contact the factory for a Return Authorization Number. To obtain a Return Authorization Number, contact Precision Filters: Phone: (607) 277-3550...
  • Page 71 Support and Service Page 63 This page intentionally left blank. Precision Filters, Inc. 28718 Operation and Maintenance Instructions Rev.-...