Flowserve Logix 3800zb

Questions and Answers

A
Anne SimpsonAug 3, 2025
What to do if the valve position reading is not accurate on my Flowserve Logix 3800zb?
- O
  osmithAug 3, 2025
  If the valve position reading of your Flowserve Industrial Equipment is not accurate, there are several potential causes: * The stroke might not be calibrated: Perform a Stroke calibration (Quick-Cal). * The analog input might not be calibrated: Perform an Analog input calibration. * Tight shutoff could be active: Verify Tight Shutoff settings. * Custom characterization or soft stops might be active: Verify custom characterization or soft-stop limits.
W
watkinsjenniferAug 7, 2025
What to do if my Flowserve Logix 3800zb Industrial Equipment unit does not respond to analog commands?
- J
  Jason ChangAug 8, 2025
  If your Flowserve Industrial Equipment unit doesn't respond to analog commands, it might be because: * The positioner is in digital command mode: Switch to analog command mode using the Valve Sight DTM, a handheld communicator, or by holding the hot key for 3 seconds. * An error occurred during calibration: Check Status Codes, correct the calibration error, and recalibrate.
M
Mario GlennAug 12, 2025
What to do if the position of my Flowserve Logix 3800zb is driven fully open or closed and will not respond to the command?
- C
  Christopher CurryAug 12, 2025
  If the position of your Flowserve Industrial Equipment is driven fully open or closed and won't respond to commands, consider these potential causes: * Bad stroke calibration: Perform stroke calibration (Quick-Cal). * The relay sensor or magnet is not connected: Verify hardware connections. * Incorrect air action selected in the software: Check ATO (Air-to-open) and ATC (Air-to-Close) settings and recalibrate using Quick-Cal to apply settings. * Actuator tubing is backward: Verify ATO/ATC actuator tubing.
T
tracykirkAug 16, 2025
Why am I getting erratic communications with my Flowserve Logix 3800zb Industrial Equipment?
- S
  Steven RoyAug 16, 2025
  If your Flowserve Industrial Equipment experiences erratic communications, the following could be the cause: * Current source bandwidth is not limited to 25Hz: The maximum allowable current source rate of change is 924 mA per second. * Maximum cable length or cable impedance exceeded: Check cable size, length, and capacitance. * HART modem not receiving enough power: Verify the laptop battery is not low. * Interference with I.S. barrier: Use a HART compatible I.S. barrier. * The current source is stripping (filtering) HART signal: Use a 250? resistor and a 22 µF capacitor to create a HART filter.
Z
Zachary PrattAug 20, 2025
Why is my Flowserve Industrial Equipment positioner sticking or hunting?
- S
  stricklandmichelleAug 20, 2025
  If the positioner of your Flowserve Industrial Equipment is sticking or hunting, here are potential causes: * Contamination of the 4-Way control valve: Check the air supply for proper filtering and meeting ISA specifications ISA-7.0.01. * Control tuning parameters not correct: Lower proportional gain settings using the Gain switch. * Packing friction is high: Verify the Valve and Actuator are sized properly for operating conditions. * Improper sizing of Valve/Actuator for process conditions: Verify the Valve and Actuator are sized properly for operating conditions.
C
Christine GentryAug 25, 2025
Why is the LCD backlight flickering or dim on my Flowserve Industrial Equipment?
- D
  Daniel HardinAug 26, 2025
  If the LCD backlight on your Flowserve Industrial Equipment is flickering or dim, it's likely due to the backlight using residual power not used by other circuitry functions. Fluctuations in the LCD backlight are normal, so no action is required.
D
Dana NavarroAug 29, 2025
How to fix a Flowserve Logix 3800zb when no LED is blinking?
- E
  evan65Aug 29, 2025
  If no LED is blinking on your Flowserve Industrial Equipment, it could be due to: * Current source too low: Verify the current source supplies at least 3.8 mA. * The current source voltage is too low: Verify the voltage source supplies at least 10VDC at the terminals of the device.

Flowserve Logix 3800zb Specifications

General

Manufacturer	Flowserve
Input Signal	4-20 mA
Enclosure	NEMA 4X, IP66
Communication Protocol	HART
Ambient Temperature	-40°F to 176°F (-40°C to 80°C)
Pressure Rating	Varies depending on valve body
Body Materials	Carbon Steel, Stainless Steel, Alloy Steel
Trim Materials	Stainless Steel, Alloy Steel
Flow Characteristic	Linear, Equal Percentage, Quick Opening
Leakage Class	ANSI Class IV, V, VI
End Connections	Flanged, Threaded, Socket Weld, Butt Weld

Summary

QUICK START GUIDE

Logix 3800 zb Positioner Features

Overview of the Logix 3800zb positioner's external components and features.

SAFETY INFORMATION

Using This Document and Safety Terms

Guidelines for manual usage and definitions of safety terms like NOTE, CAUTION, WARNING, DANGER.

Personnel, Variations, and Service

Requirements for personnel, handling product variations, and service/repair guidelines.

Natural Gas Service Precautions

Information and precautions regarding the use of natural gas as an actuation medium.

PRE-INSTALLATION

Storage, Unpacking, and Inspection

Recommendations for storing, unpacking, and inspecting the positioner before installation.

Label Verification

Ensuring the positioner's certification labels match the intended application.

INSTALLATION

Mounting Procedures

Detailed steps for mounting the positioner to specific linear valve types.

Tubing and Pneumatic Connections

Covers tubing, gas supply, port connections, purging, venting, and remote mount tubing.

Electrical Connections and Wiring

Covers terminals, command input, compliance, cables, conduit, grounding, EMC, and auxiliary I/O circuits.

OPERATION

How it Works and Control Loop

Explains basic operation, position definition, command input, characterization, and the stem-positioning control loop.

DIP Switch Configuration

Configuration settings for air action, actuator type, characterization, auto-tune, and calibration modes.

Calibration and Control Procedures

Step-by-step procedures for automatic and manual valve stroke calibration.

User Interface and Diagnostics

Covers LCD display, LEDs, status codes, write protect, BST, and diagnostic levels.

MAINTENANCE

Troubleshooting Common Issues

Common failures, probable causes, and corrective actions for HART communication and operation issues.

Repair and Replacement Procedures

Guides on cleaning, replacing electronics, and replacing shaft assembly.

Help and Support Information

Contact information for Flowserve support and procedures for returning the unit for service.

SPECIFICATIONS

Signal, Pneumatic, and Analog Output Specs

Specifications for input signal, pneumatic supply, and analog output.

Stroke, Remote Mount, and Performance Specs

Details on valve stroke rotation, remote mount requirements, performance characteristics, and temperature limits.

Physical, Software, and Hazardous Location Specs

Covers physical dimensions, software specs, hazardous location certifications, and safety conditions.

APPENDICES

Menu Tree Overview and Descriptions

Detailed explanations of the LCD menu structure and features.

Flow Characterization Options

Programmed characterization curve options and their graphical representation.

Status Code Descriptions

Comprehensive listing of status codes, their causes, and recommended solutions.

Hot Keys Reference

Quick button combinations for accessing various features and calibrations.

Ordering and Model Code Information

Spare parts kits, mounting kits, and guidance on selecting the positioner model code.

Related product manuals

Flowserve Limitorque HBC Series

24 pages

Limitorque Accutronix MX

126 pages

Flowserve 400-D

12 pages

Flowserve Logix 3800zb - User Manual

Table of Contents