Flowserve Limitorque MX User Manual

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Installation
Operation
Maintenance
SAFETY MANUAL
Limitorque MX Electronic Actuator
FCD LMENIM2350-02 A4 – 05/16

Flowserve Limitorque MX Specifications

General

Brand	Flowserve
Model	Limitorque MX
Category	Controller
Language	English

Summary

Safety Integrity Level (SIL)

Failure Rates/Failure Modes

Defines failure rates and categorizes them into Safe/Dangerous and Detected/Undetected states.

Partial Stroke Test (PST) Period

Specifies the required frequency for performing Partial Stroke Tests.

Proof Test Period (Tpt)

Defines the required frequency for full stroke proof testing.

PFDavg

Defines PFDavg as the average probability of failure on demand.

SIL vs PFDavg vs RFF

Presents a table correlating SIL levels with PFDavg and RFF values.

Safety Requirements

Monitor Relay Annunciation

Describes how the monitor relay indicates system failures or unavailability.

Partial Stroke Test Interval

Reiteration of the monthly PST requirement.

Proof Test Interval

Reiteration of the annual proof test requirement.

Basic Safety Configuration Requirements

Design for Safety

LimiGard™

Details the LimiGard system for digital command monitoring and fault detection.

Safety Critical User Wiring

Explains extending LimiGard to user wiring for enhanced PST/ESD.

MXa Safety

PFDavg for MXa Actuator without PST

Presents PFDavg values for the basic actuator without PST.

PFDavg for MXa Actuator with PST

Presents PFDavg values for the actuator with monthly PST.

Partial Stroke Testing (PST)

Basic PST Description

Describes the basic PST functionality and its testing scope.

Enhanced PST Description

Describes the enhanced PST, extending coverage to user wiring and SIS control.

Basic PST Configuration Options and Operation

Actions on Recognition of Valid PST Signal

Actions Upon Successful Completion of the PST Stroke

PST Failure Events and Actions

Details PST failure events and the corresponding actuator actions.

Safety Instrumented System (SIS) Assessment

Commissioning

PST and PST/ESD Configuration

Basic Configuration

Enhanced Configuration

Set Up Basic ESD and PST

Details the dialog flow for setting up basic ESD and PST.

Set Up Enhanced ESD and PST

Details the dialog flow for setting up enhanced ESD and PST.

Emergency Shutdown (ESD)

Configurable ESD Actions

Lists the available configurable actions for ESD signals.

Configurable ESD Overrides

Details ESD overrides for various protection features and associated warranty implications.

Custom Input Mode – Momentary ESD/PSESD (Optional)

ESD (Emergency Shutdown) Overrides

ESD Override Setup Procedure

Outlines the procedure for configuring ESD priority over other events.

Figure 11.2 - Configuring SIF (ESD)

Failure Analysis

Table 12.1 - Expected Operation for Various Input Signal Combinations

Table detailing expected operation based on input signal combinations.

Regulatory Information

Certification that adds HART network option board with up to SIL3 capable rating

Details the exida certification for the actuator and option boards.

Original certification that added option boards with up to SIL3 capable rating

Details previous exida certification for the actuator and option boards.

Original SIL 3 capable certification for MXa actuator

Details original SIL 3 capability certification for MXa actuator.