Safety In Application; Building In Safety; Fmea (Failure Mode And Effect Analysis) Iec En 61508; Hazard And Risk Analysis Iso 12100-1 / 14121 - Danfoss PVE Series 4 Technical Information

Technical Information

Safety in application

PVE, Series 4 for PVG 32/100/120 and PVHC

Building in safety

All brands and all types of control valves (incl. proportional valves) can fail. Thus the necessary protection
against the serious consequences of function failure should always be built into the system. For each
application an assessment should be made for the consequences of pressure failure and uncontrolled or
blocked movements.
To determine the degree of protection that is required to be built into the application, system tools such
an FMEA (Failure Mode and Effect Analysis) and Hazard and Risk Analysis can be used.

FMEA (Failure Mode and Effect Analysis) IEC EN 61508

FMEA is a tool used for analyzing potential risks. This analytical technique is utilized to define, identify,
and prioritize the elimination or reduction of known and/or potential failures from a given system before
it is released for production. Please refer to IEC FMEA Standard 61508.

Hazard and risk analysis ISO 12100-1 / 14121

This analysis is a tool used in new applications as it will indicate whether there are special safety
considerations to be meet according to the machine directives EN 13849. Dependent on the determined
levels conformety this analysis will detirmine if any extra requirements for the product design,
development process, production process or maintenance, i.e. the complete product life cycle.
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Warning
All brands and all types of directional control valves – including proportional valves – can fail and cause
serious damage. It is therefore important to analyze all aspects of the application. Because the
proportional valves are used in many different operation conditions and applications, the machine
builder/ system integrator alone is responsible for making the final selection of the products – and
assuring that all performance, safety and Warning requirements of the application are met.

Control system example

Example of a control system for manlift using PVE Fault monitoring input signals and signals from
external sensors to ensure the PLUS+1
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Warning
It is the responsibilty of the equipment manufacturer that the control system incorporated in the
machine is declared as being in confirmity with the relevant machine directives.
520L0553 • Rev GD • Jan 2014
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main controllers correct function of the manlift.
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