NEN EN 574 : 1997 + A1 2008

Foreword
1 Scope
2 Normative references
3 Definitions
    3.1 Two-hand control device
    3.2 Input signal
    3.3 Control actuating device
    3.4 Simultaneous actuation
    3.5 Synchronous actuation
    3.6 Signal converter
    3.7 Signal processor
    3.8 Output signaL
    3.9 Response time
    3.10 Mobile two-hand control device
4 Types of two-hand control devices and their selection
5 Characteristics of safety functions
    5.1 Use of both hands (simultaneous actuation)
    5.2 Relationship between input signals and output
          signal
    5.3 Cessation of the output signal
    5.4 Prevention of accidental operation
    5.5 Prevention of defeat
    5.6 Re-initiation of the output signal
    5.7 Synchronous actuation
6 Requirements related to categories of control
    6.1 Category selection
    6.2 Use of category 1
    6.3 Use of category 3
    6.4 Use of category 4
7 Use of programmable electronic systems
8 Prevention of accidental actuation and of defeat
    8.1 Common considerations
    8.2 Prevention of defeat using one hand
    8.3 Prevention of defeat using hand and elbow of the
          same arm
    8.4 Prevention of defeat using the forearm(s) or
          elbow(s)
    8.5 Prevention of defeat using one hand and any other
          part of the body (eg. knee, hip)
    8.6 Prevention of defeat by blocking one control
          actuating device
    8.7 Accidental actuation
9 General requirements
    9.1 Ergonomic requirements
    9.2 Operating conditions, environmental influences
    9.3 Enclosures
    9.4 Selection, design and installation of control
          actuating devices
    9.5 Prevention of unintended output signals by
          acceleration forces
    9.6 Unintended operation of mobile and portable hand
          held machines
    9.7 Mobile two-hand control devices
    9.8 Safety distance
10 Verification
    10.1 General requirements for verification
    10.2 Visual inspection
    10.3 Performance check
    10.4 Measurement
    10.5 Prevention of defeat
11 Marking
12 Information for installation, use and maintenance
    12.1 Provision of information
    12.2 Installation instructions
Annexes
A (normative) Measurement tests for the prevention of
    defeat
B (informative) Use of categories (according to EN 954-1
    1996) in types of two-hand control devices
C (informative) Bibliography

ZA (informative) Relationship of this European Standard with
    EU Directives

Defines the safety requirements of a two-hand control device and its logic unit. It also explains the main characteristics of two-hand control devices for the achievement of safety and sets out combinations of functional characteristics for three types.