ENV 50091-3 : 98 AMD 1 99

Foreword
1 General
      1.1 Scope
      1.2 Object
      1.3 Normative references
      1.4 General terms and definitions
2 General ambient service conditions
      2.1 Normal environmental and climate service
             conditions
      2.2 Ambient storage and transportation conditions
3 Electrical service conditions and performance
      3.1 UPS input specifications
      3.2 UPS output specifications
      3.3 Single UPS with by-pass
      3.4 Control and monitoring signals
      3.5 Stored and restored energy mode of operation
      3.6 Electromagnetic compatibility
4 Electrical tests for UPS
      4.1 General
      4.2 UPS testing procedure
      4.3 Type tests of manufacturers declared
             characteristics
      4.4 UPS test specification - factory witness
             tests/on-site testing
5 Non-electrical tests
      5.1 External characteristics
      5.2 Environmental and transportable test methods
      5.3 Acoustic noise
6 Compliance tests
      6.1 Classification of uninterruptible power systems
             by performance
      6.2 Technical data sheets - Manufactured declared
             specification
Annex A (normative) Reference non-linear load
Annex B (normative) Input mains failure - test methods
Annex C (normative) Determination of output dynamic
                    performance classification
      C.1 - General consideration
      C.2 - Test methods and instrumentation
      C.3 - Sinusoidal waveshapes and resistive loading
      C.4 - Non-sinusoidal waveforms (trapezoidal/quasi-
            square/square)
      C.5 - Change of operating mode - step resistive load
            test methods
      C.6 - Change of mode - step load reference non-linear
            load test circuit
Annex D (informative) Purchaser specification guidelines
      D.1 - Type of UPS, additional features and system
            requirements
      D.2 - UPS input
      D.3 - Load to be operated from UPS
      D.4 - UPS output
      D.5 - Battery (where applicable)
      D.6 - General application requirements and special
            service conditions
      D.7 - Electromagnetic compatibility
      D.8 - Types of uninterruptible power systems (UPS)

Applicable to electronic uninterruptible power systems (UPS) with electrical energy storage means on the d.c. link. The primary function of the UPS that is covered by this Prestandard is to ensu re continuity of an alternating power source; it may also improve the quality of the power source by keeping within defined limits.