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ASHRAE Standard 222-2025 -- Standard Method of Test for Electrical Power Drive Systems (ANSI/ASHRAE Approved), 2025
- ASHRAE Online Bookstore
- Addenda
- Errata
- Return to Previous Page
- ANSI/ASHRAE Standard 222-2025 [Go to Page]
- Contents
- Foreword
- 1. Purpose
- 2. Scope [Go to Page]
- 2.1 The standard is intended for HVAC&R applications that operate from low voltage (≤690 V).
- 2.2 This standard applies to adjustable speed electric power drive systems, which combine semiconductor power converters, including means for their control, protection, monitoring, and measurement with connected electric motors. All electric rotary m...
- 2.3 This standard includes the following:
- 3. Definitions [Go to Page]
- 3.1 Abbreviations
- 3.2 Quantity Symbols and Unit Symbols. See Table 1.
- 4. Power Drive System Classifications [Go to Page]
- 4.1 Power Drive System with a Separate Power Converter. Separate power converters are designed for use with interchangeable motors that users connect with cables. For complete drive module rating programs that use this standard, it is necessary that ...
- 4.2 Power Drive System with an Integral Power Converter. Power drive systems with power converters that are completely integrated in motor casings are not safely separable by users in the HVAC&R field. This standard does not support electrical measur...
- 5. General Requirements [Go to Page]
- 5.1 General Test Requirements
- 5.2 Test Instruments
- 5.3 Test Conditions. The test plan shall itemize the test conditions. These conditions originate from the following:
- 5.4 Power Source Requirements
- 6. Installation and Operation [Go to Page]
- 6.1 Installation. The power drive system (PDS) shall be installed and operated per manufacturers’ installation and operation manuals with modifications as required by this standard.
- 6.2 Motor Conductor Length. The lengths of the conductors between the complete drive module (CDM) and motor have a significant effect on motor insulation stress, in terms of both peak voltage and voltage rise time. For the class of PDSs with separate...
- 6.3 Instrumentation Application and Location. Instrumentation shall be applied as shown in Figures 1 through 4, as applicable.
- 6.4 Complete Drive Module Settings. The test plan shall provide a text description or schematic diagram sufficient to define the configured state of all CDM hardware and software settings used to achieve the test conditions, whether overridden or not...
- 7. Test Procedure [Go to Page]
- 7.1 Test Procedure for AC Supplied Devices
- 7.2 Test Procedure for DC Supplied Devices
- 8. Calculations [Go to Page]
- 8.1 Adjustment for Bias Errors. Mean bias errors, if any, shall be subtracted from the measured values to remove offsets from true values. A positive mean bias error means that the measured value is greater than the true value, so the bias error is s...
- 8.2 Total Harmonic Current Distortion THDi
- 8.3 Total Harmonic Voltage Distortion THDv
- 8.4 Motor Output Power Po
- 8.5 Drive System Efficiency ηsys
- 9. Test Report [Go to Page]
- 9.1 Test Report For AC Sourced Systems. The test report shall document the results of the test as specified in the test plan and include, but not be limited to, the following information:
- 9.2 Test Report For DC Sourced Systems. The test report shall document the results of the test as specified in the test plan and include, but not be limited to, the following information:
- 10. Normative References
- Informative Appendix A: Illustration of a Pulse-Width-Modulation Voltage Pulse at a Motor’s Input Terminals
- Informative Appendix B: Calculating AC Source Impedance
- Informative Appendix C: Calculating DC Source Ripple
- Informative Appendix D: Derivation of Motor Output Power Equations
- Informative Appendix E: Informative References [Go to Page]
