National Instruments NI-9242 Getting Started Manual
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National Instruments NI-9242 Getting Started Manual

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Summary of Contents for National Instruments NI-9242

  • Page 1 NI-9242...
  • Page 2 GETTING STARTED GUIDE NI 9242 3 AI/1 Neutral, 250 Vrms L-N/400 Vrms L-L, 24 Bit, 50 kS/s/ch Simultaneous...

  • Page 3: Safety Guidelines

    This document explains how to connect to the NI 9242. Before you begin, complete the software and Note hardware installation procedures in your chassis documentation. The guidelines in this document are specific to Note the NI 9242. The other components in the system might not meet the same safety ratings.

  • Page 4: Safety Voltages

    Other examples are wiring, including cables, bus bars, junction boxes, switches, socket outlets in the fixed installation, and stationary motors with permanent connections to fixed installations. NI 9242 Getting Started Guide | © National Instruments | 3...

  • Page 5: Safety Guidelines For Hazardous Voltages

    Do not connect the NI 9242 to signals or use Caution for measurements within Measurement Category IV. Safety Guidelines for Hazardous Voltages If hazardous voltages are connected to the device, take the following precautions. A hazardous voltage is a voltage greater than 42.4 Vpk voltage or 60 VDC to earth ground.

  • Page 6: Safety Guidelines For Hazardous Locations

    Class I, Division 2. For Division 2 and Zone 2 applications, Caution install the system in an enclosure rated to at least IP54 as defined by IEC/EN 60079-15. NI 9242 Getting Started Guide | © National Instruments | 5...
  • Page 7 Special Conditions for Hazardous Locations Use in Europe and Internationally The NI 9242 has been evaluated as Ex nA IIC T4 Gc equipment under DEMKO Certificate No. 12 ATEX 1202658X and is IECEx UL 14.0089X certified. Each NI 9242 is marked II 3G and is suitable for use in Zone 2 hazardous locations, in ambient temperatures of -40 °C ≤...

  • Page 8: Electromagnetic Compatibility Guidelines

    Furthermore, any changes or modifications to the product not expressly approved by National Instruments could void your authority to operate it under your local regulatory rules. NI 9242 Getting Started Guide | © National Instruments | 7...

  • Page 9: Special Conditions For Marine Applications

    Special Conditions for Marine Applications Some products are Lloyd’s Register (LR) Type Approved for marine (shipboard) applications. To verify Lloyd’s Register certification for a product, visit ni.com/certification and search for the LR certificate, or look for the Lloyd’s Register mark on the product.

  • Page 10: Preparing The Environment

    Operating humidity 10% RH to 90% RH, (IEC 60068-2-78) noncondensing Pollution Degree Maximum altitude 5,000 m Indoor use only. Refer to the device datasheet on ni.com/manuals Note for complete specifications. NI 9242 Getting Started Guide | © National Instruments | 9...
  • Page 11 NI 9242 Pinout Neutral 10 | ni.com | NI 9242 Getting Started Guide...
  • Page 12 Neutral Referenced, single-ended analog input connection Connecting Phase Measurements The NI 9242 accepts three-phase and single-phase measurement configuration. Three-Phase Measurement Configurations NI recommends the following three-phase connection types. NI 9242 Getting Started Guide | © National Instruments | 11...
  • Page 13 4-Wire WYE Measurement Configuration Phase A Phase B Phase C Neutral Neutral NI 9242 12 | ni.com | NI 9242 Getting Started Guide...
  • Page 14 High-Leg Delta Measurement Configuration Phase A Phase B Phase C Neutral Neutral NI 9242 NI 9242 Getting Started Guide | © National Instruments | 13...
  • Page 15 3-Wire Delta Measurement Configuration Phase A Phase B Phase C NI 9242 14 | ni.com | NI 9242 Getting Started Guide...
  • Page 16 NI 9242 Corner grounded 2-wire delta measurement configurations support only standard service levels up to 240 Vrms L-L. Connecting Single-Phase Measurement Configurations NI recommends the following single-phase connection types. NI 9242 Getting Started Guide | © National Instruments | 15...
  • Page 17 3-Wire Measurement (Split Phase) Configuration Neutral NI 9242 2-Wire Measurement Neutral NI 9242 16 | ni.com | NI 9242 Getting Started Guide...

  • Page 18: Potential Transformer Connections

    Potential Transformer Connections The NI 9242 accepts the following potential transformer connections. NI 9242 Getting Started Guide | © National Instruments | 17...
  • Page 19 4-Wire WYE-to-WYE (Full) Phase A Phase B Phase C Neutral NI 9242 18 | ni.com | NI 9242 Getting Started Guide...
  • Page 20 You can use a lower ratio transformer due to the typically low voltages on the Neutral terminal. Ensure that you scale each NI 9242 channel reading with the corresponding transformer ratio. NI 9242 Getting Started Guide | © National Instruments | 19...
  • Page 21 4-Wire WYE-to-WYE (Partial) Phase A Phase B Phase C Neutral NI 9242 20 | ni.com | NI 9242 Getting Started Guide...
  • Page 22 Phase B Phase C NI 9242 You can use the Neutral channel for any other Note measurement if the measurement does not exceed the Neutral-to-Earth and L-N input range. NI 9242 Getting Started Guide | © National Instruments | 21...
  • Page 23 Delta-to-WYE Phase A Phase B Phase C NI 9242 22 | ni.com | NI 9242 Getting Started Guide...
  • Page 24 Phase B Phase C NI 9242 You can use the Neutral channel for any other Note measurement if the measurement does not exceed the Neutral-to-Earth and L-N input range. NI 9242 Getting Started Guide | © National Instruments | 23...
  • Page 25 3-Wire WYE-to-WYE Phase A Phase B Phase C NI 9242 Potential Transformer Ratio Scaling When measuring voltages using potential transformers, scale the NI 9242 readings with your application software using the 24 | ni.com | NI 9242 Getting Started Guide...

  • Page 26: Connection Guidelines

    To ensure that measurements to chassis ground are correct, NI recommends connecting the chassis to earth ground using the chassis grounding screw. Refer to your chassis manual for information about connecting the chassis to earth ground. NI 9242 Getting Started Guide | © National Instruments | 25...

  • Page 27: High-Vibration Application Connections

    For 4-wire WYE-to-WYE (partial) configurations, delta-to-WYE configurations, and 3-wire WYE-to-WYE configurations, follow these guidelines for the best accuracy results. • Connect the Neutral terminal of the NI 9242 to the isolated ground of the potential transformer to reduce noise between the potential transformer ground and the chassis ground.
  • Page 28 Installing the NI 9967 Using 12 AWG to 14 AWG Wire What to Use • NI 9967 backshell • 12 AWG to 14 AWG wire • Smallest strain-relief piece • Screwdriver NI 9242 Getting Started Guide | © National Instruments | 27...
  • Page 29 What to Do 1. Route wires under the smallest strain-relief piece. 2. Secure the smallest strain-relief piece and the backshell in place using captive screws. 28 | ni.com | NI 9242 Getting Started Guide...
  • Page 30 Installing the NI 9967 Using 16 AWG Wire What to Use • NI 9967 backshell • 16 AWG wire • Small and large strain-relief pieces • Screwdriver NI 9242 Getting Started Guide | © National Instruments | 29...
  • Page 31 What to Do 1. Route wires between the two strain-relief pieces, with the small strain-relief piece on top of the wires and the large strain-relief piece underneath the wires. 2. Secure the strain-relief pieces and the backshell in place using captive screws. 30 | ni.com | NI 9242 Getting Started Guide...
  • Page 32 Installing the NI 9967 Using 18 AWG to 24 AWG Wire What to Use • NI 9967 backshell • 18 AWG to 24 AWG wire • Largest strain-relief piece • Screwdriver NI 9242 Getting Started Guide | © National Instruments | 31...
  • Page 33 What to Do 1. Route wires under the largest strain-relief piece. 2. Secure the largest strain-relief piece and the backshell in place using captive screws. 32 | ni.com | NI 9242 Getting Started Guide...
  • Page 34 To convert L-N measurements to L-Earth values, add the neutral channel reading to each AI channel reading. Refer to the following equation for an example of converting L-N measurements to L-Earth. Line to Earth = AIx + Neutral NI 9242 Getting Started Guide | © National Instruments | 33...
  • Page 35 where AIx is the analog input channel reading Neutral is the Neutral channel reading 34 | ni.com | NI 9242 Getting Started Guide...

  • Page 36: Where To Go Next

    NI 9242 Datasheet NI-RIO Help NI-DAQmx Help LabVIEW FPGA Help LabVIEW Help RELATED INFORMATION C Series Documentation Services & Resources ni.com/services ni.com/info cseriesdoc Located at ni.com/manuals Installs with the software NI 9242 Getting Started Guide | © National Instruments | 35...

  • Page 37: Worldwide Support And Services

    Worldwide Support and Services The NI website is your complete resource for technical support. At ni.com/support, you have access to everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers. ni.com/services Visit for NI Factory Installation Services, repairs, extended warranty, and other services.
  • Page 38 United States, visit the Worldwide Offices section of ni.com/niglobal to access the branch office websites, which provide up-to-date contact information, support phone numbers, email addresses, and current events. NI 9242 Getting Started Guide | © National Instruments | 37...
  • Page 39 U.S. Government Customers: The data contained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015. © 2016 National Instruments. All rights reserved. 376130D-01 Apr16...

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