National Instruments NI-9244 User manual

NI-9244 Getting
Started
2022-07-06

Contents
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines for Hazardous Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electromagnetic Compatibility Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Special Conditions for Marine Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Preparing the Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
NI 9244 Pinout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connecting Phase Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Three-Phase Measurement Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting Single-Phase Measurement Configurations. . . . . . . . . . . . . . . . . . . . 10
Connection Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
High-Vibration Application Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Wiring the NI 9969. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Converting L-N Measurements to L-Earth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Converting L-N Measurements to L-L. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Where to Go Next. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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NI-9244 Getting Started

Overview
This document explains how to connect to the NI-9244.
Note Before you begin, read the NI-9244 Safety, Environmental, and
Regulatory Information document on ni.com/manuals and complete the
soware and hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to the NI-9244. The
other components in the system might not meet the same safety ratings.
Refer to the documentation for each component in the system to
determine the safety and EMC ratings for the entire system.
Safety Guidelines
Caution Observe all instructions and cautions in the user documentation.
Using the product in a manner not specified can damage the product and
compromise the built-in safety protection.
Attention Suivez toutes les instructions et respectez toutes les mises
en garde de la documentation d'utilisation. L'utilisation du produit de
toute autre façon que celle spécifiée risque de l'endommager et de
compromettre la protection de sécurité intégrée.
Safety Voltages
Connect only voltages that are within the following limits.
Maximum working voltage, channel-to-earth ground
Up to 2,000 m altitude
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NI-9244 Getting Started

Continuous 400 Vrms, Measurement Category III
Up to 5,000 m altitude
Continuous 400 Vrms, Measurement Category II or 300 Vrms,Measurement Category III
Division 2 and Zone 2 hazardous locations applications
Channel-to-earth ground 300 Vrms, Measurement Category III
Safety Guidelines for Hazardous Voltages
If hazardous voltages are connected to the product, take the following precautions.
A hazardous voltage is a voltage greater than:
■ 30 V RMS, 42.4 V peak, or 60 V DC in DRY LOCATIONS
■ 16 V RMS, 22.6 V peak, or 35 V DC in WET LOCATIONS
Caution Ensure that hazardous voltage wiring is performed only by
qualified personnel adhering to local electrical standards.
Attention S'assurer que le câblage à tension dangereuse est eectué par
du personnel qualifié respectant les normes électriques locales.
Caution Do not mix hazardous voltage circuits and human-accessible
circuits on the same product.
Attention Ne pas combiner des circuits avec des tensions dangereuses et
des circuits accessibles aux personnes sur le même produit.
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NI-9244 Getting Started

Caution When product terminals are hazardous voltage LIVE, you must
ensure that devices and circuits connected to the product are properly
insulated from human contact.
Attention Lorsqu'une haute tension dangereuse est appliquée aux
bornes du produit, vous devez vous assurer que les appareils et les circuits
auxquels il est connecté sont correctement isolés de tout contact humain.
Caution You must use the NI 9969 connector backshell kit to ensure that
the terminals are not accessible.
Safety Guidelines for Hazardous Locations
The NI-9244 is suitable for use in Class I, Division 2, Groups A, B, C, D, T4 hazardous
locations; Class I, Zone 2, AEx nA IIC T4 Gc and Ex nA IIC T4 Gc hazardous locations;
and nonhazardous locations only. Follow these guidelines if you are installing the
NI-9244 in a potentially explosive environment. Not following these guidelines may
result in serious injury or death.
Caution Do not disconnect I/O-side wires or connectors unless power has
been switched o or the area is known to be nonhazardous.
Caution Do not remove modules unless power has been switched o or
the area is known to be nonhazardous.
Caution Substitution of components may impair suitability for Class I,
Division 2, or Zone 2.
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NI-9244 Getting Started

Caution The system must be installed in an enclosure certified for the
intended hazardous (classified) location, having a tool secured cover/door,
where a minimum protection of at least IP54 is provided.
Special Conditions for Hazardous Locations Use in Europe and
Internationally
The NI-9244 has been evaluated as Ex nA IIC T4 Gc equipment under
DEMKO 12ATEX 1202658X and is IECEx UL 14.0089X certified. Each NI-9244 is marked
II 3G and is suitable for use in Zone 2 hazardous locations, in ambient
temperatures of -40 °C ≤ Ta ≤ 70 °C. If you are using the NI-9244 in Gas Group IIC
hazardous locations, you must use the device in an NI chassis that has been
evaluated as Ex nC IIC T4, Ex IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
Caution The system shall only be used in an area of not more than
Pollution Degree 2, as defined in IEC/EN 60664-1.
Caution The system shall be mounted in an ATEX/IECEx-certified
enclosure with a minimum ingress protection rating of at least IP54 as
defined in IEC/EN 60079-15.
Caution The enclosure must have a door or cover accessible only by the
use of a tool.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory requirements and limits
for electromagnetic compatibility (EMC) stated in the product specifications. These
requirements and limits provide reasonable protection against harmful interference
when the product is operated in the intended operational electromagnetic
environment.
This product is intended for use in industrial locations. However, harmful
interference may occur in some installations, when the product is connected to a
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NI-9244 Getting Started

peripheral device or test object, or if the product is used in residential or
commercial areas. To minimize interference with radio and television reception and
prevent unacceptable performance degradation, install and use this product in strict
accordance with the instructions in the product documentation.
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.
Special Conditions for Marine Applications
Some products are approved for marine (shipboard) applications. To verify marine
approval certification for a product, visit ni.com/product-certifications, search by
model number, and click the appropriate link.
Notice In order to meet the EMC requirements for marine applications,
install the product in a shielded enclosure with shielded and/or filtered
power and input/output ports. In addition, take precautions when
designing, selecting, and installing measurement probes and cables to
ensure that the desired EMC performance is attained.
Preparing the Environment
Ensure that the environment in which you are using the NI-9244 meets the following
specifications.
Operating temperature (IEC 60068-2-1, IEC 60068-2-2) -40 °C to 70 °C
Operating humidity (IEC 60068-2-30) 10% RH to 90% RH, noncondensing
Pollution Degree 2
Maximum altitude 5,000 m
Indoor use only.
Note Refer to the NI-9244 Specifications on ni.com/manuals for
complete specifications.
© National Instruments 7
NI-9244 Getting Started

NI 9244 Pinout
AI0
AI1
AI2
Neutral
0
1
2
3
Signal Description
AI Analog input signal connection referenced to the Neutral signal
Neutral Referenced, single-ended analog input connection
Table 1. Signal Descriptions
Connecting Phase Measurements
The NI-9244 accepts three-phase and single-phase measurement configuration.
Three-Phase Measurement Configurations
NI recommends the following three-phase connection types.
4-Wire WYE Measurement Configuration
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NI 9244
AI0
Phase A
Phase B
Phase C
Neutral Neutral
AI2
AI1
High-Leg Delta Measurement Configuration
NI 9244
AI0
Phase A
Phase B
Phase C
Neutral
AI2
AI1
Neutral
3-Wire Delta Measurement Configuration
NI 9244
AI0
Phase A
Phase B
Phase C AI2
AI1
Corner Grounded 2-Wire Delta Measurement Configuration
© National Instruments 9
NI-9244 Getting Started

NI 9244
AI0
Phase A
Phase B
Phase C AI2
AI1
The 9244 cannot measure the entire tolerance range or high crest factor signals on
690 Vrms systems in this configuration.
Connecting Single-Phase Measurement Configurations
NI recommends the following single-phase connection types.
3-Wire Measurement (Split Phase) Configuration
NI 9244
AI0
Neutral
AI1
2-Wire Measurement
NI 9244
AI0
Neutral
Connection Guidelines
■ You must use 2-wire ferrules to create a secure connection when connecting
more than one wire to a single terminal on the NI-9244.
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■ Make sure that devices you connect to the NI-9244 are compatible with the
module specifications.
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.
High-Vibration Application Connections
If your application is subject to high vibration, NI recommends that you follow these
guidelines to protect connections to the NI-9244:
■Use ferrules to terminate wires to the detachable connector.
■Use the NI 9969 connector backshell kit.
Wiring the NI 9969
Caution For safe operation with hazardous voltages, you must use the
NI 9969 Connector Backshell with the 4-terminal connector on the NI-9244.
Complete the appropriate procedure for each wire gauge.
Installing the NI 9969 Using 12 AWG to 14 AWG Wire
What to Use
■ NI 9969 backshell
■12 AWG to 14 AWG wire
■Smallest strain-relief piece
■Screwdriver
What to Do
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NI-9244 Getting Started

1
2
1. Route wires under the smallest strain-relief piece.
2. Secure the smallest strain-relief piece and the backshell in place using captive
screws.
Installing the NI 9969 Using 16 AWG Wire
What to Use
■ NI 9969 backshell
■16 AWG wire
■Small and large strain-relief pieces
■Screwdriver
What to Do
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NI-9244 Getting Started

1
2
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.
Installing the NI 9969 Using 18 AWG to 24 AWG Wire
What to Use
■ NI 9969 backshell
■18 AWG to 24 AWG wire
■Largest strain-relief piece
■Screwdriver
What to Do
© National Instruments 13
NI-9244 Getting Started

1
2
1. Route wires under the largest strain-relief piece.
2. Secure the largest strain-relief piece and the backshell in place using captive
screws.
Converting L-N Measurements to L-Earth
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
where
■AIx is the analog input channel reading
■Neutral is the Neutral channel reading
Converting L-N Measurements to L-L
To convert L-N measurements to L-L values, calculate the voltage dierence
between the AI channels using your application soware.
Refer to the following equation for an example of converting L-N measurements to
L-L.
Phase A to Phase B Voltage = AI0 - AI1
where
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NI-9244 Getting Started

■AI0 is the reading from Phase A
■AI1 is the reading from Phase B
Where to Go Next
NI Services
Visit ni.com/support to find support resources including documentation,
downloads, and troubleshooting and application development self-help such as
tutorials and examples.
Visit ni.com/services to learn about NI service oerings such as calibration options,
repair, and replacement.
Visit ni.com/register to register your NI product. Product registration facilitates
technical support and ensures that you receive important information updates from
NI.
NI corporate headquarters is located at 11500 N Mopac Expwy, Austin, TX,
78759-3504, USA.
© National Instruments 15
NI-9244 Getting Started
© 2022 National Instruments Corporation.