National Instruments NI 9246 User manual

NI-9246

GETTING STARTED GUIDE
NI 9246
3-Channel, 20 Arms Continuous, 24-Bit, Analog
Input Module

This document explains how to connect to the NI 9246.
Note Before you begin, complete the software and
hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to
the NI 9246. 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
Operate the NI 9246 only as described in this document.
Caution Do not operate the NI 9246 in a manner not
specified in this document. Product misuse can result in
a hazard. You can compromise the safety protection
built into the product if the product is damaged in any
way. If the product is damaged, return it to NI for
repair.
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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.
Caution Ensure that hazardous voltage wiring is
performed only by qualified personnel adhering to local
electrical standards.
Caution Do not mix hazardous voltage circuits and
human-accessible circuits on the same module.
Caution Ensure that devices and circuits connected to
the module are properly insulated from human contact.
Caution When module terminals are hazardous
voltage LIVE (>42.4 Vpk/60 VDC), you must ensure
that devices and circuits connected to the module are
properly insulated from human contact.
NI 9246 Getting Started Guide | © National Instruments | 3

Safety Voltages
Connect only voltages that are within the following limits:
Maximum working voltage,
channel-to-earth ground
Continuous
...........................................
Up to 2,000 m
altitude
300 Vrms, Measurement
Category III
...........................................Up to 5,000 m
altitude
150 Vrms, Measurement
Category III or 300 Vrms,
Measurement Category II
Maximum working voltage,
channel-to-channel
Continuous
...........................................
Up to 2,000 m
altitude
480 Vrms, Measurement
Category III
...........................................Up to 5,000 m
altitude
300 Vrms, Measurement
Category III or 480 Vrms,
Measurement Category II
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Withstand
...................................................Channel-to-channel 3510 Vrms, verified by a 5 s
dielectric withstand test
...................................................Channel-to-earth
ground
3510 Vrms, verified by a 5 s
dielectric withstand test
Measurement Category II is for measurements performed on
circuits directly connected to the electrical distribution system.
This category refers to local-level electrical distribution, such as
that provided by a standard wall outlet, for example, 115 V for
U.S. or 230 V for Europe.
Measurement Category III is for measurements performed in the
building installation at the distribution level. This category refers
to measurements on hard-wired hardware such as hardware in
fixed installations, distribution boards, and circuit breakers. 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.
Caution Do not connect the NI 9246 to signals or use
for measurements within Measurement Category IV.
NI 9246 Getting Started Guide | © National Instruments | 5

Caution The NI 9246 ships with a connector
backshell to ensure that the terminals are not
accessible. Do not operate the device without first
installing this backshell.
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Figure 1. NI 9246 with Backshell
Related Information
Installing the NI 9246 Backshell on page 14
NI 9246 Getting Started Guide | © National Instruments | 7

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 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.
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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.
Caution 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.
NI 9246 Getting Started Guide | © National Instruments | 9

Preparing the Environment
Ensure that the environment in which you are using the NI 9246
meets the following specifications.
...........................................................Operating temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 70 °C
...........................................................Operating humidity
(IEC 60068-2-78)
10% RH to 90% RH,
noncondensing
...........................................................Pollution Degree 2
...........................................................Maximum altitude 5,000 m
Indoor use only.
Note Refer to the device datasheet on ni.com/manuals
for complete specifications.
Connecting the NI 9246
The NI 9246 provides connection for three analog input channels.
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Figure 2. NI 9246 Pinout
AI0+
AI1+
AI2+
AI1-
AI0-
AI2-
Note The NI 9246 does not measure DC currents.
Caution Connecting a DC current source to the
NI 9246 outside of the specifications stated in the
NI 9246 Datasheet may lead to invalid measurements.
NI 9246 Getting Started Guide | © National Instruments | 11

Refer to the datasheet on ni.com/manuals for the
NI 9246 specifications.
Connecting Cables Using Ring Lug Connectors
Complete the following steps to connect cables using ring lug
connectors. Use 5.26 mm2 (10 AWG) cables.
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Figure 3. Installing Cables
1
2
1. Align the cables with the device terminals.
2. Secure the cables using the ring lug screws. Tighten the screws to 1.36
N · m (12 lb · in.) torque.
NI 9246 Getting Started Guide | © National Instruments | 13

Installing the NI 9246 Backshell
Complete the following steps to install the NI 9246 backshell.
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Figure 4. Connector Backshell Installation
1
2
1. Align the backshell components with the device terminals.
2. Secure the backshell using the captive screws. Tighten to 0.45 N · m (4
lb · in.) torque.
NI 9246 Getting Started Guide | © National Instruments | 15

Connecting Phase Measurements
You can connect three-phase measurement configurations and
single-phase measurement configurations to the NI 9246.
You can connect a current source to the NI 9246 for single-phase
measurements. For grounded current sources, connect to the
chassis ground.
Figure 5. Connecting a Grounded or Floating Current Source
NI 9246
AI–
AI+
For three-phase measurements, connect three current sources to
the NI 9246.
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High-Vibration Applications
Proper strain relief of 5.26 mm2 (10 AWG) cable is required to
meet the shock and vibration performance specifications stated in
the NI 9246 Datasheet on ni.com/manuals. Strain relieve all
cabling as close to the chassis mounting plate as possible to
reduce the stresses exerted on the module. Ensure that you do not
directionally bias the module when applying strain relief.
NI 9246 Getting Started Guide | © National Instruments | 17

Where to Go Next
Located at ni.com/manuals Installs with the software
CompactRIO NI CompactDAQ
RELATED INFORMATION
NI 9246 Datasheet
NI-RIO Help
LabVIEW FPGA Help
NI 9246 Datasheet
NI-DAQmx Help
LabVIEW Help
C Series Documentation
& Resources
ni.com/info cseriesdoc
Services
ni.com/services
18 | ni.com | NI 9246 Getting Started Guide

Worldwide Support and Services
The National Instruments 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.
Visit ni.com/services for NI Factory Installation Services, repairs,
extended warranty, and other services.
Visit ni.com/register to register your National Instruments
product. Product registration facilitates technical support and
ensures that you receive important information updates from NI.
A Declaration of Conformity (DoC) is our claim of compliance
with the Council of the European Communities using the
manufacturer’s declaration of conformity. This system affords the
user protection for electromagnetic compatibility (EMC) and
product safety. You can obtain the DoC for your product by
visiting ni.com/certification. If your product supports calibration,
you can obtain the calibration certificate for your product at
ni.com/calibration.
NI 9246 Getting Started Guide | © National Instruments | 19