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Summary of Contents for Azbil NWA300
- Page 1 OM2-5190-0920 Field-Based Analog 4 - 20mA DC Current Meter Model NWA300 User's Manual...
- Page 2 In no event shall Azbil Corporation be liable to anyone for any indirect, special or consequential damages. This information and specifications in this document are subject to change without notice.
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Page 3: Table Of Contents
Table of Contents General Precautions Chapter 1 Configuration And Structure Of NWA Current Indication System 1-1 System Configuration 1-2 Notes on the Explosion-proof NWA 1-3 Structure and Function Structure Main Unit Indicator Terminal Box Chapter 2 Installation 2-1 Before Installation Mounting Environment 2-2 Installation Mounting... -
Page 5: General Precautions
Inquiries If you find errors in the specification, or have any questions regarding the specifications, please contact the azbil Group sales office. In this case be sure to inform us of the NWA Tag and Product Numbers. Notes on Storage When storing the NWA before installation, pay attention to the following: –... -
Page 6: Chapter 1 Configuration And Structure Of Nwa Current Indication System
Chapter 1. Configuration And Structure Of NWA Current Indication System Overview This chapter introduces the configuration of the NWA current indication system, and includes: – The structure of the NWA main unit, with the names and functions of each section. –... -
Page 7: Notes On The Explosion-Proof Nwa
1-2. Notes on the Explosion-proof NWA Overview The NWA explosion-proof model is certified to comply with Japan’s Industrial Safety and Health Laws, and can thus be used in dangerous locations. For proper use, the following guidelines must be followed. Pressure-Resistant, Explosion-proof Structure The pressure-resistant and explosion-proof structure is totally sealed, which contains possible internal explosions, and prevents ignition of external explosive gases. - Page 8 “Recommended Practice for Explosion-Protected Installations in General Industries”, published by Japan’s Ministry of Labor’s Research Institute for Industrial Safety. For cable installation, be sure to attach the standard Azbil Corporation pressure-resistant packing cable adapter to the wiring port of the terminal box.
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Page 9: Structure And Function
1-3. Structure and Function Structure Major components The NWA analog meter consists of the main unit indicator and the terminal box, as shown below. Fig 1-3 General View of the NWA... - Page 10 Names and Functions of each Section The following table shows the name and function of each section of the NWA. <Name> <Function> Main unit indicator Receives analog signal from the transmitter and indicates values Terminal box Accommodates input signal terminals Fastening screw for explosion- For explosion-proof model, be sure to fasten this screw proofing...
- Page 11 Fig 1-4 General View of the Pressure-Resistant Packing Cable Adapter Fig 1-5 Assemblies of the Pressure-Resistant Packing Cable Adapter...
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Page 12: Main Unit Indicator
Main Unit Indicator Description The functions and structure of the main unit indicator are as follows: – Receives analog signal from the transmitter and indicates values Name of each Section The following shows the name of each section of the main unit indicator. Fig 1-6 Main Unit Indicator Detail Function of each section The following table shows the function of each section of the main unit indicator. -
Page 13: Terminal Box
Terminal Box Description The terminal box is provided with output signal terminals. Name of section The following shows the name of each section of the terminal box. Fig 1-7 Terminal Box Detail... - Page 14 Function of each section The following table shows the function of each section of the terminal box: <Name> <Function> Input signal terminal M+ or M- is indicated. Unconnected terminals These terminals are not normally used. They are used as relay terminals when multiple NWA meters are connected.
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Page 15: Chapter 2 Installation
Chapter 2. Installation Overview This chapter covers the mounting and the electrical installation procedures for the NWA meter, which differ according to whether or not the transmitter is provided with an output terminal for external meters, and to whether one or multiple NWAs are used. It covers: –... -
Page 16: Installation Mounting
2-2. Installation Mounting Procedure Follow the steps below: Step Procedure Attach the bracket using the four bracket mounting holes at the back of the main unit. (See Fig. 2-1.) Using the mounted bracket, secure the main unit to the 2B pipe vertically or horizontally with a U bolt. - Page 17 Fig 2-2 NWA Analog Meter Mounted on 2” Pipe...
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Page 18: Wiring
2-3. Wiring Overview This subsection covers the following items regarding electrical installation of the NWA: – Cable connection position – Cable selection and installation – Wiring procedure Caution Avoid connecting the NWA to commercial power. Otherwise, the internal measurement circuit may be irrevocably damaged. Connection position The following shows the terminal block of the terminal box: Fig 2-3 Terminal Block... - Page 19 Cable selection Twisted 600 V vinyl sheath lead CVV (JIS C3401) with a cross section of 2 mm , or equivalent, is recommended. For wiring in locations subject to electrical noise, shielded leads are recommended. The cable is connected to the terminal box through the conduit jointer (G1/2 female screw). The optimum diameter of the cable is φ11.
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Page 20: Wiring When Only One Nwa Is Used
Wiring when only one NWA is used When the transmitter is provided with an output signal terminal for external meters <Case 1> Notes: Don’t remove a jumper board on the terminal board (M+ and M-). <Case 2> Notes: Don’t remove a jumper board on the terminal board (M+ and M-). - Page 21 When the transmitter is not provided with an output signal terminal for external meters Notes: Don’t remove a jumper board on the terminal board (M+ and M-).
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Page 22: Wiring When Multiple Nwas Are Used
Wiring when multiple NWAs are used Notes on using multiple NWAs – Internal resistance of the NWA is 10 ohms. – Determine the number of NWAs to be used, taking the loop voltage and internal impedance of each device into account. When the transmitter is provided with an output signal terminal for external meter. -
Page 23: Wiring For The Pressure-Resistant, Explosion-Proof Model
– Lock both the main unit cover and the terminal cover at the same time. (See Fig. 2-4.) – As products from Azbil Corporation employ a pressure-resistant packing system, pressure- resistant packing is required for cable installation in areas requiring explosion and pressure- resistance. -
Page 25: Chapter 3 Nwa Operation
Chapter 3. NWA Operation Overview This chapter discusses initial start-up of the NWA. Read this chapter when activating the NWA for the first time. 3-1. Start-up Procedure Step Description Make sure that wiring for the NWA is completed. Make sure that notes and cautions regarding use of the NWA have been fully observed. - Page 28 Warranty period and warranty scope 1.1 Warranty period Azbil Corporation’s products shall be warranted for one (1) year from the date of your purchase of the said products or the delivery of the said products to a place designated by you.
- Page 29 Although acceleration of the above situation varies depending on the conditions or environment of use of the products, you are required not to use any Azbil Corporation’s products for a period exceeding ten (10) years unless otherwise stated in specifications or instruction manuals.
- Page 31 Document Number: OM2-5190-0920 Document Name: Field-Based Analog 4 - 20mA DC Current Meter Model NWA300 User's Manual Date: 1st edition: Sep 1994 3rd edition: Jan 2020 Issued/Edited by:...
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