Related Manuals for Obvius A90DC-12
Summary of Contents for Obvius A90DC-12
- Page 1 A90DC-12 – DC Current Monitor Obvius, LLC Installation and Operation Manual Model A90DC-12, A90DC-10 Date: Sep 4, 2013 Page 1 A90DC-12 – DC Current Monitor 1.800.561.8187 information@itm.com www. .com...
- Page 2 Obvius's authorized facilities; (4) has not been sold subject to other warranty terms specified at the time of sale; and (5) is still owned by the original purchaser. This warranty provides specific legal rights that may be varied by state law. Obvius's products are not designed for life or safety applications.
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Page 3: Table Of Contents
Table of Contents Markings and Symbols:................................3 Overview......................................4 Applications....................................4 Installation Checklist...................................4 Hardware Overview..................................5 A90DC-12, A90DC-10 Series Features and Specifications....................5 Power and Communication Connections..........................6 Hardware Installation................................6 Temperature...................................8 Monitoring usage:..................................9 AcquiSuite Advanced Configuration Options........................10 Modbus Features..................................11 Supported Modbus Functions..............................11 Modbus Register List................................11 Register formatting.................................14 Alarm configuration...............................14... -
Page 4: Overview
DC power supplies for telecom switch gear. The A90DC-12 uses 12 non-contact DC Hall Effect sensors to measure DC current on each of the 12 channels. DC current can be measured in both directions, showing positive and negative numbers in the resulting measurement values. Data values are made available via RS485 serial using the standard Modbus RTU protocol. -
Page 5: Hardware Overview
If the product is used in a manner not specified by the manufacture, the protection provided by the equipment may be impaired. Note: The A90DC-12 or A90DC-10 models are identical except for the number of DC current sensor channels present on the device. This manual will refer to model A90DC-12 however the manual covers installation and operation for all three models except where otherwise noted. -
Page 6: Power And Communication Connections
Step 1 - Unpack materials: Remove all materials from shipping box and verify all required components are available Step 2 - Mount the A90DC-12 inside the electrical enclosure. Be sure to provide enough room to route the load wires through the hall effect sensor openings. - Page 7 ● Step 7 - Set the Modbus Address. The default Modbus address of the A90DC-12 is set at the factory between 1 and 128, and is printed on the product packaging label. If other A90DC-12 devices are to be used in the system, you must verify the Modbus address on each is unique one to prevent two devices from having the same address.
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Page 8: Temperature
DO NOT CONNECT VOLTAGE OR CURRENT INPUTS LIVE Each DC load wire should be run through the opening in the A90DC-12 hall effect sensor. The I+ and I- on the side of the sensor indicates the direction of current flow. The I+ (label side) should point in the direction of the load. In a solar PV system, the I+ should point towards the inverter. -
Page 9: Monitoring Usage
When using the A90DC-12 with the AcquiSuite data acquisition server, the following configuration page will be presented. The AcquiSuite will display will report all the data values present on the A90DC-12. In addition, the long average value will be cleared after each logging interval. Also provided in the AcquiSuite display is the power supply voltage, and onboard pcb temperature. -
Page 10: Modbus Features
Modbus Features Supported Modbus Functions The A90DC-12 device responds to the following Modbus query functions: 0x11 Report slave id. 0x03 read holding registers (multiple) 0x06 preset single register These should be sufficient to perform all operations (read many values, make single change, and identify). In addition the device will respond to with Modbus exceptions for invalid function, value, and register if out of bound requests are made. - Page 11 Hardware Version (0x9012, 0x9010...) 1011 41012 UINT16 PCB Rev (0=rev A, etc) (low byte Part Rev) 1012 41013 UINT16 rw/nv Minimum current threshold for alarm feature, amps * 100. Page 12 A90DC-12 – DC Current Monitor 1.800.561.8187 information@itm.com www. .com...
- Page 12 (register 41017): This register clears the values for average, min, and max. The historical accumulation of samples for the average field will be cleared, and average, min, max will be set to the present instantaneous value after the next instantaneous value is recalculated. Page 13 A90DC-12 – DC Current Monitor 1.800.561.8187 information@itm.com www.
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Page 13: Register Formatting
The A90DC-12 provides features to detect alarm conditions related to Solar PV applications. For example, in a PV array, the system may have 10 pv panels wired in series per string, and 12 strings that run back to a combiner box. The A90DC-12 can be installed at the combiner box to monitor the current levels on all 12 strings at the same time. -
Page 14: Mechanical Drawings
Mechanical Drawings The A90DC-12 must be mounted inside an appropriate enclosure rated for the weather, location, and electrical components located inside it. The A90DC-12 mounting holes are detailed below. Page 15 A90DC-12 – DC Current Monitor 1.800.561.8187 information@itm.com www. .com... -
Page 15: A90Dc-12 Firmware Update
Step 10: Click the “Upload to Flash” button. The firmware update will start, and a blue progress bar will be shown across the bottom of the screen. While the upload is in progress, the green Alive LED on the A90DC-12 will stop blinking and stay on solid.