A89DC-08 – DC Current Monitor
Obvius, LLC
Installation and Operation Manual
Model A89DC-08
Date Jun 21, 2010
Page 1 A89DC-08 – DC Current Monitor
Copyright Information
Copyright © 2007 - 2010 by Obvius
Obvius, AcquiSuite and ModHopper are trademarks of Obvius Holdings LLc
Other brand and product names are trademarks or registered trademarks of their respective holders.
U.S. Government Restricted Rights: Use, duplication or disclosure by the Government is subject to restrictions set fourth in subparagraph (a) through
(d) of the Commercial Computer Restricted Rights clause at FAR 52.227-19 when applicable, or subparagraph (c) (1) (ii) of the Rights in Technical Data
and Computer Software clause at DFARS 252.227-7013, and in similar clauses in the NASA FAR Supplement.
Limited Warranty
OBVIUS IS PROVIDING THIS WARRANTY IN LIEU OF ALL OTHER EXPRESS OR IMPLIED WARRANTIES, INCLUDING ANY WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. THIS WARRANTY IS BUYER'S EXCLUSIVE REMEDY FOR ALL
CLAIMS AGAINST OBVIUS. OBVIUS SHALL NOT BE LIABLE FOR ANY CONSEQUENTIAL OR INCIDENTAL DAMAGES. OBVIUS'S TOTAL
LIABILITY FOR ALL CLAIMS SHALL BE LIMITED TO THE PRICE PAID FOR ITS PRODUCT.
Obvius promises buyer that any standard product manufactured by Obvius shall be free from all material defects in design, material, or manufacturing for
a period of 2 years from the manufacture date; provided, however, that the warranty shall not extend to ordinary wear and tear or to normally replaceable
components (e.g., batteries). During the warranty period, Obvius may repair or replace (in its sole discretion) any product suffering from a warranty defect
and returned freight prepaid by buyer, with no charge to buyer for any warranty repair or replacement. The warranty shall remain in full force and effect
for such 2 year period, provided that the product: (1) was installed, operated, and maintained properly; (2) has not been abused or misused; (3) has not
been repaired, altered, or modified outside of 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.
Product Application Limitation
Obvius strongly believes in continuous improvement, therefore we must reserve the right to change specifications and product offerings without notice.
Where possible, we will substitute products with equivalent functionality when necessary.
DANGER
Hazard of Electric Shock, Explosion or Arc Flash
● Follow safe electrical work practices. See NFPA 70E in the USA, or applicable local codes.
● This equipment must only be installed and serviced by qualified electrical personnel.
● Read, understand and follow the instructions before installing this product.
● Turn off all power supplying equipment before working on or inside the equipment. Use properly rated voltage sensing device to
confirm power is off. DO NOT DEPEND ON THIS PRODUCT FOR VOLTAGE INDICATION
● Only install this product on insulated conductors.
Failure to follow these instructions will result in death or serious injury.
NOTICE
● This product is not intended for life safety applications.
● Do not install this product in hazardous or classified locations.
● The installer is responsible for conformance to all applicable codes.
● Mount this product inside a suitable fire and electrical enclosure.
FCC Part 15 Information
Note: This equipment has been tested by the manufacturer and found to comply with the limits of a class A digital device, pursuant to part
15 of the FCC rules. These limits are designed to provide reasonable protection against interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
Modifications of this product without the express authorization of Obvius nullify this statement.
Obvius
3300 NW 211th Terrace
Hillsboro, OR 97007
ph: 503-601-2099
www.obvius.com
Page 2 A89DC-08 – DC Current Monitor
Table of Contents
Markings and Symbols:...............................................................................................................................................................3
Overview......................................................................................................................................................................................4
Applications.................................................................................................................................................................................4
Installation Checklist...................................................................................................................................................................4
Hardware Overview.....................................................................................................................................................................5
A89DC-08 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.........................................................................................................................................................12
Alarm configuration.......................................................................................................................................................13
Mechanical Drawings................................................................................................................................................................14
Forced Air Cooling Application Note:......................................................................................................................................14
A89DC-08 Firmware Update.....................................................................................................................................................15
Markings and Symbols:
WARNING: A potential risk exists if the operating instructions are not followed
General Warning Symbol: This symbol indicates the need to consult the operating instructions provided with the
product.
This symbol indicates the presence of electric shock hazards.
This symbol indicates: Do not apply to or remove from hazardous live conductors.
Direct Current symbol.
Page 3 A89DC-08 – DC Current Monitor
Overview
The A89DC-08 DC current monitor system is designed to allow measurement and alarming of DC current applications
including solar pv arrays, battery monitoring and DC power supplies for telecom switch gear.
The A89DC-08 uses 8 non-contact DC Hall Effect sensors to measure DC current on each of the 8 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.
In addition to reporting the current values of each channel, the A89DC-08 also provides alarm functions to monitor
imbalances between channels. This feature is instrumental in detecting failed equipment in applications such as Solar PV
arrays.
Applications
The A89DC-08 DC Current Monitor has several applications. These include:
● DC Load Monitoring.
● Solar PV Power Generation
● Battery Charge and Discharge monitoring.
Installation Checklist
An A89DC-08 system installation has the following components:
Required hardware
● A89DC-08 DC current monitor (required)
● 24VDC power supply
● Data connection to a Modbus master device such as an AcquiSuite, ModHopper, PLC or computer software such as
the Obvius Config Console.
● Enclosure for the A89DC-08 DC to satisfy UL safety requirements.
● Shielded twisted pair wire for communications.
Note: If using the Obvius Config Console software, an RS232/DB9 or RS48555 serial cable will be required to attach the
A89DC-08 to the computer.
Page 4 A89DC-08 – DC Current Monitor
Hardware Overview
A89DC-08 Features and Specifications
Processor Arm7 embedded CPU
LED Alive (green), RS485 TX, RX (yellow)
Protocol Modbus RTU
Addressing Modbus address may be set from 1 to 247 via Modbus register.
Power Supply Power input : 24vdc at 382mA.
2
Inputs
Accuracy +/- 1% of full scale (+/- 0.5A)
Measurements DC current per channel, instantaneous and average
Alarming Low alarm may set as a percent of DC average of other channels.
Communications
Isolation The RS485 terminals electrically isolated to 1500V from the remainder of the A89DC-08 board.
Environmental
2
Safety UL61010 Recognized
EMC FCC CFR 47 Part 15, Class A
Size 10.25” x 2.5” x 1.75” (260mm x 64mm x 45mm)
Mass 0.83 lbs (0.375 kg)
(power supply not included)
8 DC Hall Effect Sensors, non-contact.
Maximum range +50Amps to -50Amps DC at 600vdc
The Hall Effect sensor openings are intended to be used with Insulated wire.
Cat I measurement device
4
0.49 inch by 0.35 inch opening for load wire.
Total DC current (sum of 8 channels), instantaneous and average
Average DC current (of 8 channels), instantaneous and average
Alarms may be disabled below a minimum average current level.
Minimum time for alarm may be set to prevent alarms on brief events.
Unused channels may be disabled to exclude them from total and average calculations.
1
RS-485 (+,-, S), 9600 baud, N, 8, 1, two wire. Supports up to 32 external devices (expandable)
North America: Temperature 0º – 60ºc 3, 0 – 95% humidity, non-condensing.
Pollution Degree 2, Altitude up to 2000M.
For indoor and outdoor use when used in an appropriate enclosure.
The A89DC-08 must be mounted inside a NEMA rated electrical enclosure for safety and isolation
requirements.
File: E320540 (Model A89DC-08)
1
Outputs are intended for low voltage class 2 inputs.
2
If the product is used in a manner not specified by the manufacture, the protection provided by the equipment may be
impaired.
3
May be dependent on forced air cooling. See chapter on temperature in this manual for details.
WARNING:
Page 5 A89DC-08 – DC Current Monitor
4
Not for use within measurement categories II, III or VI
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