Campbell DCDC18R User manual

DCDC18R
Boost Regulator
Revision
: 10/2021
Copyright ©
1999 – 2021
Campbell Scientific, Inc.

i
Table of Contents
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1. General Description................................................... 1
2. Specifications ............................................................ 1
3. Installation ................................................................. 2
4. Grounding .................................................................. 3
Figures
1-1. DCDC18R ............................................................................................1
3-1. Wiring for DCDC18R ..........................................................................2
3-2. DCDC18R on CR5000.........................................................................3
4-1. Schematic of Charging and Grounding Circuitry.................................4

1
DCDC18R Boost Regulator
1. General Description
The DCDC18R Boost regulator is intended to accept an 11 to 16 VDC input
and boost it to 18 VDC. Its main use is to boost automobile supply voltages to
the 17 VDC minimum required to charge the batteries in the CR3000, CR5000,
or CR23X LA bases. It can be conveniently bolted onto the side of the LA
base next to the charger input.
FIGURE 1-1. DCDC18R
Input Voltage: 11 to 16 VDC
Output Voltage: 18 V ±5%
Quiescent Current 4 mA
Maximum Output Current: 1 Amp
Maximum Input Current 2.25 Amps*
Power Conversion Efficiency 80 to 90%
Temperature Range: -40 to +60°C

DCDC18R Boost Regulator
2
This equipment has been tested and found to comply with the
limits for a Class A digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful 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.
*The slow start boost regulator typically starts to work at a supply voltage of
about 10 volts. Supply voltages below 10 volts pass directly to V out (through
2 Schottky diodes dropping the voltage by ~ 0.6 volts). With the DCDC18R
operating at the maximum output current (18 V * 1 A = 18 W) the input power
required is up to 18 W / 0.8 efficiency = 22.5 watts; that is the maximum
current specification of 2.25 Amps at 10 volts.
3. Installation
FIGURE 3-1. Wiring for DCDC18R
NOTE

DCDC18R Boost Regulator
3
FIGURE 3-2. DCDC18R on CR5000
The DCDC18R is installed near the datalogger, either on the side of the
datalogger (FIGURE 3-2) or to the back panel of the enclosure. The voltage
input is connected to 12 volts and ground from the supply source. The leads
from “V out” go to the charging input. The G lead from “V out” connects to
either charge input terminal and the 18 V lead connects to the other. The
polarity of the inputs does not matter.
4. Grounding
The datalogger must be grounded for its transient protection
to work. CONNECTIONS TO THE CHARGING INPUT DO
NOT PROPERLY GROUND THE DATALOGGER. The
Ground connection should be made at the grounding lug on
the wiring panel.
A full-wave bridge rectifier is included on the CR3000, CR5000, and CR23X
LA bases and the PS100. This creates a diode drop (0.7 V) between the
datalogger ground and the return side of the charging input (FIGURE 4-1). If
the datalogger ground (ground lug) and the return side of the charging input (G
terminal of the DCDC18R) are tied together through a wire, then the return
current to the DCDC18R will flow through this wire rather than through the
diode in the bridge rectifier. This is a valid connection and does not cause
CAUTION

DCDC18R Boost Regulator
4
measurement problems because the CR3000, CR5000, and CR23X have star
ground connection at the ground lug. However, unwanted ground loops that
induce single-ended measurement offsets will be generated if the ⏚terminals
and the return side of the charging input are tied together because the return
current to the DCDC18R will flow through the ⏚terminals.
FIGURE 4-1. Schematic of Charging and Grounding Circuitry

Limited Warranty
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Scientific to be free from defects in materials and workmanship under normal
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Refer to www.campbellsci.com/terms#warranty for more information.
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Assistance
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Safety
DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND
TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES,
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TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS
INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS.
CHECK WITH YOUR ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE
EQUIPMENT PRIOR TO PERFORMING ANY WORK.
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governing codes and regulations, including safety regulations, and the integrity and location of structures or land to which towers, tripods, and any
attachments are attached. Installation sites should be evaluated and approved by a qualified engineer. If questions or concerns arise regarding installation,
use, or maintenance of tripods, towers, attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.
General
•Protect from over-voltage.
•Protect electrical equipment from water.
•Protect from electrostatic discharge (ESD).
•Protect from lightning.
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governing structure-height regulations.
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Utility and Electrical
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constructing, using, or maintaining, or a tool, stake, or anchor, come in contact with overhead or
underground utility lines.
•Maintain a distance of at least one-and-one-half times structure height, 6 meters (20 feet), or the distance
required by applicable law, whichever is greater, between overhead utility lines and the structure (tripod,
tower, attachments, or tools).
•Prior to performing site or installation work, inform all utility companies and have all underground utilities
marked.
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•Only use power sources approved for use in the country of installation to power Campbell Scientific devices.
Elevated Work and Weather
•Exercise extreme caution when performing elevated work.
•Use appropriate equipment and safety practices.
•During installation and maintenance, keep tower and tripod sites clear of un-trained or non-essential
personnel. Take precautions to prevent elevated tools and objects from dropping.
•Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.
Maintenance
•Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks, frayed cables,
loose cable clamps, cable tightness, etc. and take necessary corrective actions.
•Periodically (at least yearly) check electrical ground connections.
Internal Battery
•Be aware of fire, explosion, and severe-burn hazards.
•Misuse or improper installation of the internal lithium battery can cause severe injury.
•Do not recharge, disassemble, heat above 100 °C (212 °F), solder directly to the cell, incinerate, or expose
contents to water. Dispose of spent batteries properly.
WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE
CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF
TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS,
ETC.

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