Section 7. Installation
7.2 Power Supplies — Details
Related Topics:
• Power Input Terminals — Specifications
• Power Supplies — Quickstart
(p. 37)
• Power Supplies — Overview (p. 83)
• Power Supplies — Details (p. 94)
• Power Supplies — Products (p. 576)
• Power Sources (p. 95)
• Troubleshooting — Power Supplies (p. 477)
Reliable power is the foundation of a reliable data acquisition system. When
designing a power supply, consideration should be made regarding worst-case
power requirements and environmental extremes. For example, when designing a
solar power system, design it to operate with 14 days of reserve time at the winter
solstice when the following are limiting environmental factors:
• Sunlight intensity is the lowest
• Sunlight duration is the shortest
• Battery temperatures are the lowest
• System power requires are often the highest
The CR800 is internally protected against accidental polarity reversal on the
power inputs.
The CR800 has a modest-input power requirement. For example, in low-power
applications, it can operate for several months on non-rechargeable batteries.
Power systems for longer-term remote applications typically consist of a charging
source, a charge controller, and a rechargeable battery. When ac line power is
available, a Vac-to-Vac or Vac-to-Vdc wall adapter, a peripheral charging
regulator, and a rechargeable battery can be used to construct a UPS (un-
interruptible power supply).
Caution Voltage levels at the 12V and switched SW12 terminals, and pin
8 on the CS I/O port, are tied closely to the voltage levels of the main
power supply. For example, if the power received at the POWER IN 12V
and G terminals is 16 Vdc, the 12V and SW12 terminals, and pin 8 on
the CS I/O port, will supply 16 Vdc to a connected peripheral. If the
connected peripheral or sensor is not designed for that voltage level, it
may be damaged.
7.2.1 CR800 Power Requirement
The CR800 operates with power from 9.6 to 16 Vdc applied at the POWER IN
terminals of the green connector on the face of the wiring panel.
The CR800 is internally protected against accidental polarity reversal on the
power inputs. A transient voltage suppressor (TVS) diode at the POWER IN 12V
To Next Page
Loading...
Need help?
General
