Campbell Scientific CR6 CR6 Measurement and Control System - Page 105
CR6 Power Requirement, Calculating Power Consumption, Power Sources
View all Campbell Scientific CR6 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 105 highlights
Section 7. Installation source, a charge controller, and a rechargeable battery. When ac line power is available, a Vac-to-Vdc wall adapter, the on-board charging regulator, and a rechargeable battery can be used to construct a UPS (un-interruptible power supply). Contact a Campbell Scientific application engineer if assistance in selecting a power supply is needed, particularly with applications in extreme environments. 7.4.1 CR6 Power Requirement The CR6 is fully operable with power from 10 to 16 Vdc applied to the -BAT+ terminals, or 16 to 32 Vdc applied to the -CHG+ terminals. Both sets of connectors are found on the green power plug in the upper right portion of the face of the wiring panel. Some functions, such as programming, the setting of settings, and analog measurement, are provided when 5 Vdc is supplied through the USB connection between the micro-B USB port and a PC. The CR6 is internally protected against accidental polarity reversal on the power inputs. A transient voltage suppressor (TVS) diode at the -BAT+ and -CHG+ terminals on the POWER IN (p. 38) connector provides protection from intermittent high voltages by clamping these transients to within the range of 19 to 21 V (-BAT+) and 40 V (-CHG+). Sustained input voltages in excess of 19 V or 40 V respectively, can damage the TVS diode. 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 -BAT+ terminals is 16 Vdc, the 12V and SW12 terminals, and pin 8 on the CS I/O port, will supply 15.7 Vdc (0.3 V less than main supply) to a connected peripheral. If the connected peripheral or sensor is not designed for that voltage level, it may be damaged. 7.4.2 Calculating Power Consumption Read More Power Supplies - Overview (p. 81). System operating time for batteries can be determined by dividing the battery capacity (ampere-hours) by the average system current drain (amperes). The CR6 typically has a quiescent current drain of