Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 62
Grounding Terminals, 1.3.4 Power Terminals
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Section 5. System Overview • Continuous Analog Output - available by adding a peripheral analog output device available from Campbell Scientific. Refer to the appendix CAO Modules (p. 563) for information on available output-expansion modules. 5.1.3.3 Grounding Terminals Read More! See Grounding (p. 86). Proper grounding will lend stability and protection to a data acquisition system. It is the easiest and least expensive insurance against data loss-and the most neglected. The following terminals are provided for connection of sensor and datalogger grounding: • Signal Grounds - 12 ground terminals ( ) used as reference for singleended analog inputs, pulse inputs, excitation returns, and as a ground for sensor shield wires. Signal returns for pulse inputs should use terminals located next to pulse inputs. • Power Grounds - 6 terminals (G) used as returns for 5V, SW-12, 12V, and C1 to C8 outputs. Use of G grounds for these outputs minimizes potentially large current flow through the analog voltage-measurement section of the wiring panel, which can cause single-ended voltage measurement errors. • Ground Lug - 1 large brass lug ( ), used to connect a heavy gage wire to earth ground. A good earth connection is necessary to secure the ground potential of the datalogger and shunt transients away from electronics. Minimum 14 AWG wire is recommended. 5.1.3.4 Power Terminals Read More! See Power Sources (p. 82). 5.1.3.4.1 Power In 5.1.3.4.2 Power Out Note Refer to the appendix Power Supplies (p. 564) for information on available power supplies. • External Power Supply - one green plug (POWER IN): for connecting power from an external power source to the CR1000. This is the only terminal used to input power; other 12V terminals and the SW-12 terminal are output only terminals for supplying power to other devices. Review power requirements and power supply options in Power Sources (p. 82) before connecting power. • See Powering Sensors and Devices (p. 84). • Peripheral 12 Vdc Power Source - 2 terminals (12V) and associated grounds (G) supply power to sensors and peripheral devices requiring nominal 12 Vdc. This supply may drop as low as 9.6 Vdc before datalogger operation stops. Precautions should be taken to minimize the occurrence of data from underpowered sensors. 62