Campbell Scientific CR6 CR6 Measurement and Control System - Page 76
Grounding Terminals, 2.2.4 Power Terminals
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Section 5. System Overview 5.2.2.3 Grounding Terminals Read More See Grounding (p. 110). Proper grounding lends stability and protection to a data acquisition system. It is the easiest and least expensive insurance against data loss - and often the most neglected. The following terminals are provided for connection of sensor and CR6 datalogger grounds: • Signal Ground ( ) - reference for single-ended 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 the pulse input terminal. Current loop sensors, however, should be grounded to power ground. • Power Ground (G) - return for 5V, SW12, 12V, current loop sensors, and U or C configured for control. 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. • Resistive Ground (RG) - return for RS-485 connections. • Earth Ground Lug ( ) - connection point for a heavy-gage earth-ground wire. A good earth connection is necessary to secure the ground potential of the CR6 and shunt transients away from electronics. Minimum 14 AWG wire is recommended. 5.2.2.4 Power Terminals Reading List: • Power Supplies - Specifications (p. 100) • Power Supplies - Quickstart (p. 38) • Power Supplies - Overview (p. 81) • Power Supplies - Details (p. 104) • Power Supplies - Troubleshooting • Power Supplies - Lists (p. 607) 5.2.2.4.1 Power In The - BAT +- CHG + connector is the connection point for external power supply components. 5.2.2.4.2 Power Out Terminals Note Refer to the section Switched Voltage Output - Details (p. 107) for more information on using the CR6 as a power supply for sensors and peripheral devices. The CR6 can be used as a power source for sensors and peripherals. The following voltages are available: • 12V terminals: unregulated nominal 12 Vdc. This supply closely tracks the primary CR6 supply voltage, so it may rise above or drop below the power requirement of the sensor or peripheral. Precautions should be taken to prevent damage to sensors or peripherals from over- or under-voltage conditions, and to minimize the error associated with the measurement of 76