Campbell Scientific CR5000 CR5000 Measurement and Control Module - Page 34
Controlling Power to Sensors and Peripherals, Table 1.8-1, Current Sourcing Limits
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Section 1. Installation and Maintenance Table 1.8-1 Current Sourcing Limits Terminals Current Source Limit SW12 < 900 mA @ 20°C < 729 mA @ 40°C < 630 mA @ 50°C < 567 mA @ 60°C < 400 mA @ 80°C 12V + SW12 < 1.85 A @ 20°C < 1.50 A @ 40°C < 1.30 A @ 50°C < 1.17 A @ 60°C < 0.85 A @ 80°C 5V + CSI/O < 200 mA Make certain that the primary source of power for the CR5000 can sustain the current drain for the period of time required. Contact a CSI applications engineer for help in determining a power budget for applications that approach the limits of a given power supply's capabilities. Be particularly cautious about any application using solar panels and cellular telephone or radio, applications requiring long periods of time between site visits, or applications at extreme temperatures. TABLE 1.8-2. Typical Current Drain for Some CR5000 Peripherals Peripheral AM25T COM100 COM200 Phone Modem SDM-INT8 Typical Current Drain (mA) Quiescent .5 .5 0.0012 0.4 Active 1 1.8 140 6.5 1.9 Controlling Power to Sensors and Peripherals Controlling power to an external device is a common function of the CR5000. Many devices can conveniently be controlled with the SW-12 (Switched 12 Volt) terminals on the CR5000. Table 1.8-1 shows the current available from SW-12 port. Applications requiring more control channels or greater power sourcing capacity can usually be satisfied with the use of Campbell Scientific's A21REL-12 Four Channel Relay Driver, A6REL-12 Six Channel Relay Driver, SDM-CD16AC 16 Channel AC/DC Relay Module, or by using the control (C1-C8) ports as described in Section 1.9.1 1-10