Campbell CR800 Spezifikationen PDF herunterladen (Seite 61)

Section 1. Installation and Maintenance

1-9

Examples:

1. Connect 5 Volt, 12 Volt, and control grounds to G terminals.

2. Connect excitation grounds to the closest

terminal on the excitation

terminal block.

3. Connect the low side of single-ended sensors to the nearest

terminal on

the analog input terminal blocks.

4. Connect shield wires to the nearest

terminal on the analog input

terminal blocks.

If offset problems occur because of shield or ground leads with large current

flow, tying the problem leads into the

terminals next to the excitation and

pulse-counter channels should help. Problem leads can also be tied directly to

the ground lug to minimize induced single-ended offset voltages.

1.8 Powering Sensors and Peripherals

The CR800 is a convenient source of power for sensors and peripherals

requiring a continuous or semi-continuous 5 VDC or 12 VDC source. The

CR800 has two continuous 12-Volt (12V) supply terminals, one switched 12

Volt (SW-12) supply terminals, and one continuous 5 Volt (5V) supply

terminals. Voltage on the 12V and SW-12 terminals will change with the

CR800 supply voltage. The 5V terminal is regulated and will always remain

near 5 Volts (±4%)so long as the CR800 supply voltage remains above 9.6

Volts. The 5V terminal is not suitable for resistive bridge sensor excitation.

Table 1.8-1 shows the current limits of the 12-Volt and 5 Volt ports. Table

1.8-2 shows current requirements for several CSI peripherals. Other devices

normally have current requirements listed in their specifications. Current drain

of all peripherals and sensors combined should not exceed current sourcing

limits of the CR800.

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

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