Campbell CR800 Especificaciones descargar pdf (Pagina 58)

Section 1. Installation and Maintenance

1-6

1. A CR800 equipped with standard lead acid batteries should NEVER be

used in applications requiring intrinsically safe equipment.

2. A lead acid battery should not be housed in a gas-tight enclosure.

1.3.3 A100 Null Modem Adapter

The A100 Null Modem Adapter is used when 5 volts is needed to power

external modems with the PS100 or CH100. The A100 supplies 5 volts to pin

1 of the 9 pin null modem ports. A common use for the A100 is in

radiotelemetry networks.

The maximum current drain on the 5-volt supply of the A100 is 150 milliamps.

1.4 Solar Panels

Auxiliary photovoltaic power sources may be used to maintain charge on lead

acid batteries.

When selecting a solar panel, a rule-of-thumb is that on a stormy overcast day

the panel should provide enough charge to meet the system current drain

(assume 10% of average annual global radiation, kW/m

). Specific site

information, if available, could strongly influence the solar panel selection.

For example, local effects such as mountain shadows, fog from valley

inversion, snow, ice, leaves, birds, etc. shading the panel should be

considered.

1.5 Direct Battery Connection to the CR800 Wiring

Panel

Any clean, battery backed 11 to 16 VDC supply may be connected to the

Power In terminals on the front panel. When connecting external power to the

CR800, first, remove the green power connector from the CR800 front panel.

Insert the positive 12 V lead into the right-most terminal of the green

connector. Insert the ground lead in the left terminal. Double check polarity

before plugging the green connector into the panel.

1.6 Vehicle Power Supply Connections

If a CR800 is powered from the 12 Volts of a motor vehicle, a second 12 V

supply is required. When the starting motor of a vehicle with a 12 V electrical

system is engaged, the voltage drops considerably below 11 V, which would

cause the CR800 to stop measurement every time the vehicle is started. The

second 12 V supply prevents this malfunction. Figure 1.6-1 shows connecting

the two supplies to a CR800. The diodes allows the vehicle to power the

CR800 without the second supply attempting to power the vehicle.

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Campbell CR800 Especificaciones Pagina 58