Campbell RAWS-F, Instruction Manual

Page: 28 / 58

RAWS-F Remote Automated Weather Station for Fire Weather
5.1.3 Maintenance
An occasional cleaning of the glass improves the solar panel’s efficiency.
5.1.4 Calibration
No calibration is required.
5.1.5 Troubleshooting
If a problem is suspected, the solar panel may be checked by measuring the
voltage output from the solar panel. Check the voltage with a voltmeter
connected between the two leads going to the CH100’s “CHG” “CHG”
terminals located inside the environmental enclosure (15 to 28 Vdc). There
must be solar radiation incident on the panel and there must be a load
connected to the solar panel. The load can be the datalogger, other equipment,
or a 75 ohm resistor capable of dissipating solar panel power between the two
leads. No voltage output implies a bad solar panel, regulator, or cable. The
magnitude of the voltage output depends on the incident solar radiation. Check
the sensor cable. Disconnect the connector and look for damaged pins. Try
connecting a substitute panel. Obtain an RMA number before returning the
SP10/20-QD to Campbell Scientific for repair.
5.2 Charger/Regulator
5.2.1 General Description
The 12 Volt charger/regulator (pn CH100) is a charging regulator for 12 V
rechargeable batteries. The CH100 is connected to an external charging source
such as an unregulated solar panel (pn SP20-QD or SP10-QD) or a wall
charger (pn 9591). The CH100 has two functions: blocking any current flow
from the battery to the solar panel, and limiting the source current to the
battery.
FIGURE 5-1. 12-volt charger/regulator
20