Section 6. Troubleshooting
6-5
6.5.3 Power Supply Problems
1.
Check the system as indicated in Section 6.5.1. One additional check is to
measure the voltage coming out of the ribbon cable that connects the
communication option to the plug marked “CS I/O”. You will need a
voltmeter with very fine probe tips or two small pieces of fine gage wire.
Paper clips are too big.
Unplug the ribbon cable from the communication option. Hold the plug so
that you are looking at the sockets with the two rows of sockets running
horizontal, longest row of sockets on the top. Socket one is on the far
right, top row. There is a molded bar between sockets 1 and 2. The count
of the sockets goes from 1 to 5 right to left on the top row of sockets and
from 6 to 9 right to left on the bottom row of sockets. To measure the 5
VDC supply measure between sockets 1 and 2. Socket 1 is the +5 VDC
side and socket 2 is ground. The measurement should be from 4.95 - 5.03
VDC. If it’s outside this range, it could be damaged and cause the
datalogger not to communicate. Call Campbell Scientific.
If you are using wire inserted into the sockets to
measure from, do not let them touch! The 5 VDC
supply can be shorted out and damaged.
If a phone modem is being used, then also measure between socket 8 which
is the 12 VDC supply voltage and socket 2. Whatever is measured here
should be identical to the battery voltage.
If these voltages are not present or incorrect, then unplug the ribbon cable
from the “CS I/O” plug and repeat the measurements at the plug. If the
measurements are fine at the plug, then the ribbon cable could be bad. Call
your local Toro Distributor for a replacement. If the measurements are
also bad at the plug, then the station could be damaged internally. Call
your local Toro Distributor for support.
2.
If AC power is present but less than 17.0 VAC, then disconnect the
transformer from the weather station and measure the transformer under a
no load condition. If the voltage remains the same, then the transformer is
bad or there is a problem with the wire path between the weather station
and the transformer. The transformer is a heavy duty doorbell transformer
that can be bought at any hardware store. The manufacturer and model
number is Nutone 301-T 16VAC 30W. The transformer is unregulated
and the voltage output is usually between 18.0 - 20.0 VAC when connected
to the weather station. Make sure that voltages going into the transformer
on the primary side are at least 115 VAC.
The regulator circuitry is limited to 24 AC input voltage. Any
higher voltage will damage the circuitry.
If the voltage goes up when disconnected from the station, then check the
battery voltage to see if it quickly drops off when disconnected from AC
power. The battery could have a shorted cell which is loading up the
system. If this is the problem, then call your local Toro distributor for a
WARNING
NOTE
