Xylem SIT65 SATELLITE INTERNET TELEMETRY - Manual (Page 16)

Global Water Instrumentation
16
Troubleshooting
The biggest source of trouble is due to insufficient battery voltage. If the unit is
transmitting erratically or has stopped, look at the trend in battery voltage going back
a week or more. The battery voltage monitor can be a very good indicator of what
the problem may be. Sudden changes in system voltage may be caused by sudden
changes in the local environmental, an electrical problem that is drawing excessive
current, or a problem with the charging system. A slowly dropping voltage may
indicate that the battery is losing its capacity and needs to be replaced. Other signs
of this are that the problem will likely occur when going into fall or winter, and that the
size of the voltage fluctuations from day to night will be larger than normal.
Besides checking the battery voltage monitor at the database, there is another tool
for troubleshooting the system. LED’s on the controller and radio modem show the
system operation, battery level, whether data is waiting to be transmitted, and if a
satellite is being received with sufficient signal strength.
SV: Sensor Voltage. This LED is red and has different functions depending on what
mode the system is in. During the time that the analog sensors are powered up, the
sensor warm-up time, it is lit continuously. When the system is in a standby mode
the LED blinks briefly every 15 seconds when the battery voltage is above 12.0 volts,
and every 5 seconds when the voltage is below 12.0 volts,
RV: Radio Voltage. The LED is yellow and is lit while the radio modem is turned on.
The radio is on continuously when the battery voltage is above 12.8 volts. Below this
voltage, the radio is kept on only when attempting to transmit.
TX: Transmit. This LED is green and is on when transmitting data to the radio
modem. It also blinks briefly every 15 seconds when in standby mode and the
battery is above 12.8 volts.
Signal: Signal Strength. This is a dual-color LED that is on only when power is
applied to the modem. The LED is green continuously when in standby mode and
receiving good signal strength. It blinks green every second when communicating
Signal
Buffer