Nautel XR6, Troubleshooting Manual, Page: 39 / 291

XR6/XR3 Troubleshooting Manual Responding to alarms
Issue 3.0 2009-07-15 Page 1-19
SoftStart OverTemp
The software keeps track of the calculated temperature of the softstart relays and triggers this fault if
that value is greater than 150°C. While this fault is on, RF power is not available. The temperature is
assumed to rise 20°C for each cold start and 10°C for each warm start. The temperature falls
exponentially as calculated by the software. The temperature estimate decays over time. When the
temperature falls below 150°C, the alarm clears on its own.
Low backup battery
The voltage of the backup battery has fallen below an acceptable level. Replace the battery on
XBT1
of
the control/display PWB (A1A1). This battery should be replaced while ac power is on. Should ac
power fail without adequate battery power, then the
Events Log
and
Real Time Clock
will be cleared.
The fault may be caused by a weak battery, or a fault in the detection or alarm circuitry on the
control/display PWB. If the alarm remains after the battery is replaced, suspect the control/display
PWB circuitry.
CAUTION:
Performing a warm or cold start while the
SoftStart OverTemp
fail is active is
strongly discouraged.
NOTE:
Batteries should be replaced once a year or as soon as weak batteries cause the
Low Backup
Battery
alarm to turn on. This helps prevent chemical dripping from an old battery, and to
ensure adequate backup voltage for the control/display PWB's microcontroller when the ac
power is turned off.