Nautel GV10, Troubleshooting Manual

Page: 37 / 326

GV10/GV7.5 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
VERSION 3.2 2016-03-10 PAGE 4.1.29
Rack #: LVPS A (or B)
AC Fail Power Supply (red) This alarm occurs if LVPS module A (U2) or B (U3) is reporting an ac failure,
indicating its ac input voltage is less than 175 V ac. Check the ac voltage
applied to the suspect LVPS module. If the ac voltage is acceptable, replace
the LVPS module (see
“LVPS / Power Supply Module Replacement”
on page 4.1.50
).
Rack #: LVPS A (or B)
High Temperature
[LVPS A (or B) Temp] Power Supply (red) This alarm occurs if LVPS module A (U2) or B (U3) is reporting a high
temperature alarm, indicating its operating temperature has exceeded its
internal threshold of 105°C (221°F). This alarm is most likely caused by a
module fan failure or blockage. Allow the module to cool and attempt to
reset the alarm. Verify the module turns on and its fan is operational. If the
fan is not operational, inspect it for possible blockage. If necessary, replace
the LVPS module (see
“LVPS / Power Supply Module Replacement”
on page 4.1.50
).
Rack #: LVPS A (or B)
Low Line Power Supply (red) This alarm occurs if LVPS A (U2) or LVPS B (U3) is reporting a low ac input
voltage (less than 175 V ac, higher than 90 V ac). The power supply will
limit its associated module’s output.
.
Rack #: LVPS A (or B)
Missing Power Supply (amber) This alarm occurs if LVPS module A (U2) or B (U3) has been removed. Install
an operational LVPS module. The alarm may persist for several seconds after
replacing an LVPS module, before the LVPS module is recognized. If the
alarm persists after one minute, try reseating the LVPS module. This alarm
may also be caused by an ac power loss to the LVPS module. This alarm only
occurs if the system is configured to use LVPS A or B, as applicable (see
“Configuring LVPS Hardware” on page 3.2.114
) of the Operations &
Maintenance Manual.
Rack #: Module
Extraction Shutback Power Amplifier (red) This alarm occurs if the RF power module is removed without first being
inhibited via its front panel switch. Try reseating the RF power module. If
the alarm persists, suspect a fault with circuitry on the associated module
control/interface PWB.
Rack #: Reject Fan
Volts Fail (Rej Fan V
Fail) Power Supply (red) This alarm occurs if the fan voltage for the module is 10% high or 10% low
from the expected value. This may be the result of a fault with the
associated circuit on the module control/interface PWB (A3).
Rack #: Residual PA
Volts (Residual PA V) Exciter (red) This alarm indicates that after the transmitter has turned off its RF output, it
is unable to discharge the PA volts to a level that is below 10 V. This
condition will not allow the transmitter to turn on its RF output; however
the condition will be cleared once the PA volts reaches a level that is below
10 V. If the condition cannot be cleared automatically, the transmitter will
still be allowed to turn on. This condition will typically occur with a failed
PA or power supply module. Check for associated alarms and follow the
associated troubleshooting procedure.
Device and
Alarm Name
(AUI, UI)
Controller Front
Panel LED (color)
Description and Troubleshooting Action