Nautel XR6, Troubleshooting Manual, Page: 26 / 291

XR6/XR3 Troubleshooting Manual Responding to alarms
Page 1-6 Issue 3.0 2009-07-15
Int. Serial Fail SD: Exciter
RI:
Exciter Fail
This alarm occurs when there is no
communication with the remote interface PWB
for 2 seconds. See
page 1-17 .
Low B+
Voltage SD: AC Mains
RI: Low B
+
This alarm is triggered if the B
+
voltage falls
below its factory-set threshold. See page 1-10 .
Low Backup
Battery RI: Memory Battery
Alarm
This alarm is triggered when the voltage of the
backup battery has fallen below an acceptable
level. See
page 1-19 .
LVPS Fault SD: Low Voltage Power
Supply
RI: LVPS Fail
The +24 V, +15 V, -15 V and +5 V power
supplies are monitored. This fault is reported if
one or more of these voltages exceeds its
specified limits. See
page 1-12 .
Mod Driver
Fail A SD: Exciter
RI:
Exciter Fail
This fail is reported if the modulator drive on
exciter A is inoperative due to a high duty cycle.
See
page 1-14 .
Mod Driver
Fail B SD: Exciter
RI:
Exciter Fail
This fail is reported if the modulator drive on
exciter B is inoperative due to a high duty cycle.
See
page 1-14 .
Mod.
Protection SD: External Alarm This fail is reported from the remote interface
PWB to prevent overmodulation. See
page 1-18 .
PDM Drive
Fail SD: Exciter
RI:
Exciter Fail
This fail indicates that the PDM drive on the
active exciter is inoperative due to a low duty
cycle. See
page 1-14
PM Fault A SD: IPA/PA
RI:
Power Mod Fail
This alarm is triggered when power module A
reports a fault. See
page 1-9 .
PM Fault B SD: IPA/PA
RI:
Power Mod Fail
This alarm is triggered when RF power module
B (optional for XR6/XR3) reports a fault. See
page 1-9 .
RF Drive P/S
Fail SD: Low Voltage Power
Supply
RI: LVPS Fail
The RF drive power supply is monitored. This
fault will be reported if the voltage exceeds or
falls below the specified limits. See
page 1-12 .
Status
Message
System Diagram LEDs
Remote Interface
Alarms
Description/Action