Nautel VX150 - Page 25

VX150 TO VX2 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
VERSION 2.0 2023-04-20 PAGE 3.1.17
Exciter DC Voltage Failure Any of the following Exciter PWB voltage
meters meet the stated criteria for a period of
at least 5 seconds:
 Exciter PWB +5V Meter measures less
than +2.5 V or greater than +7.5 V
 Exciter PWB +3.3V Meter measures less
than +1.65 V or greater than +4.95 V
 Exciter PWB +2.5V Meter measures less
than +1.25 V or greater than +3.75 V
 Exciter PWB +1.5V Meter measures less
than +0.75 V or greater than +2.25 V
 Exciter PWB +1.1V Meter measures less
than +0.55 V or greater than +1.65 V
All of the following Analog Audio PWB
voltage meters meet the stated criteria for a
period of at least 5 seconds:
 Exciter PWB +5V Meter measures
between +2.5 V and +7.5 V
 Exciter PWB +3.3V Meter measures
between +1.65 V and +4.95 V
 Exciter PWB +2.5V Meter measures
between +1.25 V and +3.75 V
 Exciter PWB +1.5V Meter measures
between +0.75 V and +2.25 V
 Exciter PWB +1.1V Meter measures
between +0.55 V and +1.65 V
If the Exciter PWB +12V Failure alarm is
present, this is the most likely cause, so
refer to the troubleshooting for that
alarm.
Check the corresponding voltage test
points on the Exciter PWB using a digital
multimeter.
The next most likely cause is a
component failure on the Exciter PWB.
Consider replacement of the Exciter PWB.
See
Exciter PWB Replacement on
page 3.1.37.
Exciter Fault Summary alarm that is triggered if any of the
following alarms are triggered:
 Exciter +12V Failure
 Exciter DC Voltage Failure
 PGA Failure
 Invalid FPGA Image Signature
Cleared if all of the following alarms are
cleared:
 Exciter +12V Failure
 Exciter DC Voltage Failure
 FPGA Failure
 Invalid FPGA Image Signature
Summary alarm to indicate a possible
serious fault with the Exciter PWB. See
the troubleshooting for the associated
alarms in order to clear this alarm.
External Interlock Open connection between pins 1 and 2 on the
transmitter’s Interlock connector (Exciter J7).
Closed connection between pins 1 and 2 on
the Transmitter’s Interlock connector.
If integrated in a site interlock system,
then verify the status of that interlock
connection.
If using a jumper, verify the presence of
a jumper by examining transmitter rear
panel Interlock connector.
A mating connector and jumper are
installed in the Transmitter Interlock
connector before shipping.
Alarm Name Trigger Conditions Clear Conditions Troubleshooting