Nautel NX50, Руководство по устранению неисправностей

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NX50 Troubleshooting Manual Responding to alarms
Page 1-48 Issue 6.0 2019-04-01
Module #: Low B+ voltage
A
Module # Low B+ Voltage
alarm is triggered when the B+ voltage is less than 75% of its
nominal level.
1. If all RF power modules are reporting this alarm, it is very likely there is also a
Rack #:
Low B+
alarm. If so, the fault is not likely associated with an RF power module;
proceed to “Rack #: Low AC Voltage” on page 1-49 for further troubleshooting
information. If not, proceed to Step 2 .
2. Check and, if necessary, replace the fuse on the power module interface PWB for the
affected RF power module. Each power module interface PWB serves four RF power
modules and therefore has four B+ fuses (F1 through F4). Refer to Figures MD-1 and
MD-2 in the Mechanical Drawings section of this manual to locate the associated
power module interface PWB and then refer to Figure MD-4 or MD-5 to locate the
specific fuse.
3. Check and, if necessary, replace the affected RF power module. See “Troubleshooting
RF power modules” on page 56.
Rack #: Low B+ Voltage
A Rack #:
Low B+ Voltage
alarm is triggered when the B+ voltage is at least 25% below its
expected level. Recovery from this alarm is automatic when the B+ voltage rises to an
acceptable level.
WARNING:
failure to follow the rf power module removal instructions may
result in injury to the operator and serious physical damage to the rf
power module and transmitter.
NOTE:
An NX50 transmitter has only one rack (or cabinet) and will only display
Rack 1.