To Next PageTo Next PageWhat to do if Nautel Vector-LP VR125 Transmitter shows Low AC Voltage?
If your Nautel Transmitter indicates a low AC voltage, and the AC source voltage is present, first check the AC breaker at the back of the transmitter. If the breaker is working correctly, then the interface PWB (A11) should be replaced, as this may be the cause of the issue.
What to do if Nautel Vector-LP VR125 displays Over Current PS A or B?
If your Nautel Transmitter shows an 'Over Current PS A or B' error, replace the switch mode power supply PWB (A2 of the associated RF power module). If the transmitter is running in DC mode (optional) and the alarm is on the active side, replace the battery boost assembly A16. Otherwise, check the cabling between A7 and A3 through A6.
General| Brand | Nautel |
|---|---|
| Model | Vector-LP VR125 |
| Category | Transmitter |
| Language | English |
Provides an overview of the Vector-LP radio beacon transmitter's capabilities and features.
Guides on preparing the transmitter site prior to delivery and installation for optimal performance.
Details the criteria for the transmitter site, including dimensions, clearances, and environmental conditions.
Outlines essential precautions for protecting the transmitter from lightning-induced transients.
Specifies requirements for establishing a continuous, low-impedance path to earth for station grounding.
Details AC power source requirements, including surge protection and wiring considerations.
Details requirements for both AC and optional DC power sources for transmitter operation.
Explains how to control and monitor transmitter functions via remote interface or serial ports.
Covers the general installation procedures for all transmitter assemblies.
Provides detailed steps for connecting external control and monitor wiring to the remote interface PWB.
Details the procedures for connecting the AC power wiring, including interface protection unit connections.
Covers the step-by-step procedures for commissioning the transmitter, including initial checks.
Highlights safety precautions for handling solid-state devices and avoiding damage from transients.
Lists essential steps to verify before powering on the transmitter for the first time.
Details the procedure for the initial power-up of the transmitter and observing status indicators.
Provides safety precautions for operating the transmitter, warning against overdrive and disconnections.
Describes the procedures for emergency shutdown, including turning off RF output and complete power disconnection.
Explains the external safety interlock circuit and its role in inhibiting RF output when conditions are unsafe.
Provides an overview of the transmitter's controls and indicators, grouped by panel sections.
Details the primary local user interface, including the System Diagram, Control, Diagnostic Display, and Analog Meter.
Explains the graphic LCD display interface for controlling and monitoring transmitter parameters and events.
Explains how to view a list of current faults on the diagnostic display and how to clear alarms.
Explains how to set high/low power, modulation, and keying limits for transmitter operation.
Guides on selecting the transmitter's power source (AC, DC, BOTH, or NONE) and viewing related parameters.
Provides steps to re-align out-of-tolerance meter readings displayed on the diagnostic screen.
Explains how to adjust critical transmitter shutback thresholds for safety and performance.
Guides on adjusting the maximum allowable output gain in terms of carrier reference.
Details procedures for testing the operation of the transmitter's inactive (standby) side.
Covers configuration of active logic states for control and monitor points on the NDB site interface PWB.
Explains viewing power parameters and setting ATU current feedback for RF output regulation.
Highlights precautions for monitoring critical parameters and understanding system responses during testing.
Provides procedures to verify transmitter circuits are within factory specifications and includes adjustment guidance.
Lists the necessary steps that must be completed before performing any functional test procedures.
Details the procedure for the initial power-up and observation of transmitter status indicators.
Outlines standard adjustments to be verified after transmitter commissioning and routine maintenance.
Covers setting high/low RF power limits, modulation levels, and monitor delay periods for standby systems.
Details procedures to verify exciter changeover thresholds for power and modulation levels.
Provides procedures for calibrating the transmitter's forward power and related parameters.
Covers calibration of reflected power thresholds and output network alarm settings.
Explains how to equalize exciter gain to ensure consistent RF output between dual side transmitters.
Outlines routine maintenance procedures, including visual inspection intervals and cleaning.
Covers procedures for identifying and correcting defects or deficiencies that arise during transmitter operation.
Describes troubleshooting that can be performed from a remote location or locally at the transmitter site.
Explains remote fault diagnosis by monitoring RF output and polling transmitter status via software.
Describes local fault diagnosis by monitoring the diagnostic display and fault alarm indicators.
Covers troubleshooting procedures performed when proper operation cannot be restored, including dual-side systems.
Explains how to perform front panel fault analysis using system diagrams, diagnostic display, and event logs.
Provides procedures for replacing RF power modules indicated by diagnostic display status messages.
Details the steps for removing the top cover and lifting the RF power module from the transmitter cabinet.
Guides on the proper orientation and installation of an RF power module into the transmitter.
Explains how to check and replace Field Effect Transistors (FETs) that are prone to failure in RF power modules.
Covers procedures for replacing defective Printed Wiring Boards (PWBs) on the exciter panel.
Details the process for replacing the exciter interface PWB and its interconnecting PWBs.
Explains the function of the AC-DC power stage in converting input power to necessary internal voltages.
Details the theory of operation for the exciter stage, including its components and functions.
Details the theory of operation for the RF synthesizer PWBs, including DDS and frequency generation.
Details the carrier level control circuit, which uses analog multipliers to adjust gain based on reference signals.
Explains the theory of the interphase PDM generator, including pulse duration and duty cycle control.
Explains the microcontroller's role in interfacing with the diagnostic display and controlling various transmitter functions.
Explains how modulation depth for beacon, voice, and beacon/voice modes is controlled via digital pots.
Explains the theory of the control/monitor stage, including its components and functions.
Details the functions of the control/display PWB, including Carrier Ref outputs and alarm monitoring.
Explains the RF power stage's role in producing the transmitter's final RF output, including modules and filters.
Details the theory of operation for the RF power modules, including amplifiers, modulators, and power supplies.
