Nautel NX15 User manual

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NX15/NX25 Transmitter

Operations and Maintenance

Manual

Document:NHB-NX15-NX25-OPS

Issue: 6.0 2019-01-31

Status: Standard

Nautel Limited

10089 Peggy’s Cove Road

Hackett’s Cove, NS Canada B3Z 3J4

Phone: +1.902.823.3900 or

Toll Free: +1.877.6NAUTEL (6628835) (Canada & USA only)

Fax: +1.902.823.3183

Nautel Inc.

201 Target Industrial Circle

Bangor, Maine USA 04401

Phone: +1.207.947.8200

Fax: +1.207.947.3693

Customer Service (24 hour support)

+1.877.628.8353 (Canada & USA only)

+1.902.823.5100 (International)

Email: [email protected]

Web: www.nautel.com

The comparisons and other information provided in this document

have been prepared in good faith based on publicly available

information. The reader is encouraged to consult the respective

manufacturer's most recent published data for verification.

© Copyright 2019 NAUTEL. All rights reserved.

NX15/NX25 Operations and Maintenance Manual Table of contents

Page v

Contents

Release control record vii

Description 1-1

Ac-Dc Power Stage 1-2

Exciter Stage 1-4

Control/Monitor Stage 1-7

RF Power Stage 1-8

RF Output Network 1-9

Operating the transmitter 2-1

Using the AUI 2-2

Home page - describing the first page 2-19

Menu page - describing transmitter operations 2-20

Viewing Transmitter Log 2-22

Instrument Panels - viewing displays 2-29

Meters page - viewing real-time meters 2-45

Presets - editing operational settings 2-51

Preset Scheduler 2-67

Status - viewing transmitter status 2-72

User Accounts 2-74

User Settings 2-79

System Settings page 2-97

Precorrection Settings page 2-106

Changeover page - changing exciter transfer settings 2-115

Factory Settings 2-116

Remote I/O page 2-125

Audio Player 2-131

Using the ac disconnect switch 2-135

NX15/NX25 Operations and Maintenance Manual

Page vi Issue 6.0 2019-01-31

Using the Keyed Controlled Access System (optional) 2-138

Routine maintenance 3-1

Scheduled maintenance 3-1

Replacing the air filter 3-2

Performing on-air checks 3-4

Replacing the Control/Interface PWB battery 3-6

Inspecting lightning protection systems 3-7

Non-standard maintenance 4-1

Upgrading software 4-1

Updating or Replacing Compact Flash Card 4-4

List of terms 5-1

NX15/NX25 Operations and Maintenance Manual

Issue 6.0 2019-01-31 Page vii

Release control record

Issue Date Reason

6.0 2019-04-01 Supports hardware NARA59D and software version

NX SW 4.7 or higher.

NX15/NX25 Operations and Maintenance Manual

Page viii Issue 6.0 2019-01-31

NX15/NX25 Operations and Maintenance Manual Description

Issue 6.0 2019-01-31 Page 1-1

Section 1: Description

This section provides a high-level description of the transmitter’s key sections. The transmitter

circuitry is subdivided into five basic stages.

•Ac-Dc Power Stage

•Exciter Stage - see page 1-4

•Control/Monitor Stage - see page 1-7

•RF Power Stage - see page 1-8

•RF Output Network - see page 1-9 (includes combiner and filter)

Refer to the functional block diagram: see Figure 1.6 on page 1-15.

NX15/NX25 Electrical Schematics

Some descriptions in this section refer to electrical schematics (SD-#s). These are located at the

end of the NX15/NX25 Troubleshooting Manual.

Redundancy

The NX15/NX25 features redundancy in all key systems:

• RF power modules

•Exciters

• Cooling fans

• Low voltage power supplies

NX15/NX25 Operations and Maintenance Manual Description

Page 1-2 Issue 6.0 2019-01-31

Ac-Dc Power Stage

See electrical schematic SD-1. The ac/dc power supply stage contains the input power

transformer that receives the main ac input to the transmitter. It also contains the transmitter’s

low voltage power supplies and rack interface PWB. The ac/dc power supply stage also

includes a three-phase SCR rectifier assembly, B+ current sensor, B+ distribution assembly,

capacitor tray assembly and arc detector assembly.

Ac Power Transformer

The NX15/NX25’s power transformer can be set to use a range of input voltages. See Section

3, “Installing the power transformer” on page 3-1 in the NX15/NX25 Installation Manual.

High Voltage B+ Power Supply

The secondary of the power transformer is applied to the SCR rectifier assembly to create the

transmitter’s B+ voltage (normally 400 Vdc). The output of the rectifier assembly is fed

through the B+ current sensor, which supplies a B+ current sample to the rack interface PWB.

The rectifier assembly output is applied to a choke input filter and the B+ distribution

assembly, which then provide the B+ voltage to the RF power modules.

The B+ discharge relay, which is part of the capacitor assembly, opens when ac power is

applied and closes and ac power is removed, applying a high power discharge resistor across the

B+ bus to quickly discharge the voltage. When the discharge relay closes, a microswitch

ensures the SCR rectifier is immediately inhibited.

Low Voltage Power Supplies

One phase of the power transformer’s secondary is also used to provide a source for the low

voltage dc power supplies and an ac sample for the rack interface PWB. The low voltage power

supply outputs (+48 V, +15 V and +12 V) are distributed throughout the transmitter via the

rack interface PWB. The +48 V power supply sources the transmitter’s cooling fans. An

inhibit signal, controlled by the rack interface PWB, is applied to the +48 V power supply to

turn the fans on and off. The +15 V power supply sources all of the low voltage control

circuitry. The +12V power supply sources the SBC and the touchscreen monitor.