User's Manual
Table Of Contents
- KH1264 ISSUE 1
- CHAPTER 1
- CHAPTER 2
- CHAPTER 3
- CONTENTS
- ILLUSTRATIONS
- Figure 1 - Transceiver (DTX-A3): Module Locations 34
- Figure 2 - Drive Control Unit (GTX-A24): Module Locations 35
- Figure 3 X-band Upmast Transceiver (DTX-A3): Functional Diagram Figure 3 38
- Figure 4 X-band Upmast Transceiver (DTX-A3): Interconnection Diagram Figure 4 39
- Figure 5 - Drive Control Unit (GTX-A24): Block Diagram 319
- CHAPTER 4
- CONTENTS
- TABLES
- ILLUSTRATIONS
- Figure 1 - Transceiver (DTX-A3): Installation Dimensions 49
- Figure 2 - Transceiver (DTX-A3): Mast Mounting 410
- Figure 3 - Transceiver (DTX-A3): Fitting Kit 411
- Figure 4 - Suggested Antenna Lifting Arrangement 412
- Figure 5 - Drive Control Unit (GTX-A24): Installation Dimensions 413
- Figure 6 - Mains Isolator: Installation Dimensions 414
- Figure 7 - Transceiver (DTX-A3): Cableform Routing 419
- Figure 8 - Drive Control Unit (GTX-A24): Cableform Routing 420
- Figure 9 - Cable Gland: Assembly 421
- Figure 10 - Transceiver (DTX-A3): External Connections 423
- CHAPTER 5
- CHAPTER 6
- CONTENTS
- INTRODUCTION 63
- PLANNED MAINTENANCE 63
- DIAGNOSTIC MAINTENANCE 64
- CORRECTIVE MAINTENANCE 611
- TRANSCEIVER (DTX-A3) 612
- Access 612
- Removal of Rotating Joint (45-750-0034-001) 612
- Replacement of Rotating Joint (45-750-0034-001) 613
- Removal of Gearbox and Motor (55-100-0273-001) 613
- Replacement of Gearbox and Motor (55-100-0273-001) 613
- Removal of Azimuth Encoder (GTX-A188) 613
- Replacement of Azimuth Encoder (GTX-A188) 613
- Transceiver (DTX-A115) - Removal 614
- Transceiver (DTX-A115) - Replacement 614
- Power Supply (45-690-0062-002) and PSU Sense PCB (DTX-A121) - Removal 615
- Power Supply (45-690-0062-002) and PSU Sense PCB (DTX-A121) - Replacement 615
- CAN Adapter PCB (NNR-A981) - Removal 615
- CAN Adapter PCB (NNR-A981) - Replacement 615
- SharpEye Azimuth Interface PCB (DTX-A151) - Removal 616
- SharpEye Azimuth Interface PCB (DTX-A151) - Replacement 616
- DRIVE CONTROL UNIT (GTX-A24) 618
- CHECKS AFTER UNIT REPLACEMENT 620
- TRANSCEIVER (DTX-A3) 612
- ILLUSTRATIONS
- CONTENTS
- CHAPTER 7
- INSTALLATION AND SERVICE REPORTS
DRIVE CON TROL UNIT (GTX-A24)
40 The drive control unit provides 3 phase supplies for the antenna turning motor in the
SharpEye
TM
Upmast Transceiver. It accepts a 220 V single phase mains supply and
generates a 3 phase supply at either 25 Hz or 50 Hz with the frequency set internally, either of
which may be selected from the display, or by physical wire links on the Drive Control Unit.
25 Hz is used to provide an antenna speed of 22 rpm and 50 Hz is used to provide an antenna
speed of 44 rpm. If required, a transformer can be fitted to the mains input to enable the unit to be
used with 110 V mains.
41 Figure 5 shows the interconnections within the Drive Control Unit. The Drive Control
Unit comprises:
(1) Inverter (45-690-0033-001)
(2) Drive Interface PCB (GTX-A104)
(3) Mains input filter (part of Power Input Cableform GTX-A217)
(4) Man Aloft Keyswitch (45-613-4205)
(5) Output filters (ferrite cores - part of Power Output Cableform GTX-A196)
42 The presence of the mains input is indicated by the MAINS ON neon indicator (LP1) on
the top of the unit being lit.
43 The mains input is passed through the input filter, which slows down the rate of rise of
current input pulses to reduce the generation of interference. The mains is then applied to
the inverter, which converts the single-phase input at 50/60 Hz into 3-phase at 0 Hz to 120 Hz
(variable). The 3-phase output is generated as switched mode power pulses. These pulses are at
the peak output voltage, which is approximately 320 V with 5 kHz switching frequency. The
effective rms voltage at the output varies from 130 V to 230 V AC depending on the antenna
motor load.
44 The output frequency sets the speed of antenna rotation. The output frequency is set to
25 Hz for 22 rpm and 50 Hz for 44 rpm antenna rotation speed. The speed is set at the
inverter on installation and if the inverter is replaced, the new inverter must be correctly set after
repair. Note that the inverter is set on installation to provide a 25 Hz or 50 Hz output using wire
links. The output frequency is also dependent on the input frequency, so that the new inverter
must be programmed for 50 Hz or 60 Hz input as described in Chapter 5. Most of the settings are
the manufacturer's defaults, but others must be set up as specified.
45 The inverter is set to provide an acceleration time of 2 seconds before reaching full speed,
this provides a soft-start function for the antenna on start up. When the power is switched
off, the inverter provides a deceleration time of 10 seconds to slow the antenna rotation. These
functions reduce the torque on the antenna during starting and stopping.
46 The Drive Interface PCB (GTX-A104) provides the control interface to the inverter. It
also provides the interface to external control lines to allow one of the antenna speeds to
be selected by wire links on installation. It uses opto-isolators to allow the control signals to the
inverter to be compatible with the inverter.
KH1264
Chap ter 3
Is sue 2 Page 3.17