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KX-NCP500GR
4.6.5.
Protective Circuit Operation Section
Part 6 provides a description of the overvoltage/overheat protection circuits.
1. Abnormal State Detection Circuit
The abnormality detection circuit consists of the transistor Q520/Q521 thyristor circuits.
If power operation becomes abnormal and a signal is transmitted to the abnormality detection circuit, Q521 is turned on, cur-
rent flows to the diode of PC50 and is transmitted to the control circuit of the main converter, thereby shutting down main con-
verter operation. (See Part 2)
2. Overheat Protection Circuit
When temperature inside the power source rises to an abnormal temperature, the resistance of posister PTC540 rises, tran-
sistor Q540 is turned on, and the signalis transmitted to the abnormality detection circuit via D542.
3. Overvoltage Protection Circuit
If voltage of either 15V, 15VPT or 41V output becomes excessively high, the voltage is transmitted to the abnormality detec-
tion circuit via Zener diode D526.
Содержание KX-NCP1000GR
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Страница 12: ...12 KX NCP500GR 4 2 Power Supply Block Diagram ...
Страница 20: ...20 KX NCP500GR 4 5 5 System Control 4 5 5 1 System Control Block Diagram ...
Страница 21: ...21 KX NCP500GR 4 5 5 2 Voice TDM Highway Bus Block Diagram ...
Страница 23: ...23 KX NCP500GR 4 5 6 Back Board Signal Connection Diagram 4 5 6 1 CT Bus System Connection Diagram ...
Страница 24: ...24 KX NCP500GR 4 5 6 2 EC Bus System Connection Diagram ...
Страница 32: ...32 KX NCP500GR 5 Location of Controls and Components 5 1 Name and Locations ...
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Страница 53: ...53 KX NCP500GR 9 Troubleshooting Guide 9 1 IPCMPR Card 9 1 1 Startup ...
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Страница 57: ...57 KX NCP500GR 9 1 1 1 Main alarm light turns on ...
Страница 58: ...58 KX NCP500GR 9 1 1 2 SD card access light does not flash ...
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Страница 61: ...61 KX NCP500GR 9 1 1 6 Option card cannot start up ...
Страница 62: ...62 KX NCP500GR 9 1 2 Phone Call 9 1 2 1 The path cannot connect ...
Страница 63: ...63 KX NCP500GR 9 1 2 2 Noise is created ...
Страница 64: ...64 KX NCP500GR 9 1 3 Paging 9 1 3 1 Noise is created ...
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Страница 66: ...66 KX NCP500GR 9 1 4 Using MOH ...
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Страница 68: ...68 KX NCP500GR 9 1 5 LAN 9 1 5 1 LAN Connection ...
Страница 69: ...69 KX NCP500GR 9 1 6 ESVM 9 1 6 1 ESVM function record play ...
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Страница 71: ...71 KX NCP500GR 9 1 7 RS 232C 9 1 7 1 RS 232C Connection ...
Страница 72: ...72 KX NCP500GR 9 1 8 SD card IF ...
Страница 73: ...73 KX NCP500GR 9 1 9 Other ...
Страница 75: ...75 KX NCP500GR 9 2 1 1 Defective parts list ...
Страница 77: ...77 KX NCP500GR 9 2 3 15VPT 41V output voltage not output 15V only output 9 2 3 1 Defective parts list ...
Страница 78: ...78 KX NCP500GR 9 2 4 15VPT output voltage only not output 9 2 4 1 Defective parts list ...
Страница 79: ...79 KX NCP500GR 9 2 5 41V output voltage only not output 9 2 5 1 Defective parts list ...
Страница 80: ...80 KX NCP500GR 10 Service Fixture Tools 10 1 Extension Boards for Servicing ...
Страница 86: ...86 KX NCP500GR 12 2 Terminal Guide of the ICs Transistors and Diodes 12 2 1 IPCMPR Card 12 2 2 LED Board ...
Страница 87: ...87 KX NCP500GR 12 2 3 Power Supply Board ...
Страница 129: ...129 KX NCP500GR Waveform 7 Waveform 8 Waveform 9 159 984MHz 13 824MHz 16 384MHz ...
Страница 145: ...145 KX NCP500GR 16 2 Cabinet and Electrical Parts Location ...
Страница 146: ...146 KX NCP500GR 16 3 Accessories and Packing Material ...