Crown Macro-Tech 5002VZ Manuel de service Page 21
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Circuit Theory 4-7
130446-1 Rev. A
MA-5002VZ Service Manual
©2000 Crown International, Inc.
ODEP Inputs:
Temperature
±VCC
Output Current
ODEP Outputs:
Calibrated Temperature, for monitoring
±ODEP Level, for monitoring
±ODEP Level, for Bi-ODEP control of VZ Supply
±ODEP Level, to limit drive at ±Voltage Translators (±LH)
±ODEP Level, to limit Low Side Bias (±LL)
ODEP Indication (front panel LEDs)
+Temp 1
Channel 1 ODEP Circuitry shown
+IC 1
+ICOM 1
Common Output Buss
Q519 LS
Output
R
e
+VCC
+VCC
RC Network
Thermal Model
+ODEP Output
+ODEP Amplifier
Calibrated Temperature Output
LM-334Z
Thermal Sensor
(+2.98V at 25˚C,
+10mV/˚C Rise)
Buffer Amplifier
Thermal Limit Amplifier
-IC 1
-ICOM 1
Q524 LS
Output
R
e
-VCC
-VCC
RC Network
Thermal Model
-ODEP Output
-ODEP Amplifier
-Temp 1
LM-334Z
Thermal Sensor
PWR LOSS
PWR 1
FAULT 1
+LL 1
-LH 1
-LL 1
+LH 1
On Main ModuleOff Main
Module
-12V
+9V
Cold
Hot
+12V
-9V
Cold
Hot
output stage: a. until power-up delay has timed out; b.
immediately upon indication of any failure mode; c. im-
mediately upon loss of AC mains (power-down or ac-
tual loss of AC service).
4.4.2 ODEP Circuitry
±TEMP signals are produced by U500 and U501 on
the output modules. U108, on the main module, is a
buffer which drives the temperature sense test point.
U117A has a fixed window voltage of 6.2V via Zener
D129. If heatsink temperature level exceeds about
130°C, U117A output will cause both the positive and
negative ODEP amplifiers to go into hard ODEP limit-
ing. When the thermal condition clears, this limiting con-
dition will also clear.
+VCC enters via dual PNP transistor pack U116.
Positive ODEP bias is adjusted by R182. The voltage at
that point controls the static balance of the U116 de-
vice. U116 combines the VCC and output current sense
information, the output of which represents output power
level. The common output is brought into RN101 where
it provides the reference for temperature and power.
U112B is the active device and, together with the power
signal, drives the ODEP amplifier U112A. The RC net-
work in the feedback path of U112A models the ther-
mal junctions from output device die to housing, hous-
Figure 4.4 Simplified ODEP Circuitry
- SERVICE MANUAL 1
- Macro-Tech® 1
- Revision History 3
- Table of Contents 5
- 1 Introduction 7
- 1-2 Introduction 8
- 2 Specifications 9
- ±10 millivolts 10
- 2-4 Specifications 12
- 3 Voltage Conversion 13
- INSTRUCTIONS 13
- 3-2 Voltage Conversion 14
- 4 Circuit Theory 15
- 4-2 Circuit Theory 16
- 4.2.2 Output Stage Circuitry 17
- 4.3 VZ Power Supply 18
- 4.3.2 VZ Supply Circuitry 19
- 4.4 ODEP Theory 20
- On Main ModuleOff Main 21
- 4.5 Front End Theory 22
- 4.6 Protection Systems 23
- 4-10 Circuit Theory 24
- 4.6.2 Over-voltage 25
- 4.6.3 DC/LF 25
- 4.6.5 Output Thermal 26
- 4.6.6 Transformer Thermal 26
- 4.6.7 FET Thermal 26
- 4.7 Display 27
- 4.8 Mono Modes 27
- 4.8.2 Parallel Mono 28
- 5 Maintenance 29
- 5.3.2 LED Checks 30
- Maintenance 5-3 31
- 5.4 Test Procedures 32
- 5-6 Maintenance 34
- Maintenance 5-7 35
- Maintenance 5-9 37
- 5-10 Maintenance 38
- Figure 5.3 10-kHz Square Wave 38
- Maintenance 5-11 39
- ENABLECH2 40
- 5-14 Maintenance 42
- 6 Parts 43
- 6-2 Parts 44
- 7 Exploded View Parts 45
- 7-2 Exploded View Parts 46
- 7.1 Main Chassis Assembly 47
- 7-4 Exploded View Parts 48
- 7.2 Front Chassis Assembly 49
- 7-6 Exploded View Parts 50
- 7.3 Middle Chassis Assembly 51
- 7-8 Exploded View Parts 52
- 7.4 Rear Chassis Assembly 53
- 7-10 Exploded View Parts 54
- Exploded View Parts 7-11 55
- 7-12 Exploded View Parts 56
- 7.6 Transformer Assembly 57
- 7-14 Exploded View Parts 58
- Exploded View Parts 7-15 59
- 7-16 Exploded View Parts 60
- Exploded View Parts 7-17 61
- 7-18 Exploded View Parts 62
- Exploded View Parts 7-19 63
- 7-20 Exploded View Parts 64
- Exploded View Parts 7-21 65
- 7-22 Exploded View Parts 66
- Figure 7.12 Output Assembly 66
- 7.12 Output Assembly 67
- 7-24 Exploded View Parts 68
- Exploded View Parts 7-25 69
- 7-26 Exploded View Parts 70
- Interconnect Cables 71
- 7-28 Exploded View Parts 72
- 8 Module and Schematic 73
- Information 73
- 9 Module Parts 75
- 9-2 Module Parts 76
- Module Parts 9-3 77
- 9-4 Module Parts 78
- Module Parts 9-5 79
- 9-6 Module Parts 80
- Module Parts 9-7 81
- 9-8 Module Parts 82
- Module Parts 9-9 83
- 9-10 Module Parts 84
- Module Parts 9-11 85
- 9-12 Module Parts 86
- Module Parts 9-13 87
- 9-14 Module Parts 88
- Module Parts 9-15 89
- 9-16 Module Parts 90
- Module Parts 9-17 91
- 9-18 Module Parts 92
- Module Parts 9-19 93
- 9-20 Module Parts 94
- Module Parts 9-21 95
- 9-22 Module Parts 96
- Module Parts 9-23 97
- 9-24 Module Parts 98
- Module Parts 9-25 99
- MA-5002VZ Service Manual 100
- 9-26 Module Parts 100
- 130446-1 Rev. A 100
- Module Parts 9-27 101
- 9-28 Module Parts 102
- (Component Side) 103
- 125903-4 PWA Component Map 103
- 9-30 Module Parts 104
- Module Parts 9-31 105
- 9-32 Module Parts 106
- Module Parts 9-33 107
- 9-34 Module Parts 108
- Module Parts 9-35 109
- 9-36 Module Parts 110
- Module Parts 9-37 111
- 9-38 Module Parts 112
- 127488-2 PWA Component Map 113
- 9-40 Module Parts 114
- Module Parts 9-41 115
- 9-42 Module Parts 116
- Module Parts 9-43 117
- 9-44 Module Parts 118
- Module Parts 9-45 119
- 9-46 Module Parts 120
- Module Parts 9-47 121
- 9-48 Module Parts 122
- Q42929-2 PWA Component Map 123
- 9-50 Module Parts 124
- Q42934-2 Negative Emitter PWA 125
- 9-52 Module Parts 126
- Q42935-9 Positive Emitter PWA 127
- 9-54 Module Parts 128
- Module Parts 9-55 129
- 9-56 Module Parts 130
- Module Parts 9-57 131
- 9-58 Module Parts 132
- Module Parts 9-59 133
- 9-60 Module Parts 134
- Module Parts 9-61 135
- 9-62 Module Parts 136
- Module Parts 9-63 137
- 9-64 Module Parts 138
- 10 Schematics 139
- 10-2 Schematics 140
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