Crown Macro-Tech 5002VZ Manuel de service Page 24
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
MA-5002VZ Service Manual
4-10 Circuit Theory
130446-1 Rev. A
©2000 Crown International, Inc.
As this occurs, all op-amps in the amplifier receive
power, including front-end stages, relay power control
U111C, and standby control U111B. The output of
U111C powers relay K700 via relay drive transistor
Q700. When the output of this op-amp goes high, Q700
turns on and the relay closes. The output of U111C is
held low until the amplifier delay times out by compar-
ing a high voltage on its inverting input to an RC net-
work voltage on its non-inverting input. R329 and R330
fix a window at about +10.4VDC. At turn-on, C220 (a
10 µF cap) is fully discharged. In that first instant, it keeps
–15V on the non-inverting input of U111C, keeping its
output low. As the capacitor charges it produces a
ramped rise in voltage as it charges through R327. Af-
ter about 4 seconds, the voltage between R327 and
R328 exceeds the window voltage and U111C output
goes high, in turn causing relay K700 to close.
Note: Any protection signal within the amplifier which is
used to shut it down will discharge this capacitor (C120),
immediately causing the relay (K700) to open. Upon
clearance of such a shut-down protection signal, the
charge will begin again with the same ramp effect and
same delay.
The ramped voltage on the capacitor C120 is also
sensed by Standby amplifier U111B. Its unity gain out-
put is non-inverting. It drives the Soft-start op-amp
(U701A) inverting input with its ramp to control the rate
at which the field develops in the toroid. On the non-
inverting input to U701A is the pulsed DC drive from
the U701B/Q708 pulse circuit. Jumper JP1 may be set
to 50 or 60 Hz, but must be set properly to have the
correct pulse width for soft-start. Pulse width is deter-
mined by C717 and either R777 (50 Hz) or R777 in par-
allel with R806 (60 Hz).
STANDBY
DRIVER
VOLTAGE
DIVIDER
WITH C120
+15V
-15V
-
+
+10.4V
LOW
VOLTAGE
POWER
SUPPLY
+15V
-15V
+24V
-24V
DC PULSE
WIDTH
CONTROL
POWER
ON
RELAY
DRIVE
RELAY
K700
SOFT-START
DRIVER
-
+
POSITOR
5.0 OHM
FAN
DRIVERS
-
+
TEMPERATURE CH 1
TEMPERATURE CH 2
ODEP CH 1
ODEP CH 2
CH 1 FAN
CONTROL
CH 2 FAN
CONTROL
POWER
SWITCH
TO CH 2 SOFT-START DRIVER
Portion of
Main Module
POWER
XFMR
FANS
FAULT
DC/LFI
OV/TSW
PWRLOSS
TSW1
TSW2
Figure 4.6 Soft-start and Fan Control
- 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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