Alstom SHPM 101 - Level Detectors ZH0729

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 9 of 71
Figure 9: Level detectors ZH0729
LDIA
I
A
Common
MCK/7
MCK
MCK/14
MCK/28
Sig
Common
Stopped
Clock
Detector
1
LD
ALARM
Hysteresis
for
LDLSN
Reference
Wrong
Detector
–VREF
+VREF
LDHSN
–12V
0V
+12V
–LSN REF
LDLSN
LDOVC
MCK/4
+7 +2
+2
Negative Voltage
Reference
LDLSA
LDOVA
LDLSB
LDOVB
LDLSC
Level
Detector
Element
Level
Detector
Element
Level
Detector
Element
Level
Detector
Element
Level
Detector
Element
Level
Detector
Element
Level
Detector
Element
Precision
Rectifier
Precision
Rectifier
Precision
Rectifier
Precision
Rectifier
Positive
Voltage
Reference
VA
V
A
Common
LBDI
I
B
Common
V
B
V
B
Common
LDIC
I
C
Common
VC
V
C
Common
1
+12V
0V
+LSN REF
DC
G
3
G
1
G
1
G
1
–1
G
2
1