Alstom SHPM 101 - Zone 3 Setting Board ZH0734

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 18 of 71
Figure 18: Zone 3 setting board ZH0734
Lenticular version only
Aspect
ratio
Switch a/b
0V
θ = 45
–12V
COMMON
+LSN REF
LDSN
INZPH
Signal
common
Zone 6
reverse
setting
(V + IZ)AZ3
+12V
A phase
attenuator
V
A
Zone 3 forward
setting V
OUT
= V
IN
/
(K31+K32)K33
B phase
attenuator
C phase
attenuator
A phase
attenuator
B phase
attenuator
C phase
attenuator
Zone 3 reverse
setting V
OUT
=
VIN /(K35+K36)
(K33 +K35)
V
A
Common
V
B
V
B
Common
V
C
V
C
Common
Zone
3/6
voltage
and
current
mixing/
squaring
circuits
(V + IZ)BZ3
(V + IZ)CZ3
(V + IZ)ABZ3
(V + IZ)BCZ3
(V + IZ)CAZ3
(V + IZ)ABZ6
(V + IZ)AZ3
(V + IZ)BCZ3
(V + IZ)CZ3
(V + IZ)ABZ3
(V + IZ)BCZ3
(V + IZ)CAZ3
(V + IZ)ABZ6
– LSN REF
X8
+12V
MCK/14
MCK/4
Low set
neutral
level
detector
θ = 68
.41
67
1
–I
A
Z
PH
–I
B
Z
PH
–I
C
Z
PH
I
N
Z
N
I
N