Alstom SHPM 101 - Zone 1;Zone 2 Setting Board ZH0732

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 12 of 71
Figure 12: Zone 1/Zone 2 setting board ZH0732
V
C
V
C
common
V
S
V
S
common
V
A
A phase
attenuator
B phase
attenuator
C phase
attenuator
Zone 1 setting
V
out
= V
in
/
(K11 + K12 + K13)K14
A phase
attenuator
Zone 1 ext setting
V
out
= V
in
/K15
B phase
attenuator
C phase
attenuator
Zone 1/
Zone 1 ext
selector
Zone 1
voltage
and current
mixing/
squaring
circuits
(V – IZ)AZ1
(V – IZ)BZ1
(V – IZ)CZ1
(V – IZ)AG
(V – IZ)BG
(V – IZ)CG
(V – IZ)ABZ1
(V – IZ)BCZ1
(V – IZ)CAZ1
V
A
common
Phase-phase
current
mixing/
squaring
circuits
–I
AB
Z
PH
–I
BC
Z
PH
–I
CA
Z
PH
–I
A
Z
PH
–I
B
Z
PH
–I
C
Z
PH
–I
N
Z
N
–I
N
Z
N
common
Zone 2
voltage
and current
mixing/
squaring
circuits
(V – IZ)AZ2
(V – IZ)BZ2
(V – IZ)CZ2
(V – IZ)ABZ2
(V – IZ)BCZ2
(V – IZ)CAZ2
B phase
attenuator
C phase
attenuator
Zone 2 setting
V
out
= V
in
/
(K21 + K22)K14
A phase
attenuator
Extend Z1
+12V
0V
–12V