Alstom SHPM 101 - Page 195

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 59 of 71
Figure 68: Permissive underreach scheme
100ms
0
Z
1
A
Z
1
B
Z
1
C
Z
2
A
Z
2
B
Z
2
C
SOTF En CRX
Z
3
A
Z
3
B
Z
3
C
Z
1
A'
Z
1
B'
Z
1
C'
Aided Trip A
Aided Trip B
Aided Trip C
Z2t Z3t
CTX
CRX Ann.
SK2-9
& &
&
&
1
&
S
Q
R
&
S
Q
R
S
Q
R
&
1
0
t
Z3
1 &
0
t
Z2
1
&