GE 845 Instruction Manual page 236

SYSTEM
4–108
Figure 4-30: An example of BCD decoder connections to an IO_A card for up to 19 taps
Table 4-18: All BCD combinations supported by the relay
MIN BCD bit 6 BCD bit 5
TAP Input Input
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
+Tap 0 0
MIN BCD bit 6 BCD bit 5
TAP Input Input
+Tap 0 1
+Tap 0 1
+Tap 0 1
+Tap 0 1
+Tap 0 1
+Tap 0 1
+Tap 0 1
BCD bit 4 BCD bit 3 BCD bit 2
Input Input Input
0 0 0
0 0 0
0 0 1
0 0 1
0 1 0
0 1 0
0 1 1
0 1 1
1 0 0
1 0 0
1 0 1
1 0 1
1 1 0
1 1 0
1 1 1
1 1 1
BCD bit 4 BCD bit 3 BCD bit 2
Input Input Input
0 0 0
0 0 0
0 0 1
0 0 1
0 1 0
0 1 0
0 1 1
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
BCD bit 1 TAP
Input Position
0 0
1 1
0 2
1 3
0 4
1 5
0 6
1 7
0 8
1 9
0 invalid
1 invalid
0 invalid
1 invalid
0 invalid
1 invalid
BCD bit 1 TAP
Input Position
0 10
1 11
0 12
1 13
0 14
1 15
0 16