GE 845 - Page 236

4–108 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
SYSTEM CHAPTER 4: SETPOINTS
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
TAP
BCD bit 6
Input
BCD bit 5
Input
BCD bit 4
Input
BCD bit 3
Input
BCD bit 2
Input
BCD bit 1
Input
TAP
Position
+Tap 0 0 0 0 0 0 0
+Tap 0 0 0 0 0 1 1
+Tap 0 0 0 0 1 0 2
+Tap 0 0 0 0 1 1 3
+Tap 0 0 0 1 0 0 4
+Tap 0 0 0 1 0 1 5
+Tap 0 0 0 1 1 0 6
+Tap 0 0 0 1 1 1 7
+Tap 0 0 1 0 0 0 8
+Tap 0 0 1 0 0 1 9
+Tap 0 0 1 0 1 0 invalid
+Tap 0 0 1 0 1 1 invalid
+Tap 0 0 1 1 0 0 invalid
+Tap 0 0 1 1 0 1 invalid
+Tap 0 0 1 1 1 0 invalid
+Tap 0 0 1 1 1 1 invalid
MIN
TAP
BCD bit 6
Input
BCD bit 5
Input
BCD bit 4
Input
BCD bit 3
Input
BCD bit 2
Input
BCD bit 1
Input
TAP
Position
+Tap 0 1 0 0 0 0 10
+Tap 0 1 0 0 0 1 11
+Tap 0 1 0 0 1 0 12
+Tap 0 1 0 0 1 1 13
+Tap 0 1 0 1 0 0 14
+Tap 0 1 0 1 0 1 15
+Tap 0 1 0 1 1 0 16