User Manual

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Speed Monitor IFTA T8846
Issue 2 Apr 10 PD-T8846 11
3.1. Field Power Inputs
This section details the field power input connections for each speed monitor input group.
There are three 4 way connectors on the FTA which provide the field power interface to the FTA. Each
connector is dedicated to one speed input group.
Refer to Figure 3 for the location of the interface sockets
Table 2 - Field Power Input Connections
Interface Pin Signal Name Description
SK1 A1 Group 1 Vfield A Input +24Vdc (A) Dual redundant power supply input for group 1 speed
inputs.
SK1 A2 Group 1 Vfield Return
Input
SK1 A3 Group 1 Vfield Return
Input
0V Vfield Power supply return for group 1 speed inputs.
SK1 B1 Group 1 Vfield B Input +24Vdc (B) Dual redundant power supply input for group 1 speed
inputs.
SK3 A1 Group 2 Vfield A Input +24Vdc (A) Dual redundant power supply input for group 2 speed
inputs.
SK3 A2 Group 2 Vfield Return
Input
SK3 A3 Group 2 Vfield Return
Input
0V Vfield Power supply return for group 2 speed inputs.
SK3 B1 Group 2 Vfield B Input +24Vdc (B) Dual redundant power supply input for group 2 speed
inputs.
SK5 A1 Group 3 Vfield A Input +24Vdc (A) Dual redundant power supply input for group 3 speed
inputs.
SK5 A2 Group 3 Vfield Return
Input
SK5 A3 Group 3 Vfield Return
Input
0V Vfield Power supply return for group 3 speed inputs.
SK5 B1 Group 3 Vfield B Input +24Vdc (B) Dual redundant power supply input for group 3 speed
inputs.