Section 3
Installation
20
FT702LT/D Flat Front Wind Sensor Manual
The SPDs should be installed as close as possible to the point where the signals enter the cabinet in order to
prevent noise propagating to other electronics. The SPDs should also be grounded appropriately. Figure 19
shows how the SPDs should be installed.
Figure 19: FT702LT/D analogue interface surge protection
The supply pair [24VDC / 0VDC] is electrically isolated from the other lines and the chassis. The four current
loop signals are isolated from the power supply lines and the chassis. An example of SPD suitable for this
protection can be sourced from Phoenix Contact as shown in Figure 20 below. Users are responsible for
ensuring the suitability of these components for their application.
Manufacturer
Type
Manufacturers part number
PSU lines
Phoenix Contact
Surge protection plug (x1)
2819008 PT PE/S+1X2-24-ST
Base element (x1)
2856265 PT PE/S+1X2-BE
Current Loop Lines
Phoenix Contact
Surge protection plug (x2)
2856058 PT 1x2-24AC-ST
Base element (x2)
2856113 PT 1x2-BE
Figure 20: Typical SPD configuration used to protect sensor
