4.9 OPTO-INPUT CONNECTIONS
These should be wired with 1 mm
2
P
VC insulated multi-stranded copper wire terminated with M4 ring terminals.
Each opto-input has a selectable preset ½ cycle filter. This makes the input immune to noise induced on the wiring.
This can, however slow down the response. If you need to switch off the ½ cycle filter, either use double pole
switching on the input, or screened twisted cable on the input circuit.
Caution:
Pr
otect the opto-inputs and their wiring with a maximum 16 A high rupture capacity
(HRC) type NIT or TIA fuse.
4.10 OUTPUT RELAY CONNECTIONS
These should be wired with 1 mm PVC insulated multi-stranded copper wire terminated with M4 ring terminals.
4.11 ETHERNET METALLIC CONNECTIONS
If the device has a metallic Ethernet connection, it can be connected to either a 10Base-T or a 100Base-TX
Ethernet hub
. Due to noise sensitivity, we recommend this type of connection only for short distance connections,
ideally where the products and hubs are in the same cubicle. For increased noise immunity, CAT 6 (category 6) STP
(shielded twisted pair) cable and connectors can be used.
The connector for the Ethernet port is a shielded RJ-45. The pin-out is as follows:
Pin Signal name Signal definition
1 TXP Transmit (positive)
2 TXN Transmit (negative)
3 RXP Receive (positive)
4 - Not used
5 - Not used
6 RXN Receive (negative)
7 - Not used
8 - Not used
4.12 ETHERNET FIBRE CONNECTIONS
We recommend the use of fibre-optic connections for permanent connections in a substation environment. The
100 Mbps fibr
e optic port is based on the 100BaseFX standard and uses type LC connectors. They are compatible
with 50/125 µm or 62.5/125 µm multimode fibres at 1300 nm wavelength.
4.13 USB CONNECTION
The IED has a type B USB socket on the front panel. A standard USB printer cable (type A one end, type B the other
end) can be used to connect a local P
C to the IED. This cable is the same as that used for connecting a printer to a
PC.
P24xM Chapter 18 - Installation
P24xM-TM-EN-2.1 391
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