4.6 WATCHDOG CONNECTIONS
These should be wired with 1 mm PVC insulated multi-stranded copper wire terminated with M4 ring terminals.
The wir
e should have a minimum voltage rating of 300 V RMS.
4.7 EIA(RS)485 AND K-BUS CONNECTIONS
For connecting the EIA(RS485) / K-Bus ports, use 2-core screened cable with a maximum total length of 1000 m or
200 nF total cable capacitance.
A typical cable specification w
ould be:
●
Each core: 16/0.2 mm
2
copper conductors, PVC insulated
●
Nominal conductor area: 0.5 mm
2
per core
● Screen: Overall braid, PVC sheathed
To guarantee the performance specifications, you must ensure continuity of the screen, when daisy chaining the
connections. The device is supplied with an earth link pack (part number ZA0005092) consisting of an earth link
and a self-tapping screw to facilitate this requirement.
The earth link is fastened to the Midos block just below terminal number 56 as shown:
Figure 163: Earth link for cable screen
Ther
e is no electrical connection of the cable screen to the device. The link is provided purely to link together the
two cable screens.
4.8 IRIG-B CONNECTION
The optional IRIG-B input uses the same terminals as the EIA(RS)485 port RP1. It is therefore apparent that RS485
communications and IRIG-B input ar
e mutually exclusive.
A typical cable specification would be:
●
Each core: 16/0.2 mm
2
copper conductors, PVC insulated
●
Nominal conductor area: 0.5 mm
2
per core
● Screen: Overall braid, PVC sheathed
Chapter 18 - Installation P24xM
390 P24xM-TM-EN-2.1
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