Watchdog Connections; Eia(Rs)485 And K-Bus Connections; Irig-B Connection; Figure 163: Earth Link For Cable Screen - GE P24DM Technical Manual

Chapter 18 - Installation
4.6

WATCHDOG CONNECTIONS

These should be wired with 1 mm PVC insulated multi-stranded copper wire terminated with M4 ring terminals.
The wire 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 would be:
●
Each core: 16/0.2 mm
●
Nominal conductor area: 0.5 mm
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

There 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 are mutually exclusive.
A typical cable specification would be:
●
Each core: 16/0.2 mm
●
Nominal conductor area: 0.5 mm
Screen: Overall braid, PVC sheathed
●
390
2
copper conductors, PVC insulated
2
per core
E01402
2
copper conductors, PVC insulated
2
per core
P24xM
P24xM-TM-EN-2.1