4.5 VOLTAGE TRANSFORMER CONNECTIONS
Voltage transformers should be wired with 2.5 mm
2
PV
C insulated multi-stranded copper wire terminated with M4
ring terminals.
The wire should have a minimum voltage rating of 300 V RMS.
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.
To guarantee the per
formance specifications, you must ensure continuity of the screen, when daisy chaining the
connections.
Two-core screened twisted pair cable should be used. It is important to avoid circulating currents, which can cause
noise and interference, especially when the cable runs between buildings. For this reason, the screen should be
continuous and connected to ground at one end only, normally at the master connection point.
The K-Bus signal is a differential signal and there is no signal ground connection. If a signal ground connection is
present in the bus cable then it must be ignored. At no stage should this be connected to the cable's screen or to
the product’s chassis. This is for both safety and noise reasons.
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
4.8 IRIG-B CONNECTION
The IRIG-B input and BNC connector have a characteristic impedance of 50 ohms. We recommend that
connections between the IRIG-B equipment and the pr
oduct are made using coaxial cable of type RG59LSF with a
halogen free, fire retardant sheath.
4.9 OPTO-INPUT CONNECTIONS
These should be wired with 1 mm
2
PV
C 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:
Prot
ect 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.
Chapter 20 - Installation P14x
482 P14xEd1-TM-EN-1
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