Voltage Transformer Connections; Watchdog Connections; Eia(Rs)485 And K-Bus Connections; Irig-B Connection - GE P642 Technical Manual

Chapter 18 - Installation
4.5

VOLTAGE TRANSFORMER CONNECTIONS

Voltage transformers should be wired with 2.5 mm
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 performance 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
●
Nominal conductor area: 0.5 mm
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 product 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
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:
Protect 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.
400
2
PVC insulated multi-stranded copper wire terminated with M4
2
copper conductors, PVC insulated
2
per core
2
PVC insulated multi-stranded copper wire terminated with M4 ring terminals.
P64x
P64x-TM-EN-1.3