ABB PVS300, Руководство по эксплуатации продукта

Страница: 40 / 130

40 Planning the installation

Recommended cable type for remote control unit and I2I interfaces
over EIA/RS-485
Shielded twisted pair (STP) cable (for example Lapp Kabel UNITRONIC
®
LiHCH (TP)
or equivalent) is recommended. These interfaces do not require termination resistors.
The cabling distance is related to the data transfer velocity. The default baud rate for
the remote control unit and I2I link is 19.2 kBit/s.
The approximate cable distance without termination, using twisted pair cable,
24 AWG or conductor diameter of 0.5 mm (0.2 mm
2
) is shown in the following table.

Daisy-chaining of EIA/RS-485 transmission line
Daisy-chain networking topology is reliable and recommended in cases where
several PVS300 inverters are connected to Modbus or I2I over an EIA/RS485
transmission line.
When wiring a daisy-chain network to PVS300 terminals it is recommended to use
suitable crimped end-sleeves (diameter max. 2 mm) to join wires together for reliable
terminal connection.
Baud rate (bits/s) Distance (m)
1200 1200
2400 1200
4800 1200
9600 1200
14400 1120
19200 840
38400 420
57600 280
115200 140
2
Wire sleeves
Max. Ø 2 mm
Device 1
Dat
a +
Dat
a
-
Gnd_A
3 1 2
Device 2
Dat
a +
Dat
a
-
Gnd_A
3 1 2
Device 3
Dat
a +
Dat
a
-
Gnd_A
3 1 2
Device n
Dat
a +
Dat
a
-
Gnd_A
3 1