Danfoss VACON OPTE3, Руководство по установке

Страница: 53 / 64

Table 16: The Bus Connector Signals
Signal Connector Description
A1 21 Data
A2 22 Data
0 Shield 23 Shield
6.4.2 The Jumpers in the OPTC4 Option Board
To make sure that data is transmitted correctly, network segments must be terminated. One or two terminations are necessary de-
pending on the network type. A free topology network segment requires only one termination whereas a doubly terminated bus
topology requires two.
The jumper X5 on the option board must be set accordingly. Use the termination resistance of 94 Ω when only one termination is
needed and 47 Ω for two terminations. The bus termination settings for the jumper X5 are shown in the following figure.
1
A
B
C
2 3
1 2 3
1 2 3
e3
0b
i0
78
.1
0
A 47 Ω
B 94 Ω
C No termination
Illustration 41: The Settings of the Jumper X5, Bus Terminal Resistor, Positions A, B, and C
Unlike other option boards described in this manual, OPTC4 does not have jumpers to control cable shield grounding. The cable
shield of OPTC4 is always connected to ground through RC circuit. It means that direct shield groundings and/or shield disconnect-
ing (that is, cutting) must be done externally.
6.4.3 The OPTC4 Option Board Topologies
LonWorks networks can be implemented on many different physical media. The OPTC4 option board has an FT-X1 transceiver sup-
porting the Free Topology transformer coupled network. It makes it possible for the network cable to be connected as bus, star, or
loop topology, or a combination of these topologies. This medium has a maximum bit rate of 78 kbit/s. The FT-X1 transceiver is
compatible with Echelon’s LPT-10 Link Power transceiver, and these transceivers can communicate with each other on a single twis-
ted-pair cable.
A A
e3
0b
i0
66
.1
0
A The termination
Illustration 42: Doubly Terminated Bus Topology
A
e3
0b
i0
67
.1
0
AN338644703080en-0002 / DPD02156 | 53 Danfoss A/S © 2022.08
CAN Type and Other Fieldbus
Option Boards
VACON® RS485 and CAN Bus Option Boards
Installation Guide