Goodrive3000 series medium voltage VFD
PROFIBUS communication
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9.3.2 Electrical installation
Node selection
The node address of a device is unique on a PROFIBUS fieldbus. The node address is a two-digit number, ranging from
00 to 99.
You can change a node address during operating, but the change takes effect only after re-initilization.
Bus terminator
Each segment has a bus terminator at the head and one at the tail to ensure that the operation runs without errors. The
dual in-line package (DIP) switch on EC-TX103 communication card is used to connect to a bus terminator. The bus
terminator prevents signal reflection at the bus cable end. If the communication card is the last communication card or the
first communication card in the network, the bus terminator must be set to ON. If you use a PROFIBUS D-sub connector
with a built-in terminator, the EC-TX103 communication card terminator must be disconnected.
Fieldbus terminator is off
Fieldbus terminator is on
Figure 9-3 Bus terminator
Bus network connection
Shielded twisted copper wire (conform to RS-485 standard) transmission is one of the most common PROFIBUS
transmission means.
The basic characteristics of transformation technology:
Network topology: Linear bus with one active fieldbus terminal resistor on each end
Transmission rate: 9.6k bit/s
–12M bit/s
Media: Shielded or unshielded twisted-pair cables, depending on the EMC environmental conditions
Number of nodes: 32 on each network segment (without repeater); a maximum of 127 (with repeaters)
Plug connection: 9-pin D-type plug. The following figure shows the pins of the connector.
1
2
3
4
5
9
8
7
6
Figure 9-4 Connector pins
The connection pins are described as follows when PROFIBUS is used.
Connector pin
Description
Connector pin
Description
1
-
Unused
2
-
Unused
3
B-Line
Data+ (twisted pair 1)
4
RTS
Request sending
5
GND_BUS
Isolation ground
6
+5V BUS
Isolated power supply of 5 V
DC
7
-
Unused
8
A-Line
Data- (twisted pair 2)
9
-
Unused
Metal
housing
SHLD
PROFIBUS cable shielding
line
+5V and GND_BUS are bus terminators. Some devices, such as the optical transceiver (RS485), may need to obtain
power through these pins.