Danfoss VLT AQUA Drive FC 202 Посібник з монтажу - Сторінка 11

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Danfoss VLT AQUA Drive FC 202 Посібник з монтажу

Installation

1 2

PROFIBUS Option A

Code No. 130B1100

8 7 6 5 4 3 2 1

SW. ver. XX.XX

Termination switch

Address switches

Illustration 3.7 Location and Sequence of the Address Switches

3.7 Electrical Installation

3.7.1 Cabling Requirements

•

Terminate the nodes at the physical ends of each

segment. If the bus segment is branched, the

device furthest from the segment connector

represents the end of the segment.

•

Terminals 66 and 67 provide a 5 V DC supply,

available for external termination.

NOTICE

The PROFIBUS D-sub 9 adapter also features a

termination switch. When the D-sub 9 adapter is used,

set the termination switch on the fieldbus option to OFF,

to avoid double termination.

NOTICE

When the fieldbus is extended with a repeater, terminate

the extension at both ends.

NOTICE

To avoid impedance mismatch, use the same cable type

throughout the entire network. Refer to

chapter 3.7.2 Cable Specifications for cable specifications.

MG33C602

Installation Guide

Termination

OFF

Address

3.7.2 Cable Specifications

135–165 Ω

Impedance at a measuring

frequency from 3–20 MHz

<110 Ω/km

Resistance

Capacitance

<30 pF/m

Damping (total wire length)

Maximum 9 dB over the whole

wire length

Cross-section

Maximum 0.34 mm

Cable type

Twisted in pairs, 1 x 2, 2 x 2, or

1 x 4 wires

Screening

Copper-braided screen, or braided

screen and foil screen

Table 3.2 Cable Specifications

, AWG 22