Yaskawa 260IF DeviceNet System Bedienungsanleitung PDF herunterladen (Seite 77)

Wiring

7.1.3

Methods for Deciding the Power Supply Positioning

7-4

or the simple calculation from the graph.

Make sure that each drop line meets the conditional expression for the length and current

capacity of the drop line, as outlined in item 6 of 7.1.1 Basic Precautions.

1 Have separate communications and internal circuit power supplies whenever possible.

2 If the same power supply must be used for both communications and internal circuit power supplies,

the method of simple calculation from the graph cannot be used. Always use the calculation from the

formula method.

 Simple Calculation from the Graph

Simple Calculation

The voltage in the communications power supply section of each node must be 11 VDC or

higher. The communications will become unstable if the voltage is lower than 11 VDC.

Voltage drop will occur when current flows through the transmission cable. This voltage

drop will increase the longer the transmission cable and the larger the current.

The following table shows the maximum current for each cable to allow sufficient voltage to

be supplied to the communications power supply section even if voltage drop occurs.

• For thick cables

• For thin cables

INFO

Distance

(m)

0 25 50 100 150 200 250 300 350 400 450 500

Max.

current (A)

8.00 8.00 5.42 2.93 2.01 1.53 1.23 1.03 0.89 0.78 0.69 0.63

100

150

200

250 300 350 400 450

500

Max. current (A)

Distance (m)

Distance

(m)

0 10 20 30 40 50 60 70 80 90 100

Max.

current (A)

3.00 3.00 3.00 2.06 1.57 1.26 1.06 0.91 0.80 0.71 0.64

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 94 95

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Yaskawa 260IF DeviceNet System Bedienungsanleitung Seite 77