Advantech RS-485 Manual de usuario descargar pdf (Pagina 339)

100

101

ADAM-5000 F-7

Appendix F

1.4 Wire impedance

Figure F-5: The purpose of high voltage transmission

• What’s the purpose of high voltage transmission?

We can see the high voltage tower stand at suburban. The power plant

raises the voltage while generating the power, then downs the voltage

when transmits the power to power station. What’s the purpose of

high voltage transmission do you think? According to the energy

formula, P = V * I, so the current will be reduced while raising the

voltage. Besides, as you know that each cable has the wire impedance.

So, referring to Ohm rule (V = I * R), this decreased current makes the

low power consumption. So the high voltage transmission just for

reducing the power consumption.

Figure F-6: wire impedance.

ADAM 5000/485

T/B

P/S

Grounding Bus

Copper mesh for Shielding

(should be grounded only on one end)

Connect to ground bar on the factory.

The ground bar should have a resistance below 5 ohm.

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Advantech RS-485 Manual de usuario Pagina 339

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