Siemens EF6 Series Manual do Utilizador descarregar pdf (Página 22)

Coupling modules are available either with relays or

semiconductors. Semiconductor couplers offer some

significant advantages: The electronic components

are extremely reliable and have a very long service

life (refer to the diagram below). The input coupler

combines the best of both worlds – improved technical

features and a lower price. When considering output

couplers, the question of “relay or semiconductor”

needs to be taken into account as well as the mak-

ing/breaking capacity and the number of operating

cycles. If a relay has to be replaced just once during

the complete lifetime of a machine, then a semiconduc-

tor coupler will have paid for itself.

Your advantages:

• Reliable input couplers with semiconductor output

• Graduated series of output couplers with semiconductors

• Extremely long electrical life

• Extremely high contact reliability

• High DC making/breaking capacity

• Short switching times

Applications:

• Providing electrical isolation, converting voltages

• Switching DC loads

• Switching capacity loads

• High number of switching cycles

• Overvoltage and EMC protection of controls

Lebensdauervergleich

Coupling Relays – Narrow Design

3TX70 Semiconductor Couplers

Electronic coupling modules have a significantly higher lifetime

than electromechanical devices.

Electronic control

Semiconductor

coupler

Motor

contactors

Actuators

24 V DC

Input Output

Use of semiconductor couplers Comparison of lifetimes

High

Lifetime

Average

Low

Probability of failure

Start of wear for

mechanical

components

Probability of

failure for

electronic

components

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 31 32

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