Siemens EF 775 Series Instruções de Operação descarregar pdf (Página 10)

Mounting notes

You must mount the central communication unit in a cabinet or control panel. Make

sure service can easily access the unit.

• Standard mounting On standard rail TH 35-7.5

• Screwed-on mounting Screwed to rear wall

• Mounting position Horizontal only

• Mounting and dimensions See "Dimensions"

Installation notes

Important notes

Observe the following important notes for mounting and installation:

• The central communication unit must

be mounted in a cabinet or control panel,

as when mounted on a freely accessible wall, the relay output terminals

carrying mains voltage (bottom of the unit, terminals not covered) are not

protected against electric shock hazard.

• Run fuses, switches, wiring and earthing as per local regulations for electrical

installations.

• The relay contacts of the central communication unit can switch either mains

voltage or

low-voltage. Applying both mains and low voltage is not permitted.

• You must connect circuits with relay contacts Q11, Q12 through Q41, 42 to the

same mains phase.

• You must connect circuits with relay contacts Q73, Q74 and Q83, Q84 to the

same mains phase.

• Connect only potential-free contacts to digital inputs D1…D8 and universal

inputs X1…X8 (configured for digital inputs signals).

• We do not recommend plant monitoring via PC interface in environments with

strong electromagnetic interference (e.g. in industrial environments with

electrical welding equipment).

Operating voltage The central communication unit operates on AC 24 V and must meet requirements for

SELV/PELV (safety extra low-voltage / protective extra low-voltage).

Use only safety isolating transformers suited for 100 % duty (as per

EN 61558-2-6).

Wiring Plan sufficient space around the unit for easy wiring. The unit’s terminals are arranged

to eliminate cross-wiring of input and output lines to prevent faulty wiring to the greatest

extent possible.

The terminals for digital inputs, universal inputs, and the KNX bus are located at the top

of the unit (low-voltage side). The terminals for AC 24 V operating voltage and relay

outputs carrying mains voltage are located at the bottom (mains voltage side).

The terminals are designed for wire diameters of min. 0.8 mm or cross-sections of

0.5...2.5 mm

. See "Technical data".

Connecting terminals

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Building Technologies Central communication unit OZW775 V3.0 CE1N5663en

HVAC Products 29.06.2009

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