Siemens manual Power supply, Control unit FC700A, Loop C-Bus, EN54 requirements

Control terminal B3Q700 (FC/FT)

12.5Connection lines between control unit and external operating units

Control terminal FT700A	Control terminal
Options	FT700A
B3R051 (Parallel indicator panel)
E3I040 (LON module)
Printer

2…11
leads	Loop C-Bus

max. 1000m per loop with ∅0,6mm G51 (incl. return line) max. 1400m per loop with ∅0,8mm G51 (incl. return line)

Control unit FC700A

When planning a system the following condition must be complied with:

At least one operating unit must comply with standard EN54, i.e. it must be equipped with emergency operation and emergency power supply.

EN54 requirements:

Communication as loop line -> design C-Bus as a loop line Operating units also with emergency operation -> 3 additional wires Second de-coupled 24V supply -> 3 additional wires or autonomous power supply

The number of wires in the connection cable depends on the application and the distances between the stations:

Application	C-Bus	24V supply	Emergency power	Emergency opera-	Number of wires
			supply	tion circuit
24V supply from	✔	✔	✔	✔	11
control unit
	(2 wires)	(3 wires)	(3 wires)	(3 wires)
EN54 complied with
24V supply from
control unit without	✔	✔			5
emergency operation
	(2 wires)	(3 wires)
and emergency
power supply

Note:

–Emergency operation circuit required including between CPUs or for a sepa- rately connected Gateway

–Emergency operation circuit and emergency supply are not designed as a loop line

–Emergency supply via separate cable or C-Bus feedback

12.6Power supply (24V)

Operating unit B3Q700 is designed for the voltage range 18...45VDC

The maximum current at 24V is 400mA

Max. Length of line (approximate):

–For cables ø 0.8mm -> 180m

–For cable cross-section 1mm2 -> 360m

	The current consumption for the options (parallel indicator panel, LON-module)
	must be taken into account separately
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Siemens Building Technologies	007836_a_en_--.doc
Fire & Security Products	03.2004