Mains Supply; Earthing; Power Supply; Battery - Siemens SIGMASYS C Manual

11 Power supply

11.1

Mains supply

A separate electric circuit with individual, specially identified fuses must be used for the power
supply from the electrical mains.
The control and indicating panel is to be connected to a mains distribution cabinet via a con-
ductor cross section of at least 3 x 1.5 mm
series in the distribution cabinet.
The fire alarm system can be operated at the following supply voltages:
Supply voltage
230 V +10 –15 %

Table 25: Mains supply

11.2

Earthing

SIGMASYS control and indicating panels have a "function and protection earth" (FPE) (VDE
0800, Part 2, Paragraph 6). A cross section of at least 6 mm
To avoid interference, the earth is to be placed at the buildings main earthing bus.
The H07V-K fine-strand wires should preferably be used
11.3

Power supply

VDE 0833 and VdS 2095 guidelines stipulate the need for two independent power sources for
supplying power to fire alarm systems. This is achieved by using the AC network as the po-
wer supply unit and batteries as the secondary power supply unit. The batteries are always
kept fully charged by the power supply unit (standby parallel mode).
A 24 V/150 W power supply unit V24230-Z6-A2 is installed in SIGMASYS C and
SIGMASYS M.
11.4

Battery

Two 12V/25Ah batteries connected in series can be used in the SIGMASYS C control and in-
dicating panel. The SIGMASYS battery cabinet can be used for larger batteries.
Batteries cannot be placed in the SIGMASYS M control and indicating panel.
A separate battery cabinet is provided for the batteries and each one takes 2 x 12 V 65 Ah
batteries.
If the batteries are not installed inside the control and indicating panel, they can be connected
via a battery connection line to the control and indicating panel. The conductor cross section
can be calculated using the following formula. A separate fuse (C24104-Z18-C277) is to be
inserted and mounted in the battery cabinet for every connecting line.
The power supply unit's temperature probe must be installed with the batteries.
Cross section calculated on the basis of
70 / 128
2 (NYM-J). A fuse (max. 16 A) is to be connected in
I max. 150W SV
1,2 A
Supply frequency
50 / 60 Hz
2
is to be used.
q = I max * L / χ * Δu = I max * L / 29
BMT Project Planning Guidelines
Best.Nr. A24205-A337-B970 – Edition 12 (03/07)