Siemens SIGMASYS C, Manual

Page: 80 / 138

11 Power supply
To increase capacity levels, a maximum of two battery sets can be connected in
parallel.
The parallel-connected battery sets must be from the same series and have the same date of
manufacture.
The batteries must not be installed in different cabinets with different interior temperatures
(e.g. 1 set in the SIGMASYS C control and indicating panel and 1 set in the battery cabinet).
To be covered by the power supply unit installed:
a) the calculated power supply
The power supplied by the electrical mains must guarantee unlimited operation by the sys-
tem. It must also be able to supply the recharging current for the batteries during normal
system operation.
b) the battery recharging current
The charging unit must be set in such a way that the final voltage of the discharged battery
can recharge in max. 24 hours to 80% of its nominal capacity. The charging operation must
be concluded within 72 hours at the latest.
The recharging current lW is calculated using the formula:
I
W
= K
N
/ 24 [A]
K
N
= nominal capacity of the selected battery
Note:
The total of the current requirement values calculated and the value of the recharging current
must notexceed the maximum current supplied by the power supply unit. Otherwise, two
power supply unitsmust be used.
11.7 Power supply unit for the peripheral transponder/indicator panel
To avoid interference from the peripherals (line network), a separate mains supply and batter-
ies should be provided to power the peripherals.
The line network must be specially calculated for the power supply to the peripherals (trans-
ponder/ indicator panel).
Wires 3 and 4 in the existing 2 x 2 x 0.8 cable can be used for short distances and low cur-
rents.
N.B.: observe the voltage at the terminals in the loop/spur ( see section
“ Monitored lines ” on page 77). Minimum control and indicating panel voltage is 22 V.
(Transponder: the minimum 21 V voltage leads to a voltage drop dU = 1 V.)
(Indicator panel: the minimum 18 V voltage leads to a voltage drop dU = 4 V.)
72 / 128 BMT Project Planning Guidelines
Best.Nr. A24205-A337-B970 – Edition 12 (03/07)