Man-1078_Sigma_CP_22
Page 21 of 24
21. Power supply
The control panel requires a 230V (+10%/-15%), 50/60Hz, AC mains power supply which connects to the
fused terminal block labelled “230V”.
The fused terminal block contains a 20mm, F1.6A L250V fuse which should only be replaced with a similar
type.
The output voltage of the power supply is 28V DC +/- 2V and the total current rating including a maximum
0.7A for battery charging is 3 Amps. Fuse F12 mounted on the circuit board is a self-resetting electronic fuse
rated at 4 Amps.
The incoming mains cable should be routed well away from other lower voltage wiring by a distance of at
least 50mm.
Mains wiring should include an earth conductor which is securely bonded to the building earth and should
enter the enclosure as close as possible to the mains terminal block. Mains wires should be kept very short
inside the enclosure and secured together close to the mains terminal block with a cable tie.
The control panel can accept sealed lead acid rechargeable batteries of up to 7Ah maximum capacity (see
table 2 for battery size required for each model).
The maximum current drawn from the batteries when the main power source is disconnected is 3 Amps.
Battery leads are supplied wired to the PCB along with a link to connect the two batteries in series. The PCB
is fitted with a 20mm, 3.15A T1 glass fuse (F13) in the battery charging circuit which must only be replaced
with one of the same type.
It is most important that the polarity of the batteries is carefully observed when connecting.
When the batteries are discharged to a level at which a low battery indication is given, the BATT FAIL
indicator will also be lit.
Wrongly connected batteries could cause damage to the control panel.
Caution: RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS.
Figure 9 – Mains and battery connections
1B
N
N
L
L
E
+
-
+
-
GREY LINK
BLACK BATTERY
LEAD TO -
TERMINAL
RED BATTERY
LEAD TO +
TERMINAL
MAINS
TERMINAL
KEEP MAINS WIRES AS SHORT AS POSSIBLE
AND SECURE ALL THREE WIRES CLOSE TO
THE TERMINAL BLOCK WITH A CABLE TIE
Summary of Contents for Sigma CP K Series
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