Product Manuals/Man-1088_Sigma XT_26 Page 34 of 40
20. 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.
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 the
accessory pack.
It is most important that the polarity of the batteries is carefully observed when connecting.
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 20 – Mains and battery connections
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