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ID-E270-011GB
The MZ-48 power supply module has output terminal blocks for the following voltages:
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24 V - control panel operating voltage;
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27 V - insulated voltage to supply detection lines;
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5 V - electronic circuits supply voltage;
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24 V - internal equipment supply voltage protected with a B2 /1 A fuse.
Moreover, the MZ-48 has input terminal blocks to connect the following elements:
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AC power adaptor (+ 30 V);
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battery cluster (AK) protected with a B1/6.3 A fuse;
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temperature probe (PROBE).
The MZ-48 power supply module is equipped with the following protection, monitoring and signalling
circuits:
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230 V/50 Hz voltage monitoring circuit – "mains OK" LED is lit;
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+ 5 V power adaptor correct operation indication - green "5 V OK" LED is lit;
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battery recharging indication - green "CHARGING" LED is lit;
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battery efficiency control circuit - faults indicated by the yellow "BATTERY FAULT" LED;
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control panel ground fault indication - yellow "EARTH FAULT" LED is lit;
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voltage decrease detection circuit - when the battery voltage drops below 22 V ± 1 V.
Such conditions as loss of mains voltage, loss of battery cluster voltage or fuse failure are also
indicated on the TSO-4900 board – the collective "FAULT" diode is lit, "POWER" diode blinks and an
acoustic signal is emitted. The fault indication messages may be accessed by pressing the "FAULT"
push button, in accordance with the programming manual (PM).
