d&b audiotechnik D12 Hardware Manual

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d&b audiotechnik D12 Hardware Manual Manual pdf 10 page image

3.6. Power supplyThe D12 utilizes an autosensing switch mode power supply for mainsvoltages 115/230 V, 50 – 60 Hz (Optional 100/200 V) andovervoltage protection.Where voltages outside of this range are present, a self-resettingprotective circuit responds quickly to isolate the internal amplifier powersupply leaving only a supervisory circuit to monitor the mains voltage.The display will clearly indicate the fault and voltage value.The supervision circuit is self-resetting.The associated voltage ranges and/or the guaranteed (nominal)operating ranges are listed in the following table.Voltage range Status0 – 98 V Undervoltage98 – 134 V 110/115/120 V operation134 – 195 V Undervoltage195 – 265 V 220/230/240 V operation265 – 400 V OvervoltageTab. 2: Voltage ranges 115/230 VTo prevent the D12 from cycling on and off with fluctuating mainspower supply voltages, the switching thresholds are delayed and about4% apart from the border of the voltage range (hysteresis).Voltage range Status0 – 85 V Undervoltage85 – 117 V 100 V operation117 – 170 V Undervoltage170 – 234 V 200 V operation234 – 400 V OvervoltageTab. 3: Voltage ranges 100/200 VD12 Amplifier, Hardware manual (4.4 EN) Page 10 of 28