The DC bus voltage monitoring device mainly reflects the level of the DC power supply voltage.
KV1 is a low voltage monitoring relay with normal voltage KV1 excitation, and its normally closed contact is disconnected. When the voltage decreases to the fixed value, KV1 loses the magnet, its normally closed contact is closed, HP1-light card is bright, issuing audio signal.
KV2 is an overvoltage relay. At normal voltage, KV2 is lost magnetic, and the normally open contact is in the open position. When the voltage exceeds the set value, the normally open contact is closed and the HP2-light card is bright, giving a sound signal.
Schematic diagram of the DC bus voltage monitoring device
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