Problem with DCS voltage query
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DCS refers to the Guodian Zhishen NT system, and the DI card uses 48VDC. After removing all the DI cards, the 48V output from the power supply results in a voltage of 0V at the positive terminal and -48V at the negative terminal with respect to the cabinet. In the existing electrical cabinet, the voltage at the positive terminal is over 100V with respect to the cabinet, while it is over 50V at the negative terminal; the voltage difference remains 48V. Is there any risk in operating in this condition for an extended period? How can this issue be diagnosed? Could someone with more experience give me some advice?
Check the ground and neutral connections; first eliminate the voltage between neutral and ground. This voltage is too high – it’s usually just a few volts. The DC circuit should be grounded separately; it seems that yours is connected to the electrical ground
You must find that there is some other electricity flowing into the circuit. In other words, there are two power supplies now. Prolonged use will definitely cause damage to both power supplies.