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A certain type of equipment including DC and AC two power supply ways, DC power supply is vital when there is no AC power. In this paper, a malfunction which is encountered in the process of DC power supply for such type of equipment is analyzed and excluded, from the analysis of such malfunction, we can see the relay is used more in the process of DC power supply, is an important component, and is easily to break down, is the key point for us to exclude the malfunction. KEYWORD: Power Source System; DC Power Supply; Malfunction; Relay X2 X5 International Conference on Industrial Technology and Management Science (ITMS 2015) © 2015. The authors Published by Atlantis Press 443 (3) 24 V DC voltage → pin 1 and pin 2 of X2 →switch K5 → V2 → X3 / 1 → providing 24V DC voltage to supply electrical equipments with needs of DC power. Fig. 2 control circuit of DC power supply system The working process of DC power supply is relatively simple from analysis of the electronic circuit, but the above malfunction symptom is a kind of rare problem and never happens before. The malfunction is possibly caused by power input, or electronic circuit, or switches, or electric relay, or triodes that control the electric relay. The actual cause for such a fault will be illustrated in the troubleshooting part.

A Malfunction Example of DC Power Supply of the Power Source System in a Certain Type of Equipment