Building Automation
Industrial Automation
Power Automation & Safety
Bangladesh Distributor
Question
The output voltage decreased while Power Supplies are in use. What is the cause of the problem and solution?
Answer
| Symptom | Cause | Solution | |
| Operation | Output from the Power Supply has stopped. | Surge or other overvoltage has been applied externally (e.g., load) to the output side, activating overvoltage protection. | Add a varistor and diode to the source of the surge, and make sure that overvoltage is not applied to the Power Supply's outputs. |
| The incorrect input voltage (applying 100 V when the setting is 200 V) has been applied. (If 100 V is applied when the voltage is set to 200 V, although damage will not occur immediately, damage will occur if use is continued.) | Make sure that the input voltage is the same as the voltage set using the selector terminals. The internal circuits may be damaged. Replace the Power Supply. | ||
| Output from the Power Supply has stopped (close to source of vibration or shock). | Cracks have occurred in the internal soldering due to vibration in the operating environment, preventing electrical conduction. (The vibration and shock are particularly close to the contactor.) | If vibration occurs during operation, check the installation location and reduce vibration or consider inserting vibration-proof rubber between the Power Supply and its mounting surface. | |
| Output from the Power Supply has stopped (close to source of strong, high- frequency noise). | Damage has occurred due to impulse from the input line. | If impulse occurs in the input line, separate the Power Supply's input line from the source of the impulse. If separation is not possible, connect a varistor either to the source of the noise or to the Power Supply's input terminals. Also incorporate a fuse that will provide protection if the varistor is short-circuited and damaged.  | |
| Longterm use | Output from the Power Supply has stopped (the fan has stopped). | The fan's life has expired, preventing forced cooling, and the internal temperature has risen activating overheating protection. | Perform periodic maintenance on the forced cooling fan and replace the fan promptly if any fault in the fan is found. |
| The fan bearings have been worn down due to the operating environment (e.g., dust or dirt). | Perform periodic maintenance on the forced cooling fan and make sure that there is no dust or dirt present in the operating environment. | ||
| The output is unstable. | The terminals have become loose. | Retighten the terminals to the specified torque. | |
| The output drops. | The life of the internal components has expired. | The service life of the Power Supply's built-in electrolytic capacitor depends on the ambient temperature and load rate, and its structural life depends on the operating environment (vibration, shock). Replace the Power Supply together with other Power Supplies that were purchased at the same time. | |
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The output indicator turns ON, but then turns OFF immediately. What is the cause of the problem and solution (in models equipped with the overvoltage protection function)?
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