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| Emerson SP2403 not turning on repair | |
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| Device | |
| Affects part(s) | |
| Needs equipment | |
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Problem description
Diagnosing and fixing an issue with an Emerson SP2403 inverter that does not turn on or react to power when connected to 3 phase 400V AC
Symptoms
- Not turning on.
- Not reacting to power.
- MOSFET gate switching for split second then stopping and repeating when measured with an oscilloscope.
- VCC for UC2844B going up to 16V then dropping to 7V and raising again on a loop.
Solution
Measure D18 diode in with a multimeter in diode mode. Make sure it measures 0.4-0.7V, anything less or more and it's dead. In this case it was 0.1V on both ways which indicates that it's dead. The original diode was a PR1600. A photoflash rectifier diode with 1600v reverse voltage. I've replaced it with a rectifying diode with 1kV reverse voltage and it started switching properly again and working.If the issue has a single, specific solution, provide it in this section and delete the sub-headers below. Otherwise, if there are multiple potential causes for the problem, outline the process of identifying the root cause and offer corresponding solutions below.