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Emerson SP2403 not turning on repair

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Revision as of 05:52, 15 June 2024 by ASRepairs (talk | contribs)
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Emerson SP2403 not turning on repair
Device Emerson SP2403
Affects part(s) D18 diode (PR 1600)
Needs equipment multimeter, soldering iron, soldering station.
Difficulty ◉◉◉◌ Hard
Type Soldering



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

Location of D18 diode and the TR18 MOSFET (Figure 1)

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.