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Emerson SP2403 not turning on repair

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Revision as of 12:37, 10 June 2024 by ASRepairs (talk | contribs) (Created page with "{{stub}} {{Repair Guide |Device= |Affects parts= |Needs equipment= |Type= |Difficulty= }} ==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 thumb|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 measur...")
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Emerson SP2403 not turning on repair
Device
Affects part(s)
Needs equipment
Difficulty
Type


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.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.

Diagnostic Steps

Repair Steps