La Marche A31 - Troubleshooting Chart

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4.3 Troubleshooting Chart
Isolate from all power sources prior to performing any interior verifications or part replacements.
Symptom
Possible Cause
1
Inverter AC Breaker Trips
Overload Condition
Shorted Equipment or Component on AC output
Defective AC Breaker
Shorted SCRs (if applicable)
2
Inverter DC Breaker Trips
Capacitor Pre-Charge Circuitry Improperly Used
Defective C1, C2, or C4 Capacitor
Defective S2A-167S Oscillator/Line Sync Board
Defective S2A-297/S2A-306 IGBT Drive Board
Defective IGBT Module
Shorted Wiring
Incorrect Battery Connected
Shorted Battery Cells
3
Lockout (No AC Output)
Low or No DC Voltage Input
Defective Inverter AC Breaker
Defective Inverter DC Breaker
Broken Wire
Shorted or Open C1 Capacitor
Low or High DC Voltage Shutdown Activated or
Improperly Set
Open F2 Fuse
Open Fuse on S2A-297/S2A-306 IGBT Drive
Board
4
F2 Fuse Clears
Defective S2A-167S Oscillator/Line Sync. Board
Defective S2A-297/S2A-306 IGBT Drive Board
5
Bypass AC Breaker Tripped
AC Bypass Line Overload Condition
Shorted SCRs (if applicable)
6
READY LED for Pre-Charge Circuitry Not
Illuminating
Defective C2 Capacitor
Defective READY LED
Improper Connection to S2A-172 Reverse Polarity
Board
No or Low DC Voltage Input
Inverter ON/OFF Switch set to ON
Defective IGBT Module
Defective C4 Capacitor
Open Pre-Charge Resistor
Defective Batteries
7
Inverter’s AC Load Supplied by Wrong Source
Defective SCR Module
Defective Static Switch
Overloaded Prime Source