La Marche AUPS-2K-A1-ABD1-24V150A, Installation And Operation Manual

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4.3 Troubleshooting Chart – Rectifier Section
Isolate from all power sources prior to performing any interior verifications or part replacements.
Symptom Possible Cause Action
1
Rectifier AC Breaker Trips
Incorrect AC Input Voltage
Measure AC voltage and verify against
AUPS nameplate.
AC Input Taps on Power Transformer
Set Incorrectly
Verify tap settings using AUPS
schematic or input table found on
AUPS.
AC-DC Short/AC-Ground Short/DC-
Ground Short
Refer to Section 4.3.1.
High DC Output Voltage Refer to Symptom 4.
Shorted Power Diodes/Diode Modules
(SD1)
Refer to Section 4.3.3.
High DC Voltage Shutdown Set
Incorrectly
Refer to Section 4.1.2.
Open Gate or Wire on Triac TR-1 Refer to Section 4.3.2.
2
Battery DC Breaker Trips
Shorted Power Diodes/Diode Modules
(SD1)
Refer to Section 4.3.3.
Shorted Battery Cells or Customer
Equipment
Remove all loads and batteries from
AUPS and confirm AUPS functionality.
Shorted Output Cables Inspect DC cables for shorts.
Defective Filtering Capacitors Refer to Section 4.3.4.
Loose Connections on DC Breaker
Inspect DC cable connections and
assure proper insertion.
Incorrect Battery Connected
Measure battery voltage and verify
against AUPS nameplate.
3
Low Output Voltage or Current
No AC Input Voltage Applied Measure and confirm input voltage.
Incorrect Battery Connected
Measure battery voltage and verify
against AUPS nameplate.
Incorrect, Damaged or Loose
Cable/Harness Connections Visually inspect and verify all internal
wiring using AUPS schematic.
Incorrect Float/Equalize Voltage
Settings
Refer to Section 3.6.1.1 for output
adjustment instructions.
Low Output Voltage Condition:
AUPS is in Current Limit
Measure output current and verify
against AUPS nameplate. If found to be
in current limit, wait for batteries to
charge or remove loads.
Low Output Current Condition:
Batteries are Fully Charged
Confirm by changing to Equalize mode;
current should increase.
Defective Power Diodes/Diode
Modules/Triac
Refer to Section 4.3.3.
Defective S2A-341S Control Board
Contact La Marche Service Department
for further troubleshooting instructions.
Defective Shunt
Defective Resonating Capacitor(s) Refer to Section 4.3.4.
Defective Batteries Check battery cells.