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4.2
Troubleshooting Procedure
Troubleshooting should be performed only by trained service personnel or experienced electricians. Before setting
up any complicated testing or making any conclusions, inspect the inverter using the guide below.
Check the following:
1. Check AC output cables, connections, battery type, and number of cells against the inverter's rating.
2. Check input connections, input voltage and breaker size.
3. Check for shipping damage, loose connections, broken wires, etc.
4. Check the DC input cables to make sure they are proper polarity and secure. The DC voltage input must be
above 1.73 volts per cell (lead acid) and 1.1 volts per cell (nickel cadmium).
5. Check the AC bypass line connections to make sure they are proper and secure. Total load must not exceed
the nameplate rating.
6. Certain failures can be caused by defective batteries and user loads; make sure batteries and loads are free
from defects.
NOTE: If the problem is found to be located in the printed circuit boards, the board should be replaced. No
attempt should be made to repair circuit boards in the field.
La Marche Service Technicians are available to help with troubleshooting or with scheduling inverter service.
When calling for a service inquiry or for troubleshooting assistance, be sure to have all of the following information
on hand:
1. Equipment model number and serial number.
2. The measured DC input voltage and AC bypass voltage (if applicable).
3. The measured AC output voltage, with and without the loads.
4. Result of the check of the AC and DC breakers.
5. The AC output current and voltage, measured with load connected to inverter.
NOTE: When ordering replacement parts, drawings, or schematics, provide the model number, serial number,
and description of problem, if available.
La Marche Phone Number: (847) 299-1188
24-hour Emergency Number: (847) 296-8939
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Table of Contents
Troubleshooting
