samlexsolar SCC-30AB - Troubleshooting; Fault Messages and Protections; Troubleshooting: Battery Not Charging

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TROUBLEShOOTING
The SCC-30AB is very rugged and designed for the most extreme operating conditions.
Most PV system problems will be caused by connections, voltage drops, and loads.
Troubleshooting the SCC-30AB controller is simple. Some basic troubleshooting
procedures are listed below.
Protections & Fault Messages on the LCD Display
The LCD displays might have the following fault messages when SCC-30AB stops
operating due to protections/system error:
Display Description Cause of Fault
Alarm: OC
Over Current
Over Current The current exceeds 45 A
Alarm: OT Heat Sink over temperature
Heat sink temperature
exceeds 90° C
Alarm: CPF00
Link Master error
Display Panel error
The CPU is not able to
exchange data with the
Display Panel
SYMPTOM 1. BATTERY IS NOT CHARGING
• Check the green LED indicator. The green CHARGING LED should be on if it is
daytime.
• Check that the proper battery charging algorithm (program) has been selected by
DIP Switches.
• Check that all wire connections in the system are correct and tight. Check the
polarity (+ and –) of the connections.
• Measure the PV array open-circuit voltage and conrm it is within normal
limits. If the voltage is low or zero, check the connections at the PV array itself.
Disconnect the PV array from the controller when working on the PV array.
• Check that the load is not drawing more energy than the PV array can provide.
• Check if there are excessive voltage drops between the controller and the
battery. This will cause undercharging of the battery.
• Check the condition of the battery. Determine if the battery voltage declines
at night with no load. If it is unable to maintain its voltage, the battery may be
failing.
• Measure the PV voltage and the battery voltage at the SCC-30AB terminals. If the
voltage at the terminals is the same (within a few tenths of volts) the PV array is
charging the battery. If the PV voltage is close to the open circuit voltage of the
panels and the battery voltage is low, the controller is not charging the batteries
and may be damaged.