Samlex America SCC-30AB - Manuel (Page 48)

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TroubleshooTing
SyMPTOM 1. BATTERy IS NOT CHARGING
• Check the Status LED (2, Fig 5.1). This should be ON if it is daytime.
• Check that proper Battery Charging Algorithm (Program) has been selected by DIP
Switches 2, 3, 4 (Table 6.1).
• 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 confirm 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 drops 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 V) 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.
SyMPTOM 2. Battery Voltage IS TOO HIGH
• The Status LED (2, Fig 5.1) will be blinking Green at 5 blinks and the Battery Voltage will be
displayed on the LCD Display (Screen 1, Fig. 5.3)
• First check operating conditions to confirm that the voltage is higher than specifications.
• Check that proper Battery Charging Algorithm (Program) has been selected by DIP Switches
2, 3, 4 (Table 6.1).
• Check that all wire connections in the system are correct and tight.
• Disconnect the PV array and momentarily disconnect the lead from the Battery Positive
terminal BAT+. Reconnect the battery terminal and leave the PV array disconnected. The
Green charging light should not be lit. Measure the voltage at the PV array terminals PV+
and PV- (with the array still disconnected). If the Battery Voltage is measured at the PV array
terminals PV+ and PV- , the controller may be damaged.
• Disconnect the PV array. The Status LED will continue to blink Green and the Battery Voltage
will continue to be displayed (Screen 1, Fig. 5.3).
• Check the Open Circuit Voltage of the PV array. It should match the specs for the array and
should be less than 50V.
• With the PV array disconnected, there should be no voltage reading on the PV+ and PV-
terminals. If voltage on the PV+ and PV- terminals reads almost equal to the Battery Voltage,
the controller is defective.