Solar Controller-SCM48100 User Manual
Chapter 3 Instructions to Maintenance
3.1 Preventive Periodical Maintenance
In order to improve the working reliability of solar controller, please complete the following
preventive maintenance operations:
1. Keep the environment sanitary and avoid dust or dropping water on the controller.
2. Check if the contact of input/output terminal blocks is favorable once every several months.
3. Check the working environment of the equipment and use the controller in a clean place with
good ventilation.
4. When multiple power supplies are simultaneously used, the front space of the power frame shall
be expanded as much as possible. Equipment like air conditioner or fan shall be better installed in
places where the condition allows.
5. Daily operation shall be properly recorded.
6. Check the historical records of controller on a regular basis.
3.2 Steps of Fault Maintenance
1. Check historical records of faults in LCD.
2. Check if relevant parameters are wrongfully or unreasonably set.
3. Check if the photovoltaic input voltage is within the stipulated range.
4. Check if any error exists between actual battery voltage and displayed voltage.
5. Check the charging circuit to see if it is normal.
6. Reset the system to see if it can recover to normality.
3.3 Steps of Maintenance Operation
1. Disconnect photovoltaic input circuit breaker first and then disconnect battery input circuit
breaker.
2. Use tools like screwdriver to disassemble connecting wires like ground wires connected to
photovoltaic input, backup battery and rack. Mark anode and cathode and use insulated rubber tape
(or heat-shrinkable tubing, fiber casing pipe) to properly wrap the connecting wire to pre vent the
occurrence of short circuit with other leads.
3. Disassemble the set screws on the crate of controller and then repair or replace the machine.
4. After the machine is repaired, or a new controller is replaced, the screws shall be used to lock
the crate of controller again and connect wires like ground wires connected to photovoltaic input,
backup battery and rack. Then, power-on operation can be conducted again according to wiring
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