JFY tech SCM48100 - Page 21

Solar Controller-SCM48100 User Manual
19
Table 3-1 Comparison Table of Fault Diagnosis
No.
Phenomenon
Cause
Handling method
1
There is no display
on LCD after PV
input switch is
turned on.
a. The power supply circuit of PV is not
connected;
b. The voltage direction of PV power
supply is reversely connected;
c. The plug becomes loose due to shock
in transport;
d. LCD is damaged due to squeezing
and impact.
a. Connect PV power supply circuit;
b. Adjust PV supply voltage to
normal value;
c. Correctly connect PV power
supply;
d. Disassemble crate and plug again;
e. Repair it in local agency.
2
Under-voltage alarm
and protection are
immediately
triggered after
power-on.
a. The voltage of backup battery is too
low;
b. The DC circuit wiring is loose.
a. Adjust the voltage of backup
battery;
b. Check if the wiring is firm.
3
Overvoltage alarm
is immediately
triggered after
power-on.
a. The voltage of backup battery is not
matched with battery voltage of this
equipment.
Adjust the voltage of backup battery
to normal value.