Arc Fault Current Interrupt {Afci) Function - CanadianSolar CSI-25KTL-GS-FL Installation And Operation Manual

6. Normal operation
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CanadianSolar
6.8 Arc fault current interrupt (AFCI) function
The Canadian Solar U.S. Three Phase inverter series can be supplied with an integrated AFCI
module which can detect and interrupt a serial arc in the DC circuit(s). If an arc fault occurs,
the AFCI module will detect the arc and interrupt the circuit. The fault can only be cleared manually.
During start-up, the inverter will check the AFCI module. If the check is OK, the inverter will
start normally. If the check fails, the LCD will appear as shown below in Figure 6.33.
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AFCI-CHECK fail
Restart press <ESC> 3S
Figure 6.33AFCI check fail
An arc fault indicates an irregularity in the DC portion of the PV system. This could be a faulty
PV panel, a bad DC connector or even a short circuit in the DC cabling. Check the entire DC
portion of the system to ensure there is no evidence of an arc fault.
After confirming the DC portion of the array or effecting repairs of the array, press <ESC> for
three (3) seconds, after which the inverter will restart. If the fault happens again, turn off and
restart the inverter. If the fault still happens, contact Canadian Solar Support Service .
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CanadianSolar
6. Normal operation
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ARC-FAULT
Restart press <ESC> 3S
Figure 6.34 Arc fault
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