Installation and Operation Guide SOLECTRIA PVI 25TL-480-R
DOCR-071030-A (11/17/2020)
Page 77 of 101
6.2
Fault and Troubleshooting
DANGER
Electric Shock Hazard:
Disconnect the inverter from the AC grid and PV modules before opening equipment. Make sure
hazardous high voltage and energy inside the wire-box has been discharged. Wait at least 5 minutes after disconnecting
all power sources before opening and maintaining the inverter.
The inverter will shut down automatically if the PV power generation system fails, such as from a short circuit on the
output lines, grid overvoltage / under-voltage, grid over-frequency / under-frequency, high ambient temperature or
internal malfunction of the machine. The fault information will be displayed on the Yaskawa Connect Pro APP interface.
The Fault Recording Menu can store up to 128 fault records.
The causes of a fault can be identified based on the faults listed in Table 6-1. Proper analysis is recommended before
contacting customer service. There are 4 types of faults: alarm, warn, protection and hardware faults.
WARNING
Operating the DC Switch:
The DC Switch is rated to break loads under normal operating conditions. However, a DC short
circuit could be hazardous and the following procedures should be followed before turning OFF the DC Switch under
fault conditions.
If there is a fault and it is safe to access the inverter:
Read/record the fault code(s) displayed on the APP interface.
Turn OFF the inverter via the APP or Remote access.
Turn OFF the AC feed breaker.
Turn OFF the AC Switch.
If possible, read the DC MPPT currents displayed on the APP interface:
o
If the MPPT current is <24A or the irradiance is obviously low, turn OFF the DC switch.
o
If it is safe to open the wire-box, proceed with troubleshooting procedures listed in Table 6-1. Make sure
appropriate safety precautions and PPE are used.
If it is not possible to read the DC MPPT currents through the APP interface, and no fire, smoke or voltage (AC or
DC) to ground is present in the enclosure:
o
Follow general safety practices including PPE to open the wire-box.
o
Measure the DC current on each string. If zero, open the fuse holder for each string reading
approximately zero amps.
o
If the DC current is >0.25A, do not open the fuse holder.
o
When all possible fuses are open, measure the total MPPT current. If it is <24A, turn OFF the DC switch.
o
If turning OFF the DC switch causes smoke, then (if safe) turn the DC switch back ON and wait until low
irradiation ~30min prior to sunset to continue troubleshooting.
If there is a fault and it is unsafe to access the inverter:
Notify someone else. Initiate emergency mitigation plan if necessary.
o
If smoke or fire exists, procure a fire extinguisher that is rated for electrical fires.