Sungrow SG33CX User Manual page 84

9 Troubleshooting and Maintenance
Fault
Description
code
070 Fan alarm
AC-side
071
alarm
DC-side
072
alarm
076 Device anomaly
078-081 PVx abnormal
Electric
087 detection module
abnormal
74
Check method
1. Check whether the fans operate normally
and are blocked by sundries. If they are
blocked, clear the sundries.
2. If a fan does not operate normally, stop and
disconnect the inverter to replace the fan.
SPD
Check the SPD, and replace it if necessary.
SPD
Wait for the inverter to return to normal.
Disconnect the AC and DC switches, and
reconnect the AC and DC switches 15
minutes later to restart the inverter.
If the fault still exists, contact Sungrow
Service.
1. Check if the xth PV string needs to be
connected.
If not, ignore the alarm; and
If so, check the connection status and make
sure it is connected reliably.
2. Check if the xth DC fuse is damaged. If so,
replace the fuse.
3.If the fault is not caused by the foregoing
reasons and still exists, contact Sungrow
Service.
*The code
corresponding to PV 1 to PV 4 respectively.
The inverter can operate normally.
1. Check
connection and terminals are abnormal, and
check whether the ambient environment is
arc
abnormal. If so, remove the corresponding
abnormity.
2. If the fault is not caused by the foregoing
reasons and still exists, contact Sungrow
Service.
078 to code
whether the related
User Manual
081 are
cable