Measurement Channels and Messages
SMA Solar Technology AG
30
SB_SMC_Schueco-BEN093730
User Manual
Derating
Overtemperature in the inverter.
The inverter reduces its output to prevent the device from overheating.
Corrective measures
• In the case of fan devices check heat dissipation, as described in
Section 5.1 "Checking Heat Dissipation" (page 27).
• To avoid unnecessary yield losses, your installer should check the
configuration and string size.
• The installer should also check whether the inverter could be installed in a
better position with better ventilation and adequate heat dissipation.
Derating Idc,
derat. Idc,
Der. Idc
An overcurrent condition occurs on the DC side of the inverter. The inverter reduces
its output power. This status does not damage your system but does result in energy
loss.
Corrective measures
• If this message occurs repeatedly, please contact your installer to check the
system.
Derating WR,
Der. T. WR,
Derating DC,
Der. T. DC
Overtemperature in inverter („WR“) or in the power electronics. The Sunny Boy /
Sunny Mini Central reduces its power to prevent overheating of the device.
Corrective measures
• In the case of fan devices check heat dissipation, as described in
Section 5.1 "Checking Heat Dissipation" (page 27).
• To avoid unnecessary yield losses, your installer should check the
configuration and string size.
• The installer should also check whether the inverter could be installed in a
better position to enhance ventilation.
Disturbance
Disturbance. This error is generated for safety reasons and prevents the Sunny Boy /
Sunny Mini Central from connecting to the grid.
Corrective measures
• Please contact your installer or the SMA Solar Technology Serviceline.
Earthfault /
Riso
Measurement of the insulation resistance of the PV system.
Error
An error has been detected.
Corrective measures
• Please contact your installer or the SMA Solar Technology Serviceline.
Message
Description and corrective measure
