SMA Solar Technology AG Troubleshooting
Installation Guide SMC9-11TLRP-IEN100640 71
REL_INV_OPEN
REL_GRID_OPEN
A grid relay does not open. The inverter checks the relays connecting it
to the grid before feeding power into the grid. If the grid relays do not
function properly, the inverter does not connect to the grid for safety
reasons.
Corrective measures
• If this fault message is displayed repeatedly, it means that inverter
operation is permanently disabled. If the inverter is equipped with
a communication interface, try to rectify the fault using a
communication product.
• Should this be unsuccessful, contact the SMA Serviceline.
Riso The electrical insulation between the PV system and ground is faulty. The
resistance between the DC plus and/or DC minus connection and ground
is outside the defined limit range.
Corrective measures
• Check the plant insulation.
• Check the plant for ground faults as described in section 9.3”The
Red LED Glows Continuously (Ground Fault)” (page74).
Riso-Sense The insulation measurement has failed.
Corrective measures
• If this fault occurs often, contact the SMA Serviceline.
ROM The inverter's firmware is faulty.
Corrective measures
• If this fault occurs often, contact the SMA Serviceline.
SD-DI-Wandler The inverter has detected an insulation fault on the DC side.
Corrective measures
• Check the plant insulation.
• Check the plant for ground faults as described in section 9.3”The
Red LED Glows Continuously (Ground Fault)” (page74).
SD-Imax The inverter has detected an overcurrent on the AC side. It disconnects
from the grid for safety reasons and then attempts to reconnect to the
grid.
Corrective measures
• If this fault occurs often, contact the SMA Serviceline.
SD-WR-Bruecke The inverter has detected a fault in the power electronics. It disconnects
from the grid and then attempts to reconnect to the grid.
Corrective measures
• If this fault continues to occur, contact the SMA Serviceline.
Message Description and corrective measure
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