Wiring the Sunny Boy
SMA America, LLC
58
SB20_25_30HFUS-eng-IUS113711
Installation Guide
6.6.4 Parameter "Prescribed grounding type" or
"Md.GndModReq"
Via the parameter "Prescribed grounding type" or "Md.GndModReq" you will be able to specify the
required grounding type. Default configuration for the parameter is "Negative".
There are two ways to specify this parameter:
•
Automatically
: When in learning mode, the inverter automatically saves the grounding type
of the plugged in SMA Plug-in Grounding after 10 hours of operation.
•
Manually
: You can change the grounding type you want to use via the communication tool
(
Bluetooth
/RS485), after you have started up the inverter. It is also possible to manually
configure the parameter without the SMA Plug-in Grounding.
There are four configuration options:
Parameter "Module grounding prescribed?" / "MdGndMdt"
Configuration: No
Cause Correction
• Event number 42
• Display message
< Wrong earthing type; check earthing set >
• Red LED glows continuously.
• Green LED glows continuously.
• The inverter feeds into the grid.
The SMA Plug-in Grounding has been
connected incorrectly (reverse polarity) or is
missing.
• Correct the error as described in
section 11.3 ”Correct the Grounding
Type” (page 90).
Value
(DATA II+ / DATA I)
Explanation
Default Value
(DATA II+ / DATA I)
Positive / GndModPs The inverter only allows positive grounding.
Negative /
GndModNg
Negative / GndModNg The inverter only allows negative grounding.
None prescribed /
GndModNoneReq
No specific grounding mode is required.
Learning / GndModLrn The inverter detects the grounding and, after
10 hours of operation with the plugged in SMA
Plug‑in Grounding, saves the grounding type.
The inverter can be operated with or without
grounding.
