Interface Protection
Voltage This chapter deals with the protection settings for overvoltage and undervoltage.
Mains voltage limits are defined for this purpose. These depend on the country
setup and can be adjusted as described below.
Each mains voltage limit is defined by:
-
an undervoltage with associated protection time, or
-
an overvoltage with associated protection time.
The protection time describes the duration for which the voltage may be outside
the respective voltage limit value before the inverter switches off with an error
message.
Three overvoltage and three undervoltage limit values can be used. The "Inner
Limits" (U< for undervoltage; U>for overvoltage) refer to those limit values which
are closer to the nominal voltage. The "Middle Limits" (U< for undervoltage;
U>for overvoltage) have a greater distance to the nominal voltage. The greatest
distance between the nominal voltage and the limit value is for the "Outer Limits"
(U<< for undervoltage; U>> for overvoltage).
For expedient use of the "Inner Limits" and "Outer Limits", the respective "Inner
Limit" must be linked to a greater time than the "Outer Limit". If the "Middle
Limits" are also used, their time between "Inner Limit" and "Outer Limit" must be
set, see example in the diagram.
Graphic illustrating the limits
IL "Inner limit" - inner limit value
ML "Middle Limit" - middle limit
value
OL "Outer limit" - outer limit value
(1) Trip range
OV Overvoltage
UV Undervoltage
t
x
Protection time
These voltage limit values are not active in backup power mode. Under "Device
configuration" → " Inverter" → "Backup power", the voltage limits that apply in
backup power mode can be configured.
"Inner Limits"
Parameter Description
"Undervoltage U<" Setting value for undervoltage protection U< in [V]
"Undervoltage Time U<" Setting value of time for undervoltage protection
U< in [s]
"Overvoltage U>" Setting value for surge protection U> in [V]
"Overvoltage Time U>" Setting value of time for surge protection U> in [s]
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