20 Program features
Connection limits
The grid monitoring function of the inverter includes a connection condition checking that
is used only in a grid connection. Typically, the connection limits are stricter than the
disconnection limits. The connection limits are also referred as "cut-in" conditions.
There are connection limits for underfrequency, overfrequency, overvoltage and
undervoltage. Each phase/main voltage is independently monitored.
Settings
188.20 Connect underfrequency type
188.21 Connect underfrequency limit
188.22 Connect overfrequency type
188.23 Connect overfrequency limit
188.24 Connect undervoltage type
188.25 Connect undervoltage limit
188.26 Connect overvoltage type
188.27 Connect overvoltage limit
Voltage monitoring
There are two limits for undervoltage monitoring and three limits for overvoltage
monitoring. Each limit has an enable parameter, a limit parameter and a time parameter.
When the limit is enabled and the measured value exceeds the limit for the time, the grid is
declared as unstable. All limits are logically connected in parallel. Each phase/main
voltage is independently monitored.
Settings
188.50 Undervoltage enable 1 -- 188.71 Overvoltage time 3
Sliding overvoltage
Sliding overvoltage implements the monitoring of the slowly rising AC voltage. A
10 minutes average value is calculated and compared against the limit. Each phase/main
voltage is independently monitored.
Settings
188.72 Sliding overvoltage enable
188.73 Sliding overvoltage limit
188.74 Sliding overvoltage time
Frequency monitoring
There are two limits for underfrequency and overfrequency monitoring. Both the limits
have an enable parameter, a limit parameter and a time parameter.
When the limit is enabled and the measured value exceeds the limit for the time, the grid is
declared as unstable. All limits are logically connected in parallel.
Settings
188.30 Underfrequency enable 1 -- 188.45 Overfrequency time 2
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