Rate Of Change Of Frequency; Ramp Rate; Fail-Safe; Initial Start Time, Reconnect Time - Fronius SnapINverter Serviceanleitung

Rate of change of
This function allows the RoCoF (Rate of Change of Frequency) switch-off to be activated.
frequency
If the frequency falls to below the set limit, the inverter is not switched off.
Selection options
ROCOF On/OFF
ROCOF TripTime
ROCOF Limit

Ramp Rate

The ramp rates limit the maximum rate of change of the effective power that is triggered by
external inputs (e.g. Modbus, DRM, PSC editor). If slower ramp rates are defined by the
characteristic mode (e.g. P(U), P(F) or start-up), the lowest rate of change is used.
The value 0 corresponds to the maximum rate of change.

Fail-Safe

When starting up the system, the Datamanager and inverter control (ReCerbo PC board)
should be synchronised so that both control components are fully ready for use. This al-
lows many problems caused by different system statuses to be avoided.
The ReCerbo blocks feed-in enabling until the Datamanager has fully booted up and all
system-relevant services have started.
For devices without a Datamanager, the setting must be Off, otherwise the device will not
start. When using the dynamic feed-in limitation, the "Permanent" setting can be used to
prevent unauthorised feed-in during the start-up phase or in the event of a Datamanager
fault.
Requirements:
Datamanager version: 3.7.3-2
ReCerbo version: 0.3.11.10
Selection options
DM FailSafe Mode
DM FailSafe Behaviour Disconn.
Initial Start Time,
Initial Start Time
Reconnect Time
Grid monitoring time before the inverter is started up in s
1 - 900 s
Reconnect Time
Grid monitoring time before the inverter is started up after a grid fault in s
1 - 900 s
80
ROCOF On/Off / ROCOF Limit / ROCOF TripTime
for activating and deactivating the ROCOF functionality.
When the ROCOF functionality is deactivated, a change in fre-
quency does not cause a switch-off event.
Default setting: Off
Operating time within which the device switches off in case of a
too rapid change in frequency
50 - 16000 ms (default: 300 ms)
Limit value for change in frequency that triggers a switch-off if
ROCOF is activated.
50 - 99999 mHz/s (default: 2500 mHz/s)
DM FailSafe Mode / DM FailSafe Behaviour
Off / Permanent