SMA SI 4548-US - Manual (Page 126)

14 Connecting External Sources SMA America, LLC
126 SI4548-6048-US-BE-en-20 Operating Manual
The Sunny Island charges the generator at each line conductor with the current defined in the
parameter "234.03 GnCurNom" as a maximum. The power that is not directly used by the loads
flows into the battery for charging. At the same time, the limits for the AC charging current limit
(parameter "210.02 InvChrgCurMax") on the Sunny Island and the DC charging current limit
(parameter "222.01 BatChrgCurMax") are active.
Low values for this limit may be the reason why the defined generator current cannot be adjusted. If
the battery voltage reaches the charging voltage target value, it is also reduced (absorption phase)
(see Section 13.5 "Charge Control", page 110).
If the parameter "234.15 GnCtlMod" is set to CurFrq, the generator is also limited at frequencies
lower than the nominal frequency (parameter "234.04 GnFrqNom"). This function can be used if the
full generator power is not always available and you want to prevent the generator from being
overloaded. The default setting is only intended to control the nominal generator current.
If the current set using the parameter "234.03 GnCurNom" is not sufficient for powering the loads,
the battery provides support ("real generator support").
The Sunny Island provides all the required reactive power.
14.1.7 Run Times
If the generator is started (or the Sunny Island detects an external generator start), the warm-up phase
starts. If, during this time, the voltage or frequency detected is not within the permissible range, the
warm-up time begins again.
If the generator cannot be connected at the GenMan within twice the time set at "234.12
GnWarmTm" + 2 minutes, the connection process is canceled and a new attempt is made. After three
attempts, the system changes to error state (Fail "GnNoSync").
If the generator has been connected, the minimum run time begins (parameter
"234.08 GnOpTmMin"). The generator remains connected during this time, even if in the meantime
the generator request is no longer pending.
If the minimum run time has ended and a generator request is no longer present, the generator
disconnects and enters the power-down time (Cool). If this power-down phase is completed after the
"234.10 GnCoolTm" time, the generator is stopped.
If a generator fault (e.g. generator failure) is detected, the generator is also disconnected and then
stopped immediately. In doing so, the follow-up time is skipped.
Once the stop time (parameter "234.09 GnStpTmMin") has elapsed, the generator is ready for the
next request.
If a generator fault is detected several times and the number of autostarts (parameter
"235.02 GnAutoStr") has been exceeded, the system transitions into the locked error state.
Value for parameter "234.03 GnCurNom"
A sensible value for parameter "234.03 GnCurNom" is approximately 80% of the maximum
generator current for each line conductor.
Disabling the internal generator request
An internal generator request is disabled during the after-run time and stop time or in error state.