SMA SI 3.0-11 Installation - Manual (Page 84)

8 Commissioning SMA Solar Technology AG
84 SI30M-44M-60H-80H-IA-en-30 Installation Manual
8.4.1.4 Changing the Permitted Reverse Power in the Generator
If the reverse power for the set time is exceeded, all Sunny Island inverters disconnect the generator from the
stand-alone grid and block the connection of the generator to the stand-alone grid for the minimum stop time.
Procedure:
1. Switch to expert mode on the Sunny Remote Control (see the Sunny Island inverter operating manual).
2. Select the parameter 234.13 GnRvPwr and set to the active power of the generator reverse power.
3. Select the parameter 234.14 GnRvTm and set to the time for the generator reverse power.
8.4.1.5 Configuring the Current Limit for the Generator Depending on the
Frequency
The higher the generator current, the higher the torque for the generator. With unregulated generators,
the speed of rotation decreases with increasing torque. If the speed of rotation decreases, the frequency of the generator
voltage is reduced.
If the frequency of the generator voltage falls below the rated frequency, the generator management can place
additional limits on the generator current. The lower the frequency, the more the generator current is limited by the
generator management. This setting is useful if the generator is supplying other loads parallel to the Sunny Island.
This setting allows the maximum load to be placed on the generator without overloading it.
Requirement:
☐ The generator must not be an inverter generator. The output frequency of the inverter generator is fixed.
Procedure:
1. Switch to expert mode on the Sunny Remote Control (see the Sunny Island inverter operating manual).
2. Select the parameter 234.03 GnCurNom and set to the desired value. Tip: A suitable value for the parameter
234.03 GnCurNom is 80% of the maximum generator current per line conductor.
3. Select the parameter 234.15 GnCtlMod and set to CurFrq. This will activate the frequency-dependent current
limiting.
8.4.2 Changing the Type of the Generator Interface
If you have installed a generator in the system, the type of generator interface determines how the generator
is controlled.
Procedure:
1. Switch to installer mode on the Sunny Remote Control (see the Sunny Island inverter operating manual).
2. If the generator has an autostart function, select the parameter 234.07 GnStrMod and set to Autostart.
3. If the generator does not have an autostart function, select the parameter 234.07 GnStrMod and set to Manual.
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Generator damage
In the event of reverse power, the AC sources in the stand-alone grid drive the generator. The generator can be
damaged as a result.
• Observe the manufacturer's information on reverse power protection of the generator.
• Set the generator reverse power and permitted time for reverse power according to the manufacturer's
specifications.