5 recommissioning after automatic shutdown – SMA SI 4548-US User Manual
Page 76
9 Switching On and Off
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SI4548-6048-US-BE-en-20
Operating Manual
3. Disconnect the Sunny Island from the voltage sources (AC1 and AC2). Separate AC1 and AC2
and disconnect from voltage sources.
☑ If PV inverters are connected to AC1, they automatically switch off once they are no longer
connected to the stand-alone grid.
4. Check that the Sunny Island has been disconnected from voltage sources.
5. Wait at least 15 minutes to let the capacitors discharge and to allow the voltage inside the
Sunny Island to drop to a safe level.
☑ The Sunny Island is free of voltage.
9.5 Recommissioning After Automatic Shutdown
A complete shutdown indicates that off-grid system devices have failed or are not working correctly
due to incorrect parameter settings. Check the off-grid system for possible faults, both before and after
recommissioning to avoid a complete shutdown in the future.
To recommission the Sunny Island after it has switched off due to a battery being too deeply
discharged, proceed as follows:
1. Switch the DC circuit breaker of the Sunny Island to "OFF".
2. Wait at least 15 minutes.
3. Switch the DC circuit breaker of the Sunny Island to "ON".
☑ The display light of the Sunny Island switches on.
4. Switch on the Sunny Island as described in section (see Section 9.1 "Switching On", page 74).
Damage to the Sunny Island and connected devices
• Disconnect the loads only.
• Do not disconnect generators.
• Install an external load-shedding contactor if the Sunny Island is coupled to PV arrays or wind
generators on the AC-generating side.
Danger to life due to high voltages in the Sunny Island Death or serious injury possible
due to electric shock
After an automatic disconnection, high residual voltages can remain in the Sunny Island capacitors.
• Wait at least 15 minutes before restarting the Sunny Island. The capacitors in the Sunny Island
discharge during this time.
Switching on the DC circuit breaker
If, in rare cases, the device cannot be switched back on after 15 minutes, wait 30 minutes and
try again.