SMA SB 2500 Installation - Manual (Page 43)

SMA Solar Technology AG Commissioning
Installation Manual SB25-30-IA-en-51 43
Minimum Frequency
In the last step, the inverter tests the minimum frequency.
During the test sequence, the frequency limit applied is
shown in the display of the inverter.
The frequency limit is increased successively until the
disconnection threshold is reached and the inverter
disconnects from the mains.
Once the inverter has disconnected from the mains, the display successively shows the following
values one after the other:
• Disconnection value,
• Calibration value,
• Reaction time,
• Current power frequency.
Once the inverter has carried out the four tests, it switches to "MPP operation (MPP)" mode. The
original calibration values are then re-set and the inverter automatically connects to the mains. If you
would like to carry out the test again, you must disconnect the inverter, i.e. disconnect it on the AC
and DC sides and then later recommission it. You can then restart the self-test as described in
Section 6.3.1 "Starting the Self-test by Tapping" (page 39). The inverter starts again the test sequence
as described in Section 6.3.2 "Completion of the Self-test" (page 39).