Monitoring The Power Frequency; Grid Monitoring Time Reached - SMA SUNNY CENTRAL 500CP XT User Manual

10 Function Description
Position Parameter
6 ‒
7 ‒
8 ‒
9 ‒

10.1.3.2 Monitoring the Power Frequency

In the operating state "Grid monitoring", Waiting for valid AC grid appears on the touch display. The grid limits are
monitored continuously from now on. If no grid error occurs during the grid monitoring time, the AC contactor closes
and the inverter switches to the operating state "Grid monitoring time reached". If the grid limits are exceeded during
the monitoring time, the inverter will restart "Grid monitoring".
You can specify the thresholds and delay times manually. For frequency monitoring, three thresholds can be
configured for both overfrequency and underfrequency. For example, at an overfrequency of 50.5 Hz, tripping can
take place after one second, and at an overfrequency of 51.5 Hz already after 0.1 seconds.
51.5
50.5
50.0
48.0
47.0
Figure 15: Tripping characteristics and time behavior as exemplified by frequency monitoring with the set parameters

10.1.4 Grid Monitoring Time Reached

The inverter is in the operating state "Grid monitoring time reached". Waiting for PV voltage or Waiting for utilities
company appears on the touch display. If the input voltage V
inverter waits until the time specified in parameter PvStrT has elapsed. If the input voltage V
start voltage PvVtgStrLevMin during this time, the inverter checks whether the utility grid is connected. If a valid AC
grid is connected, the inverter switches to the operating state "Startup". The start voltage PvVtgStrLevMin must be
adjusted to conform with the PV array connected to the inverter.
82 SCCPXT-E7-BA-en-58
Description
Grid limit level 2 is breached for delay time level 2 → grid disconnec-
tion
Grid limit level 1 is breached for delay time level 1 → grid disconnec-
tion (has already occurred on level 2)
Connection conditions fulfilled → grid monitoring time starts counting
Utility grid within valid range during grid monitoring time → grid con-
nection
HzCtIMaxTm
HzCtlhhLimTm
HzCtlhLimTm
HzCtlllLimTm
HzCtlMinTm
HzCtllLimTm
Delay time [ms]
exceeds the start voltage PvVtgStrLevMin, the
PV
SMA Solar Technology AG
does not fall below the
PV
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