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USER MANUAL of HPC-250HT
3.3.1.2 Waiting after Grid Failure
Each time the utility grid voltage is disconnected from the HPC-250HT or the power supply is
disconnected from the MCU of the HPC-250HT, the system waits for additional five minutes
counting from the reconnection of the MCU power supply or counting from the moment in
which the stable condition of the utility network has been met, respectively, before the HPC-
250HT is allowed to connect to the utility grid again. Note, that the utility grid stability waiting
time can be in coincidence with the Automatic Start Up waiting time, but can not be
shortened or interrupted.
The conditions, in which the utility network can be considered stable can be defined on the
"Setting 2" tab page of the User Interface and are identified as "Nominal Grid Voltage",
"Nominal Grid Frequency", "Minimum Grid Voltage", "Maximum Grid Voltage", "Grid
Frequency Limit F
max
Being in this state, the remaining time until the utility network can be declared as stable is
continuously displayed in the User Interface "Status Bar", in brackets next to the "Waiting
after Grid Failure" notification.
The system can get into this state
-
From "Automatic Startup" state, by holding the Start/Stop Key Operated Spring
Return Switch in "Start" or "Stop" position for more than three seconds.
-
From "Offline Mode", if the previously defined stability conditions for the utility network
are not met.
-
From "Connecting to Solar Arrays" state, if the previously defined stability conditions
for the utility network are not met
-
Form "Waiting after Low Power Stop" state, if the previously defined stability
conditions for the utility network are not met
-
Form "Testing of String Voltage" state, if the previously defined stability conditions for
the utility network are not met
The system can leave this state
-
If the given time interval has passed after all the grid stability criterions have been
met - thus the grid is stable for the given time interval of 5 minutes - the system
proceeds to the "Connecting to Solar Arrays" state.
-
If the disturbance in the measured grid parameters occurred in "Testing of String
Voltage" state, the system can get back to the "Testing of String Voltage" state if the
string voltage test time has not passed
-
If the disturbance in the measured grid parameters occurred in "Testing of String
Voltage" state, the system can get to the "Grid Voltage and Frequency Test" state, if
the string voltage test time has already passed
PE07019-022-B
-F
" and "Grid Frequency Limit F
nom
-F
".
nom
min
Page 13 of 69
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