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USER MANUAL of HPC-250HT
3.3.1.3 Testing of String Voltage
In thi state the HPC-250HT ascertains the sufficient level of DC voltage. This check is
performed by measuring the DC voltage level at the DC power input of the HPC-250HT until
sufficient DC voltage vs. time area was measured.
The time that has passed with the DC voltage level above the set threshold is continuously
indicated in brackets next to the "Start Time" value on the "Settings" tab page of the User
Interface and indicated on the Status bar In brackets, net to the "Testing of String Voltage"
text.
The system can get into this state
-
From "Waiting after Low Power Stop" state, if the time set in the "Wait Time" textbox
on the "Setting 1" tab page has passed.
-
From "Waiting after Grid Failure" state if the necessary waiting time after the grid
failure has passed.
-
From "Connecting to Solar Arrays" state after successful connection to the solar
arrays
The system can leave this state
-
If the measured DC voltage level is above the voltage level set in the "Start Voltage"
[volts] textbox for the time duration set in the "Start Time" [seconds] textbox on the
"Setting 1" tab-page, and – after a regular, low-power shut down - the "Wait Time"
defined on the "Setting 1" tab page has passed, the system switches to "Grid Voltage
and Frequency Test" state
-
By holding the Start / Stop Key Operated Spring-Return Switch (-S1) in "Stop"
condition for more than 3 seconds the system switches to "Shut Down" state
PE07019-022-B
Page 14 of 69
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