Aros APPENDIX 1500 Manual De Instrucciones página 70


By pressing the button again the display panel shows the upper frequency threshold
check. The display shows a message similar to "f↑ 50.3Hz ≤0.06s", which is the
value set for the upper frequency threshold and the maximum delay admitted before
the protection intervenes (in reality the display would not show this value, as the
0.06s step (3 cycles) has only been shown as the protection is not sensitive to the
frequency variations less than 40ms (two cycles)). By pressing the button once
again, the display shows the variation of the upper frequency threshold and the
frequency value of the mains supply as measured by the micro-controller. If the
value of the threshold and the mains supply frequency are equal the inverter
switches to the "fault" status (red LED on), by doing so the inverter disconnects
from the grid and the display panel shows for example a message similar to
"T OK 50Hz -0.05S". This means that the threshold and the measured mains supply
frequency have become equal at 50Hz and the switching time is 0.05" seconds.

By pressing the button again the display panel shows the lower frequency
threshold check. The display shows a message similar to "f↓ 49.7Hz ≤0.06s",
which is the value set for the lower frequency threshold and the maximum delay
admitted before the protection intervenes (in reality the display would not show
this value, as the 0.06s step (3 cycles) has only been shown as the protection is
not sensitive to the frequency variations less than 40ms (two cycles)).
By pressing the button once again, the display shows the variation of the lower
frequency threshold and the frequency value of the mains supply as measured by
the micro-controller. If the value of the threshold and the mains supply frequency
are equal the inverter switches to the "fault" status (red LED on), by doing so the
inverter disconnects from the grid and the display panel shows for example a
message similar to "T OK 50Hz -0.05S". This means that the threshold and the
measured mains supply frequency have become equal at 50Hz and the switching
time is 0.05" seconds.
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