Eltek Valere Theia He-t User Manual page 47

Voltage Monitoring
First, the overvoltage monitoring is checked. The voltage trip level is ramped down from the
maximum allowed voltage level, 276 V
voltage. The time it takes from equalization of the voltage to when the inverter disconnects
from the grid is measured.
If the sequence is successfully carried out, PASS appears. If FAIL appears, start the test again
later.
Second, the undervoltage monitoring is checked. The trip level is ramped up from the
minimum allowed voltage level, 184 V
voltage. The time it takes from equalization to disconnection is measured.
User Manual THEIA HE-t String Inverters
, and decreased until it equals the current grid
AC
V Maximum allowed voltage; trip
AC max
level
V Disconnection voltage level;
AC off
equalization
t Maximum allowed disconnection
max
time
t Time from equalization to
off
disconnection
PASS The first sequence is successfully
carried out
FAIL The first sequence has failed – try
again later
, and increased until it equals the current grid
AC
V Minimum allowed voltage; trip
AC min
level
V Grid voltage level
AC off
t Minimum allowed disconnection
min
time
t Time from equalization to
off
disconnection
PASS The second sequence is
successfully carried out
FAIL The second sequence has failed –
try again later
,
357115.013 Issue 1.0, 2011 April
47