P.45
PM10U
EBARA
CORPORATION
5.4 Operation when momentarily power failure happens
The momentarily power failure means that power supply voltage falls temporarily. The voltage of the
interior DC circuit of the inverter, V
PN
, falls to 190V or less due to the momentarily power failure, the
inverter detects that the DC circuit Under-Voltage (UV). Pump operation continues when the V
PN
returns to 190V or more within one second. Pump operation stops and the ALARM displayed when
the momentarily power failure continues more than one second. Then ALM lamp turns on and data
screen displays “
” or “ ”. In the momentarily power failure condition, pump rotor is driven by
inertia due to interception of power supply. Thus, pumping performance may be decreased than
guaranteed specification.
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