Hitachi J300 Series Instruction Manual page 72

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The J300 series inverters are equipped with prctection functions against overcurrent,
overvoltage, and undervoltage which protect the inveder. If the protection functions are
engaged, the output is shut down, motor runs free and holds that condition until it is reset.
Description
Contents
Display
A cunrent due lo the altemating cunent CT b€tween the power module
and output terminal {U(Tl), V(I2), W(T3)} is delected.
Constant
speed
EEN
d r d a c L U r r c u r
flows through the inverlcr and causes a fault- Therefore, when an
abnormal current is detected bv the allemalins curent CT and it cxceeds
Dec,
IEiDA
a specified ralue, the output is cur oft (An abnormai current is also
detected in the power module. Refer to E:[], GEl, ffi,
and EIE1.)
Overload
\OTE I)
When a motor overload is det€cted by the elecaonic thermal function, the output
of the inverter is cul off.
IEE9|
Braking When the braking time exceeds the satting by ESIA braking duty faclor. an
overvoltage lhe output of the invener is cut oft
ffifiql
OveNollage
When the conve(er voltage exceeds a c€rtain level due to regeneralive energy from
the motor, this proteclion function engages, and the output of invener is cut ofl
tElD-l
EEPROM enor
)roTE 2)
When the memory built in has problems due to noise or ex€essive temp€rature rise,
rhis protective function engages, and the outputofinve(er is cut ofi
EWA
L ndcrvoltage
A decrease of the input voltage of an inverter results in improper function of the
contol circuit. 11 also Senerates motor h€al and causes low torque. Oulput is
cut off when the input vohage gocs down lo lcss than 300 V to 320 V.
FAgl
CT earor Abnormalifv on builtin CT and the outou!ofthe inverter is cul off.
lEIjdl
CPU error
Malfunction or abnormalily on built-in CPU and the output of the invener is cut
off.
lETr tl
trxtemal trip
An abnormality signal from extemal equipment cuts off the output of the inverter.
(When extemal tiD function is sel€cted)
USP enor
It indicates an error when power is turned on while the invener is being run.
(whcn USP tunction is s€lecled)
Ground laull
The inverter is protected by detection of gound faults between the invener output
and the motor upon power on. There may be the possibility of power module failure.
IET'qI
lnput overvollage
When the input voltage is higher than the specified value, it is detected 100 seconds
after power is tumed on and the output is cut oft However, when a volOge higher
mao approx,
500 to 530 V (40O V class) is inputted, it is hiSher thsn the rated wlue of the part
in use, so thal the part may not be protected and damaged,
ET79
power failure
(NOTE 4)
Wlen an instantaneous flower failure for more than 15 ms occurs, the oulput is cut
oft: Whcn the instantaneous power failure time is long, the fault signal is released.
Note that when restart is s€l€cted, the equipment restans when the running
tEl7dl
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