Hitachi J300 Series Instruction Manual page 80

Symptom
The rpm
of the
motor
will not
increase.
The rpm
of the
motor
does not
match the
inverter.
The data The data is
is returned to
incorrect. the initial
setting.
The data has
not changed.
Data copied
by the copy
unit
is not input.
The data
Frequency
is not setting can
changed.
not be
changed.
Run and
stop can not
be done.
The data can
not be
changed.
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Probable cause
After checking the wiring of
the frequency setter, the rpm still
does not increase when the setter
is turned.
Are terminals 7 and CM1, terminal 6
and CM1 ON (Sink type)?
Is the load too great?
Is the maximum frequency setting
correct?
Are the number of motor poles,
the gear ratio, and pulley ratio correct?
The STN terminal is turned ON and the
power is turned on.
The input terminals 1 to 5 are turned
ON and then power is turned on.
Was the power turned off without
pushing the key after the data
FUNC
was changed with
1
The data is memorized upon power off.
Is the time from power OFF to ON less
than six seconds?
Is the power turned off for five seconds
or more after the display changed
from REMT to INV.
(HRW-OJ)
The change of the terminal mode and
digital operator mode were correct?
Is the input terminal SFT ON ?
Is the software lock mode set at MD2
or MD3 ?
Note: If software lock is ON because of
use with an explosion proof motor,
do not release the software locks.
Replace the frequency setter.
Turn off terminal 7 and 6. (When the
frequency and multistage speed are fixed at
a given frequency, the speed potentiometer
will be invalid.)
Decrease the load.
When the load is too great, the limiting
function will be activated, so that
the rotational speed will be lower than
the setting.
Check the speed-change ratio.
Turn the STN terminal OFF.
Input the data again.
Replace the logic PCB.
Input the data and push the
keys.
2
Take six seconds or more when turning power
OFF and ON after changing the data.
Copy again and turn the power off five
seconds or more after copying.
Confirm the change in
Turn the SFT terminal OFF.
Turn the switch OFF.
9-7
Countermeasure
key once.
FUNC
setting mode.