Mitsubishi FREQROL-SFJ, Руководство по обслуживанию

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(7) BRAKING CIRCUIT FAULT
This alarm occurs if the braking circuit does not func-
tion properly.'
Cause
Checkup
Remedy
Trouble with card Replace the card SFJ-CA1
Replace the card
SFJ-CA1 with a new one to check.
Trouble with con- 'If the same alarm occurs
Replace the con-
unit.
again with a new card trol unit.
the control unit is
.
likely to be defective.
(8) OVER SPEED
This alarm appears if motor speed exceeds 115% of the
rated speed.
Cause Checkup
Parameter setting The motor maximum speed
improper is under
Remedy
Speed detection
Observe the signal from CH31
signal distorted
and 32 (common CH23) of
by noise
using an oscilloscope,
check for signal.
Check if shielding of cable
'between motor and CON2 is
If the setting is
too low,
speed de-
tection range is
narrow (15%) and
therefore this
alarm is likely to
occur.
Increase setting
of maximum speed
parameter
Use a continuous
cable to assure
continuous shield-
ing.