Toshiba Adjustable Speed Drive H7 Series, Инструкции по эксплуатации

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H7 ASD Operation Manual 183
OC1 Overcurrent
(Accel) This fault occurs when the
ASD current exceeds 340%
of the rated FLA on ASDs
that are 100 HP or less
during acceleration. On
ASDs that are greater than
100 HP, this fault occurs
when the ASD current
exceeds 320% of the rated
FLA during acceleration. • Phase-to-phase short (U, V,
or W).
• Accel time too short.
• Voltage Boost setting is too
high.
• Motor/machine jammed.
• Mechanical brake engaged
while the ASD is running.
• The ASD is starting into a
rotating motor.
• Ensure that the output of
the ASD is connected to
the motor correctly.
• Increase the Accel time.
• Decrease the Voltage
Boost setting.
• Ensure that the system is
not jammed.
• Ensure that the brake is
not engaged.
• The contactor between
the motor and the ASD
should be configured such
that the contactor changes
state only when the ASD
is outputting 0.0 Hz and/
or the motor is at zero
RPM.
OC2 Overcurrent
(Decel) This fault occurs when the
ASD current exceeds 340%
of the rated FLA on ASDs
that are 100 HP or less
during deceleration. On
ASDs that are greater than
100 HP, it occurs when the
ASD current exceeds 320%
of the rated FLA during
deceleration. • Phase-to-phase short (U, V,
or W).
• Deceleration time too short.
• Motor/machine jammed.
• Mechanical brake engaged
while the ASD is running.
• Ensure that the output of
the ASD is connected to
the motor correctly.
• Increase the deceleration
time.
• Ensure that the system is
not jammed.
• Adding a braking resistor
across the PA and PB
terminals will reduce the
overcurrent condition (see
F304 for further
information on this
function).
OC3 Overcurrent
(Run) This fault occurs when the
ASD current exceeds 340%
of the rated FLA on ASDs
that are 100 HP or less
during a fixed-speed run or
if during a fixed-speed run
the ASD overheats. On
ASDs that are greater than
100 HP, it occurs when the
ASD current exceeds 320%
of the rated FLA on a fixed-
speed run. • Load fluctuations.
• ASD is operating at an
elevated temperature.
• Reduce or stabilize the
load.
• Ensure that the ASD is
adequately ventilated (see
Mounting the ASD on pg.
8
).
EOI
Display
Function Description Possible Causes Corrective Action
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