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EOI
Function
Display
OC1
Overcurrent
(Accel)
Overcurrent
OC2
(Decel)
OC3
Overcurrent
(Run)
H7 ASD Operation Manual
Description
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.
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.
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.
Possible Causes
• 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.
• Phase-to-phase short (U, V,
or W).
• Deceleration time too short.
• Motor/machine jammed.
• Mechanical brake engaged
while the ASD is running.
• Load fluctuations.
• ASD is operating at an
elevated temperature.
Corrective Action
• 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.
• 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).
• Reduce or stabilize the
load.
• Ensure that the ASD is
adequately ventilated (see
Mounting the ASD on pg.
8).
183
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Table of Contents
Troubleshooting
