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Miscellaneous Settings ~continuation~
B140: Over-current Trip Suppression – The
Over-current Trip Suppression function
monitors the motor current and actively
changes the output frequency profile to
maintain the motor current within the limits.
Although “LAD” refers to “linear
acceleration / deceleration”, the inverter only
“STOPs” the acceleration and deceleration
slope so that it will not cause the over-
current trip event.
The graph at right shows an inverter output
profile that starts acceleration to a constant
speed. At two different points during the
acceleration, motor current increases and
exceeding the fixed level of Over-current Trip
Suppression level.
When the Over-current Trip Suppression feature is enabled by B140 = 01, the inverter
stops the acceleration ramp in each case until the motor current level is again less than
the threshold value, which is approximately 150% of the rated current of the inverter.
When using the Over-current Trip Suppression feature, please note the following:
• When the Over-current Trip Suppression feature is enabled (B140 = 01), the
actual acceleration may be longer than the value set by parameters F002/F202 in
some cases.
• The Over-current Trip Suppression feature does not operate by maintaining a
constant motor current. So it is still possible to have an over-current trip event
during extreme acceleration.
B150: Carrier Mode – When the Carrier Mode is enabled (B150 = 01), the inverter
detects the motor current and automatically reduces the carrier frequency when it rises
up to a certain level.
B151: Selection of Ready function – When the Ready function is enabled (B151 = 01),
then the inverter gives out the output even the motor is stopped. This is to make all the
internal components related to motor drive energized so that the idle time between the
RUN command and actual PWM output shorter.
HIGH VOLTAGE: When set RDY function ON, there will be a voltage appear at motor
output terminals U, V and W even if the motor is in stop mode. So never touch the
inverter power terminal even the motor is not running.
Motor
current
0
t
Output
frequency
0
t
Stops accel
Resumes accel
B140 = 01
OV LADSTOP = Enable
Set acc time (F002)
Actual acc time
A
pprox. 150% of the inverte
r
rated current
3
−
47
Configuring Drive
Parameters