Hitachi X200 Series instruction manual 47, Miscellaneous Settings ~continuation~

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Miscellaneous Settings ~continuation~

Configuring Drive Parameters

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.

B140 = 01 OV LADSTOP = Enable

Motor	Approx. 150% of the inverter
current
	rated current

0	t
Output	Stops accel
frequency
	Resumes accel
0	t

Set acc time (F002)

Actual acc time

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.