Hitachi X200 Series 45, Ovladstop OFF, Ladst LVL, 0380V, B130, B131 Over-voltage LAD Stop Enable

Configuring Drive Parameters

3−45

B130, B131: Over-voltage LAD Stop Enable
/ Level – The over-voltage LADSTOP	B130 = 01 OV LADSTOP = Enable
function monitors the DC bus voltage and
actively changes the output frequency	DC bus
profile to maintain the DC bus voltage	voltage
within settable limits. Although “LAD”	B131
refers to “linear acceleration / deceleration”,
the inverter only “STOPs” the deceleration
slope so that regenerative voltage will not	0	t
cause the DC bus to rise enough to cause an
over-voltage trip event. Note that	Output	Stops decel
acceleration is not affected.	frequency
The graph at right shows an inverter
output profile that starts deceleration to a
stop. At two different points during the		Resumes decel
deceleration, regenerative voltage elevates
	0	t
the DC bus level, exceeding the LADSTOP		Set dec time (F003)
threshold set by B131.		Actual dec time

When the Over-voltage LADSTOP feature is enabled by B130 = 01, the inverter stops the deceleration ramp in each case until the DC bus level is again less than the threshold value.

When using the Over-voltage LADSTOP feature, please note the following:

•When the over-voltage LADSTOP feature is enabled (B130 = 01), the actual deceleration is sometimes longer than the value set by parameters F003/F203.

•The over-voltage LADSTOP feature does not operate by maintaining a constant DC bus voltage. So it is still possible to have an over-voltage trip event during extreme deceleration.

•If B131 is set lower than the normal DC bus voltage (when not in decel) by mistake, or if the inverter’s input voltage increases enough, then the inverter will apply LADSTOP (if enabled) all the time. In this case, the inverter can accelerate and run the motor, but it cannot decelerate. If you are not sure that B131 > DC bus voltage, measure the DC bus voltage in your installation and verify that the B131 value is higher.

		“B” Function		Run		Defaults
Func.	Name /		Description	Mode	-FE		-FU	Units
Code	SRW Display			Edit	(EU)		(USA)
B130	Over-voltage LADSTOP		Pauses deceleration ramp when DC bus		00		00	−
	enable		voltage rises above threshold level, in
			order to avoid over-voltage trip.
			00…Disable
	OVLADSTOP	OFF	01…Enable
B131	Over-voltage LADSTOP		Sets the threshold level for over-voltage	9	380/		380/	V
	level		LADSTOP. When the DC bus voltage is		760		760
			above the threshold value, the inverter
			stops deceleration until the DC bus
			voltage is less than the threshold
			setting again. Two voltage ranges with
			1V resolution:
			330 to 395V (200V class)
	LADST LVL 0	0380V	660 to 790V (400V class)