Hitachi X200 Series instruction manual Overload Restriction, Frequency Pull-in Restart

		3−35
Overload Restriction
If the inverter’s output current exceeds a	Motor
preset current level you specify during	current	Restriction area
acceleration or constant speed, the overload	B022
restriction feature automatically reduces the
output frequency to restrict the overload.
This feature does not generate an alarm or	0	t
trip event. You can instruct the inverter to
apply overload restriction only during
constant speed, thus allowing higher	Output
currents for acceleration. Or, you may use	frequency
the same threshold for both acceleration and
constant speed.
When the inverter detects an overload, it	0	t
must decelerate the motor to reduce the
current until it s less than the threshold. You		B022
can choose the rate of deceleration that the		Parameters
inverter uses to lower the output current.

		“B” Function		Run		Defaults
Func.	Name /		Description	Mode -FE -FU				Units
Code	SRW Display			Edit (EU)			(USA)
B021	Overload restriction		Select the operation mode during		01		01	−
	operation mode		overload conditions, three
			options, option codes:
	OL Mode	ON	00…Disabled
B221	Overload restriction		01…Enabled for acceleration and		01		01	−
	operation mode, 2nd motor		constant speed
			02…Enabled for constant speed
	2OL Mode	ON
			only
B022	Overload restriction level		Sets the level for overload		Rated			A
	setting		restriction, between 20% and		current
	OL LVL	002.40A	150% of the rated current of the		x 1.5
			inverter, setting resolution is 1%
B222	Overload restriction level				Rated			A
			of rated current
	setting, 2nd motor				current
	2OL LVL	002.40A			x 1.5
B023	Deceleration rate at overload		Sets the deceleration rate when		1.0		30.0	sec.
	restriction		inverter detects overload, range
	OL Cnst	0001.0s	is 0.1 to 30.0, resolution 0.1
B223	Deceleration rate at overload				1.0		30.0	sec.
	restriction, 2nd motor
	2OL Cnst	0001.0s
B028	Source of overload restriction		Two option codes:		00		00	−
	selection		00…set value of B022
	OL L_SLCT	PARAM	01…[O] input
B228	Source of overload restriction		Two option codes:		00		00	−
	selection, 2nd motor		00…set value of B222
	2OL L_SLCT	PARAM	01…[O] input

Configuring Drive

Frequency Pull-in Restart

See “Restart Mode Configuration” (B088) section on page 3-42.