Hitachi SJ300 Series Acceleration Pause Function

3–21

SJ300 Inverter

	“A” Function		Run		Defaults
			Mode				Units		SRW Display
Func.			Edit	–FE	–FU	–FR
	Name	Description
Code			Lo Hi	(EU)	(US)	(JP)
A063	Jump (center) frequency	Up to 3 output frequencies	✘ ✔	0.00	0.00	0.00	Hz	>A063 JUMP
A065	setting	can be defined for the output						F1	0000.00Hz
								>A065 JUMP
A067		to jump past to avoid motor
								F2	0000.00Hz
		resonances (center
								>A067 JUMP
		frequency)						F3	0000.00Hz
		Range is 0.00 to 400.0 Hz
A064	Jump (hysteresis)	Defines the distance from	✘ ✔	0.50	0.50	0.50	Hz	>A064 JUMP
A066	frequency width setting	the center frequency at						W1	00.50Hz
								>A066 JUMP
A068		which the jump occurs
								W2	00.50Hz
		Range is 0.0 to 10.0 Hz
								>A068 JUMP
								W3	00.50Hz

Acceleration Pause Function

The acceleration pause function can be		Output
used to minimize the occurrence of
	frequency
over-current trips when accelerating
					Set frequency
high inertia loads. It introduces a dwell
or pause in the acceleration ramp. You
			Accel pause
can control the frequency at which this
				period
dwell occurs (A069), and the duration
		A069
of the pause time (A070). This function
can also be used as an anti-windmilling	0
						t
tool, when the load might have a				A070

tendency to drive the motor in a reverse

direction while the inverter is in a Stop mode. Initiating a normal acceleration in such a situation may result in over-current trips. This function can be used to keep the inverter output frequency and voltage at low levels long enough to bring the load to a stop, and commence turning in the desired direction before the acceleration ramp resumes. See also “DC Braking Settings” on page 3–18.

Parameters Drive Configuring

	“A” Function		Run		Defaults
			Mode				Units		SRW Display
Func.			Edit	–FE	–FU	–FR
	Name	Description
Code			Lo Hi	(EU)	(US)	(JP)
A069	Acceleration pause	Range is 0.00 to 400.0Hz	✘ ✔	0.00	0.00	0.00	Hz	>A069 F-STOP
	frequency setting							F	0000.00H
A070	Acceleration pause time	Range is 0.0 to 60.0 sec.	✘ ✔	0.0	0.0	0.0	sec.	>A070 F-STOP
	setting							T	00.0s