Hitachi SJ300 Series SRW Display, SRW Display, “B” Function, “B” Function, Controlled Deceleration at Power Loss

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“B” Group: Fine-Tuning Functions

	“B” Function		Run		Defaults
			Mode				Units	SRW Display
Func.			Edit	–FE	–FU	–FR
	Name	Description
Code			Lo Hi	(EU)	(US)	(JP)
B046	Reverse Run protection	Prohibits reverse motor	✘ ✔	00	00	00	—	>b046 LIMIT
	enable	rotation. Two option codes:						PREV	OFF
		00 Disable
		01 Enable

Configuring Drive Parameters

Controlled Deceleration at Power Loss – When enabled, this feature permits the inverter to control final motor deceleration upon loss of inverter input power. First, you must make a wiring change to the inverter. See “Optional Controlled Decel and Alarm at Power Loss” on page 4–4 for complete instructions including wiring and signal timing diagrams for using the controlled deceleration at power loss feature.

After making the wiring change, use function B050 to enable the feature. Use B051 to determine the point at which a decaying DC bus voltage will trigger the controlled deceleration. Use parameter B054 to specify an initial step-wise deceleration at power loss, and B053 to specify the duration of the linear deceleration.

During the controlled deceleration the inverter itself acts as a load to decelerate the motor. With either a high-inertia load or a short deceleration time (or both), it is possible that the inverter impedance will not be low enough to continue linear deceleration and avoid an over-voltage condition on the DC bus. Use parameter B052 to specify a threshold for the over-voltage. In this case, the inverter pauses deceleration (runs at constant speed). When the DC bus decays again below the threshold, linear deceleration resumes. The pause/resume process will repeat as necessary until the DC bus energy is depleted (under-voltage condition occurs).

	“B” Function		Run		Defaults
			Mode				Units	SRW Display
Func.			Edit	–FE	–FU	–FR
	Name	Description
Code			Lo Hi	(EU)	(US)	(JP)
B050	Controlled deceleration	Allows inverter control	✘ ✘	00	00	00	—	>b050 IPS-DECEL
	and stop on power loss	using regenerative energy to						Mode	OFF
		decelerate after loss of input
		power (requires jumper
		change)
		Two option codes:
		00 Disable
		01 Enable
B051	DC bus voltage trigger	Sets trigger for controlled	✘ ✘	0.0	0.0	0.0	VDC	>b051 IPS-DECEL
	level during power loss	deceleration and stop on						V1	0000.0Vdc
		power loss function.
		Range is 0.0 to 1000.V
B052	Over-voltage threshold	Sets over-voltage threshold	✘ ✘	0.0	0.0	0.0	VDC	>b052 IPS-DECEL
	during power loss	for controlled deceleration						V2	0000.0Vdc
		function.
		Range is 0.0 to 1000.V
B053	Deceleration time	Range is 0.01 to 99.99 sec. /	✘ ✘	1.00	1.00	1.00	sec.	>b053 IPS-DECEL
	setting during power	100.0 to 999.9 sec. /						TIME	0001.00s
	loss	1000 to 3600 sec.
B054	Initial output frequency	Sets the initial decrease in	✘ ✘	0.00	0.00	0.00	Hz	>b054 IPS-DECEL
	decrease during power	output frequency upon						DEC-F	00.00Hz
	loss	power loss.
		Range is 0.00 to 10.00 Hz