Hitachi CP-X200 instruction manual －46, 46, DC Bus AVR for Deceleration Settings

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DC Bus AVR for Deceleration Settings

This function is to achieve stable DC bus voltage in case of deceleration. DC bus voltage rises due to regeneration during deceleration. When this function is activated (B133=01), inverter controls the deceleration time so that the DC bus voltage not to go up to the overvoltage trip level, and leads to the trip-less operation during deceleration.

Please note that the actual deceleration time may be longer in this case.

DC bus voltage

Threshold voltage to start DC bus AVR (B134)

t

Freq

t

Normal	DC bus AVR
operation

&RQ¿JXULQJ'ULYH Parameters
			“B” Function				Run		Defaults
	Func.		Name /			Description	Mode -FE -FU				Units
	Code	SRW Display					Edit	(EU)		(USA)
	B055	DC bus AVR for decel.		Proportional gain adjustment for			9	0.2		0.2	
		P-gain		DC bus AVR function. Range is:
				0.2 to 5.0
		VpnP	0000.2s
	B056	DC bus AVR for decel.		Integration time adjustment for			9	0.2		0.2	sec
		I-time		DC bus AVR function. Range is:
				0.0 to 150.0
		VpnI	0000.2s
	B133	DC bus AVR selection		00	Disabled			00		00	
		Vpn AVR	OFF	01	Enabled
	B134	Threshold voltage of DC bus		Setting of threshold voltage of				380		380	V
		AVR setting		DC bus voltage to start DC bus				/760		/760
				AVR function. Range is:
				200V class		330 to 395
		Vpn LVL	00380V	400V class		660 to 790

Difference between OV LAD STOP and DC bus AVR

This function is similar to OV LAD STOP (B130,B131) from the OV trip-less point of view. The DC bus AVR has the higher priority when both OV LAD STOP function and DC bus AVR function is set enabled.

	OV LAD STOP	DC bus AVR
Actual deceleration time	Short	Long
Fluctuation of the DC bus voltage	Big	Small

Please select the suitable function according to your system.