Hitachi AN091802-1 instruction manual DC voltage to be supplied, 3Cautions

[2] DC voltage to be supplied

Supplied DC voltage should be between the UV voltage and the OV voltage (or BRD ON level) of the inverter.

Model name		UV level	BRD ON level	OV level (regen.)	OV level (source)
J100	200V class	140Vac ~ 160Vac	(V-SET) +137.5V	390Vdc ± 15Vdc
	400V class	280Vac ~ 320Vac	(V-SET) +275V	780Vdc ± 30Vdc
J300	200V class	140Vac ~ 160Vac	(AVR set) +138V	369Vdc ~ 404Vdc
	400V class	280Vac ~ 320Vac	(AVR set) +276V	756Vdc ~ 827Vdc
L100	200V class	190Vdc ± 10Vdc	-	395Vdc ± 20Vdc	Aprx. 365Vdc for 100s
	400V class	395Vdc ± 20Vdc		790Vdc ± 40Vdc	Aprx. 730Vdc for 100s
SJ100	200V class	Same as L100	370Vdc +4%,-3%	Same as L100	Same as L100
	400V class		740Vdc +4%,-3%
L300P	200V class	200Vdc ± 10Vdc	-	395Vdc ± 10Vdc	Aprx. 380Vdc for 60s
	400V class	400Vdc ± 20Vdc		790Vdc ± 20Vdc	Aprx. 760Vdc for 60s
SJ300	200V class	Same as L300P	Adjustable by	Same as L300P	Same as L300P
	400V class		[b096]

ØIf it is higher, inverter may trip with OV or BRD error.

ØIf it is lower, inverter may trip with UV.

[3]Cautions

Case 1 : Connected parallel to a common DC net

Big inrush current at power ON

INV #1

ØTake preventive measures to limit inrush current at power ON, since the integrated inrush current limiting circuit is not used. à Otherwise there will be a unexpected UV at net side or

DC power supply

M 1

damage to the inverter caused by ΔV=di/dt.

INV #2

ØUse DC chokes for each inverter to avoid interaction due to surge and/or harmonics.

à Otherwise there may be an unexpected failure of the

M 2

inverter or other attached equipment.

INV #n

ØTake preventive measures to ensure sufficient time between UV level and dead voltage of the DC/DC converter (*1) at power OFF. This is to allow ample time for EEPROM to store

the existing data at power OFF. (Δt ; see below)

àOtherwise there is a possibility of an EEPROM error at the next power ON.

M n

Main power (AC) For Cases 2 & 3

DC bus voltage For Cases 1~3

DC-DC conv. (internal 5V)

EEPROM store period

OFF

UV level

Threshold voltage of DC-DC converter (This value depends on the inverter model.

But in general it is around 100Vdc)

	Δt	(*1) The required time depends on the parameters
Around 0.5~1s or more which have changed before power OFF.