Hitachi SJ300 Series Selecting a Braking Resistor, 200V Class, 400V Class, Dynamic Braking Resistor Selection, Dynamic Braking Resistor Selection

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SJ300 Inverter

Selecting a Braking Resistor

You can add one or more resistors to your inverter configuration to increase braking torque performance. The number of resistors and their configuration (series or parallel) depends on the desired braking torque. The tables below list the resistor types for inverter models with internal braking units. Tables for inverters with external braking units are on the next two pages.

•Total Ohms – lists the resistance value of the resistor or, if using multiple resistors, their combined resistance

•Total Watts – lists the power dissipation of the resistor or, if using multiple resistors, their combined power dissipation

•Maximum Duty Cycle – the maximum allowable percentage of braking time over any 100- second interval to avoid overheating the resistor(s)

•Maximum braking torque – the maximum braking torque that the inverter / resistor combina- tion can deliver

NOTE: If your application requires resistors with NEMA ratings, be sure to use the HRB type.

200V Class				Dynamic Braking Resistor Selection
													Max.
		JRB Series			SRB/NSRB Series					HRB Series
Model													Braking
				Max.				Max.				Max.
Number													Torque,
	Type	Total	Total	Duty	Type	Total	Total	Duty	Type	Total	Total	Duty	%
SJ300	& (qty)	Ohms	Watts	Cycle,	& (qty)	Ohms	Watts	Cycle,	& (qty)	Ohms	Watts	Cycle,
				%				%				%
–004LFU	120–3	50	120	1.5	300–1	50	300	7.5	HRB1	50	400	10	200
–007LFU	120–3	50	120	1.5	300–1	50	300	7.5	HRB1	50	400	10	200
–015LFU	120–4	35	120	1.0	400–1	35	400	7.5	HRB2	35	600	10	200
–022LFU	120–4	35	120	1.0	400–1	35	400	7.5	HRB2	35	600	10	160
–037LFU	120–4	35	120	1.0	400–1	35	400	7.5	HRB2	35	600	10	100
–055LFU	120–4	17.5	240	1.0	400–1	17.5	800	7.5	HRB3	17	1200	10	80
–075LFU	x (2) in	17.5	240	1.0	x (2) in	17.5	800	7.5	HRB3	17	1200	10	80
	parallel				parallel
–110LFU		17.5	240	1.0		17.5	800	7.5	HRB3	17	1200	10	70

400V Class				Dynamic Braking Resistor Selection
													Max.
		JRB Series			SRB/NSRB Series					HRB Series
Model													Braking
				Max.				Max.				Max.
Number													Torque,
	Type	Total	Total	Duty	Type	Total	Total	Duty	Type	Total	Total	Duty	%
SJ300	& (qty)	Ohms	Watts	Cycle,	& (qty)	Ohms	Watts	Cycle,	& (qty)	Ohms	Watts	Cycle,
				%				%				%
–007HFU/HFE	120–2	100	120	1.5	200–2	100	200	7.5	HRB1	100	800	10	200
–015HFU/HFE	120–2	100	120	1.5	200–2	100	200	7.5	x (2) in	100	800	10	200
									series
–022HFU/HFE	120–2	100	120	1.5	200–2	100	200	7.5		100	800	10	200
–040HFU/HFE		70	240	1.0		70	800	10		70	1200	10	140
	120–4				400–1				HRB2
–055HFU/HFE		70	240	1.0		70	800	10		70	1200	10	120
	x (2) in				x (2) in				x (2) in
–075HFU/HFE		70	240	1.0		70	800	10		70	1200	10	100
	series				series				series
–110HFU/HFE		70	240	1.0		70	800	10		70	1200	10	70

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