Selecting A Braking Resistor - Hitachi SJ300 Series Instruction Manual

Selecting a
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
Braking Resistor
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
• Total Watts – lists the power dissipation of the resistor or, if using multiple resistors, their
• Maximum Duty Cycle – the maximum allowable percentage of braking time over any 100-
• Maximum braking torque – the maximum braking torque that the inverter / resistor combina-
NOTE: If your application requires resistors with NEMA ratings, be sure to use the HRB type.
200V Class
JRB Series
Model
Number
Type Total
& (qty) Ohms
SJ300
–004LFU 120–3 50
–007LFU 120–3 50
–015LFU 120–4 35
–022LFU 120–4 35
–037LFU 120–4 35
–055LFU 17.5
120–4
–075LFU x (2) in 17.5
parallel
–110LFU 17.5
400V Class
JRB Series
Model
Number
Type Total
& (qty) Ohms
SJ300
–007HFU/HFE 120–2 100
–015HFU/HFE 120–2 100
–022HFU/HFE 120–2 100
–040HFU/HFE 70
120–4
–055HFU/HFE 70
x (2) in
–075HFU/HFE 70
series
–110HFU/HFE 70
combined resistance
combined power dissipation
second interval to avoid overheating the resistor(s)
tion can deliver
Dynamic Braking Resistor Selection
SRB/NSRB Series
Max.
Total Duty Type
Watts Cycle, & (qty)
%
120 1.5 300–1
120 1.5 300–1
120 1.0 400–1
120 1.0 400–1
120 1.0 400–1
240 1.0
400–1
240 1.0 x (2) in
parallel
240 1.0
Dynamic Braking Resistor Selection
SRB/NSRB Series
Max.
Total Duty Type
Watts Cycle, & (qty)
%
120 1.5 200–2
120 1.5 200–2
120 1.5 200–2
240 1.0
400–1
240 1.0
x (2) in
240 1.0
series
240 1.0
Max.
Total Total Duty Type
Ohms Watts Cycle, & (qty)
%
50 300 7.5 HRB1
50 300 7.5 HRB1
35 400 7.5 HRB2
35 400 7.5 HRB2
35 400 7.5 HRB2
17.5 800 7.5 HRB3
17.5 800 7.5 HRB3
17.5 800 7.5 HRB3
Max.
Total Total Duty Type
Ohms Watts Cycle, & (qty)
%
100 200 7.5
HRB1
100 200 7.5 x (2) in
series
100 200 7.5
70 800 10
HRB2
70 800 10
x (2) in
70 800 10
series
70 800 10
SJ300 Inverter
HRB Series Max.
Braking
Max.
Torque,
Total Total Duty
%
Ohms Watts Cycle,
%
50 400 10 200
50 400 10 200
35 600 10 200
35 600 10 160
35 600 10 100
17 1200 10 80
17 1200 10 80
17 1200 10 70
Max.
HRB Series
Braking
Max.
Torque,
Total Total Duty
%
Ohms Watts Cycle,
%
100 800 10 200
100 800 10 200
100 800 10 200
70 1200 10 140
70 1200 10 120
70 1200 10 100
70 1200 10 70
5–9