Selecting A Braking Resistor - Hitachi L300P Series Instruction Manual

Selecting a
Braking Resistor
200V Class
Model Number
Type
L300P
& (qty)
–015LFU2 120–4
–022LFU2 120–4
–037LFU2 120–4
–055LFU2
120–4
–075LFU2
x (2) in
–110LFU2
parallel
–150LFU2
400V Class
Model Number
Type
L300P
& (qty)
–015HFU2, HFE2 120–2
–022HFU2, HFE2 120–2
–040HFU2, HFE2 120–2
–055HFU2, HFE2
120–4
–075HFU2, HFE2
x (2) in
–110HFU2, HFE2
series
–150HFU2, HFE2
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.
Dynamic Braking Resistor Selection
JRB Series
Max.
Total Total Duty Type
Ohms Watts Cycle, & (qty)
%
35 120 1.0 400–1
35 120 1.0 400–1
35 120 1.0 400–1
17.5 240 1.0
400–1
17.5 240 1.0
x (2) in
17.5 240 1.0
parallel
17.5 240 1.0
Dynamic Braking Resistor Selection
JRB Series
Max.
Total Total Duty Type
Ohms Watts Cycle, & (qty)
%
100 120 1.5 200–2
100 120 1.5 200–2
100 120 1.5 200–2
70 240 1.0
400–1
70 240 1.0
x (2) in
70 240 1.0
series
70 240 1.0
SRB/NSRB Series
Max.
Total Total Duty Type
Ohms Watts Cycle, & (qty)
%
35 400 7.5
35 400 7.5
35 400 7.5
17.5 800 7.5 HRB3
17.5 800 7.5 HRB3
17.5 800 7.5 HRB3
17.5 800 7.5 HRB3
SRB/NSRB Series
Max.
Total Total Duty Type
Ohms Watts Cycle, & (qty)
%
100 200 7.5
100 200 7.5
100 200 7.5 HRB1
x (2) in
series
70 800 7.5 HRB2
x (2) in
70 800 7.5
series
70 800 7.5
70 800 7.5
5–9
L300P Inverter
HRB Series Max.
Braking
Max.
Torque,
Total Total Duty
%
Ohms Watts Cycle,
%
200
160
100
17 1200 10 80
17 1200 10 80
17 1200 10 55
17 1200 10 50
Max.
HRB Series
Braking
Max.
Torque,
Total Total Duty
%
Ohms Watts Cycle,
%
200
200
100 800 10 140
70 1200 10 120
70 1200 10 100
70 1200 10 55
70 1200 10 50