Selecting a braking resistor – Hitachi L300P User Manual
Page 199
L300P Inverter
Motor C
ontrol
Acc
e
ssor
ies
5–9
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.
Braking
Torque,
%
Model Number
L300P
JRB Series
SRB/NSRB Series
HRB Series
Type
& (qty)
Total
Ohms
Total
Watts
Max.
Duty
Cycle,
%
Type
& (qty)
Total
Ohms
Total
Watts
Max.
Duty
Cycle,
%
Type
& (qty)
Total
Ohms
Total
Watts
Max.
Duty
Cycle,
%
–015LFU2
120–4
35
120
1.0
400–1
35
400
7.5
200
–022LFU2
120–4
35
120
1.0
400–1
35
400
7.5
160
–037LFU2
120–4
35
120
1.0
400–1
35
400
7.5
100
–055LFU2
120–4
x (2) in
parallel
17.5
240
1.0
400–1
x (2) in
parallel
17.5
800
7.5
HRB3
17
1200
10
80
–075LFU2
17.5
240
1.0
17.5
800
7.5
HRB3
17
1200
10
80
–110LFU2
17.5
240
1.0
17.5
800
7.5
HRB3
17
1200
10
55
–150LFU2
17.5
240
1.0
17.5
800
7.5
HRB3
17
1200
10
50
400V Class
Dynamic Braking Resistor Selection
Max.
Braking
Torque,
%
Model Number
L300P
JRB Series
SRB/NSRB Series
HRB Series
Type
& (qty)
Total
Ohms
Total
Watts
Max.
Duty
Cycle,
%
Type
& (qty)
Total
Ohms
Total
Watts
Max.
Duty
Cycle,
%
Type
& (qty)
Total
Ohms
Total
Watts
Max.
Duty
Cycle,
%
–015HFU2, HFE2
120–2
100
120
1.5
200–2
100
200
7.5
200
–022HFU2, HFE2
120–2
100
120
1.5
200–2
100
200
7.5
200
–040HFU2, HFE2
120–2
100
120
1.5
200–2
100
200
7.5
HRB2
x (2) in
series
100
800
10
140
–055HFU2, HFE2
120–4
x (2) in
series
70
240
1.0
400–1
x (2) in
series
70
800
7.5
HRB2
x (2) in
series
70
1200
10
120
–075HFU2, HFE2
70
240
1.0
70
800
7.5
70
1200
10
100
–110HFU2, HFE2
70
240
1.0
70
800
7.5
70
1200
10
55
–150HFU2, HFE2
70
240
1.0
70
800
7.5
70
1200
10
50