Hitachi SJ100 - Manual (Page 166)

Dynamic Braking
Motor Control
Accesso
ri
es
5–8
Selecting Braking Resistors for Internal Braking Units
You can add one or more resistors to your inverter configuration to increase braking
torque performance. The tables below lists 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
combination can deliver
The table below lists 200V-class inverter models
with built-in braking units. Depending on the
desired braking torque or on the inverter model,
the resistor selection specifies multiple resistors
in a parallel or series combination. The example
diagram shows a parallel configuration. Please
refer to the braking resistor documentation for
detailed wiring diagrams.
Inverter
JRB x (2) parallel
+
RB
200V Class
Dynamic Braking Resistor Selection
JRB Series SRB/NSRB Series HRB Series
SJ100
Model
Number
HP
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
(%)
002NFE/NFU 1/4 120–1 180 120 5.0 200–1 180 200 10.0
004NFE/NFU 1/2 120–1 180 120 5.0 200–1 180 200 10.0
005NFE 3/4 120–1 180 120 5.0 200–1 180 200 10.0
007NFE/NFU 1 120–2 100 120 2.5 200–2 100 200 7.5
011NFE 1.5 120–2 100 120 2.5 200–2 100 200 7.5
015NFE/NFU 2 120–3 50 120 1.5 300–1 50 300 7.5
022NFE/NFU 3 120–3 50 120 1.5 300–1 50 300 7.5
037LFU 5 120–4 35 120 1.0 400–1 35 400 7.5
055LFU 7.5 120–4
x (2) in
parallel
17.5 240 1.0 400–1
x (2) in
parallel
17.5 800 7.5 HRB3 17 1200 10.0
075LFU 10 17.5 240 1.0 17.5 800 7.5 HRB3 17 1200 10.0