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Dynamic Braking
Motor Control
Accessories
5–8
Choosing a
Braking Unit
The SJ300 Series 200V and 400V class inverter models in the 20 to 200 hp range require
external braking units to increase their braking torque. Braking units come in sizes correspond-
ing to the power handing requirements for particular resistor selections. Be sure to follow the
installation instructions accompanying each braking unit. The following table lists the SJ300
inverter models and their applicable braking units.
20 to 200 hp (15 to 1500 kW)
Performance Versus External Braking Units
Without
Braking
Unit
With Braking Unit
Voltage
Class
Model Number
SJ300
Motor
hp
Braking
Torque,
%
Braking Unit
Model
Minimum
Resistance,
Ohms
Max.
Braking
Duty Cycle,
%
Minimum
Resistance
@ 100%
Braking
Duty Cycle,
Ohms
200V
–150LFU
20
10 BRD–E2 17 10 46
10 BRD–E2–30K 4 20 6
–185LFU
25
10 BRD–E2 17 10 46
10 BRD–E2–30K 4 20 6
–220LFU
30
10 BRD–E2 17 10 46
10 BRD–E2–30K 4 20 6
–300LFU 40 10 BRD–E2–30K 2 20 6
10 BRD–E2–55K 2 20 4
–370LFU 50 10 BRD–E2–55K 2 20 4
–450LFU 60 10 BRD–E2–55K 2 20 4
–550LFU 75 10 BRD–E2–55K 2 20 4
400V
–150HFU/HFE 20 10 BRD–EZ2 20 10 34
10 BRD–EZ2–30K 10 10 24
–185HFU/HFE 25 10 BRD–EZ2 20 10 34
10 BRD–EZ2–30K 10 10 24
–220HFU/HFE 30 10 BRD–EZ2 20 10 34
10 BRD–EZ2–30K 10 10 24
–300HFU/HFE 40 10 BRD–EZ2–55K 6 20 12
–370HFU/HFE 50 10 BRD–EZ2–55K 6 20 12
–450HFU/HFE 60 10 BRD–EZ2–55K 6 20 12
–550HFU/HFE 75 10 BRD–EZ2–55K 6 20 12
–750HFU/HFE 100 10 BRD–EZ2–55K 6 20 12
–900HFU/HFE 125 10 BRD–EZ2–55K 6 20 12
–1100HFU/HFE 150 10 BRD–EZ2–55K 6 20 12
–1320HFE 175 10 BRD–EZ2–55K 6 20 12
–1500HFU 200 10 BRD–EZ2–55K 6 20 12