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Dynamic Braking
Motor Control
Accessories
5–8
Choosing a
Braking Unit
The L300P Series 200V and 400V class inverter models in the 25 to 175 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 L300P
inverter models and their applicable braking units.
25 to 175 hp (18.5 to 132 kW)
Peformance Versus External Braking Unit
Without
Braking
Unit
With Braking Unit
Voltage
Class
Model Number
L300P
Motor
hp
Braking
Torque,
%
Braking Unit
Model
Minimum
Resistance,
Ohms
Max.
Braking
Duty Cycle,
%
Minimum
Resistance
@ 100%
Braking
Duty Cycle,
Ohms
200V
–185LFU2
25
10 BRD–E2 17 10 46
10 BRD–E2–30K 4 20 6
–220LFU2
30
10 BRD–E2 17 10 46
10 BRD–E2–30K 4 20 6
–300LFU2 40 10 BRD–E2–30K 4 20 6
10 BRD–E2–55K 2 20 4
–370LFU2 50 10 BRD–E2–55K 2 20 4
–450LFU2 60 10 BRD–E2–55K 2 20 4
–550LFU2 75 10 BRD–E2–55K 2 20 4
–750LFU2 100 10 BRD–E2–55K 2 20 4
400V
–185HFU2, HFE2 25 10 BRD–EZ2 20 10 34
10 BRD–E2–30K 10 10 24
–220HFU2, HFE2 30 10 BRD–EZ2 20 10 34
10 BRD–E2–30K 10 10 24
–300HFU2, HFE2 40 10 BRD–EZ2–55K 6 20 12
–370HFU2, HFE2 50 10 BRD–EZ2–55K 6 20 12
–450HFU2, HFE2 60 10 BRD–EZ2–55K 6 20 12
–550HFU2, HFE2 75 10 BRD–EZ2–55K 6 20 12
–750HFU2, HFE2 100 10 BRD–EZ2–55K 6 20 12
–900HFU2, HFE2 125 10 BRD–EZ2–55K 6 20 12
–1100HFU2,
HFE2
150 10 BRD–EZ2–55K 6 20 12
–1320HFU2,
HFE2
175 10 BRD–EZ2–55K 6 20 12