Choosing A Braking Unit - Hitachi SJ300 Series Instruction Manual

5–8
Dynamic Braking
Choosing a
Braking Unit
20 to 200 hp (15 to 1500 kW)
Voltage
Class
200V
400V
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.
Model Number
Motor
hp
SJ300
–150LFU
20
–185LFU
25
–220LFU
30
–300LFU 40
–370LFU 50
–450LFU 60
–550LFU 75
–150HFU/HFE 20
–185HFU/HFE 25
–220HFU/HFE 30
–300HFU/HFE 40
–370HFU/HFE 50
–450HFU/HFE 60
–550HFU/HFE 75
–750HFU/HFE 100
–900HFU/HFE 125
–1100HFU/HFE 150
–1320HFE 175
–1500HFU 200
Performance Versus External Braking Units
Without
Braking
Unit
Braking
Braking Unit
Torque,
Model
%
10 BRD–E2–N
10 BRD–E2–30K
10 BRD–E2–N
10 BRD–E2–30K
10 BRD–E2–N
10 BRD–E2–30K
10 BRD–E2–30K
10 BRD–E2–55K
10 BRD–E2–55K
10 BRD–E2–55K
10 BRD–E2–55K
10 BRD–EZ2–N
10 BRD–EZ2–30K
10 BRD–EZ2–N
10 BRD–EZ2–30K
10 BRD–EZ2–N
10 BRD–EZ2–30K
10 BRD–EZ2–55K
10 BRD–EZ2–55K
10 BRD–EZ2–55K
10 BRD–EZ2–55K
10 BRD–EZ2–55K
10 BRD–EZ2–55K
10 BRD–EZ2–55K
10 BRD–EZ2–55K
10 BRD–EZ2–55K
With Braking Unit
Minimum
Max. Resistance
Minimum
Braking
Resistance,
Duty Cycle,
Ohms
% Duty Cycle,
17 10
4 20
17 10
4 20
17 10
4 20
2 20
2 20
2 20
2 20
2 20
34 10
10 10
34 10
10 10
34 10
10 10
6 20
6 20
6 20
6 20
6 20
6 20
6 20
6 20
6 20
@ 100%
Braking
Ohms
46
6
46
6
46
6
6
4
4
4
4
100
24
100
24
100
24
12
12
12
12
12
12
12
12
12