Lenze EDB9300UES - Manual (Page 32)

Technical Data
BA8230 27
With this information you can calculate the rated motor torque MN and the braking
torque:
Motor rated torque
Braking torque
The ratio between braking torque and rated motor torque determines whether a power
dump is required.
At low braking torque (0.1 ... 0.2 x M
rated
) the drive system is braked by its own losses.
1. M
B
/M
nom
≤
0,1 ... 0.2 No power dump required
2. M
B
/M
nom
>
0,1 ... 0.2 Power dump required
2.5.2.1 Brake chopper The brake chopper is built in the 8230 frequency inverter, if version BE was ordered.
The table below shows the brake chopper with the relevant technical data for the
8230 frequency inverter types.
8230 frequency
inverter type Brake chopper
I
Br max
2) U
D
R
min
1) P
Br max
[A] [V] [
Ω
] [kW]
8231 300 750 2.5 225
8232 300 750 2.5 225
8233 600 750 1.25 450
8234 600 750 1.25 450
1) R
min
for 750V U
D
2)
Duty cycle = 100 %
Table 12: Brake chopper
Important!
In drive applications with a brake chopper the temperatures of the braking resistors
used must be monitored! If the monitor responds, the mains voltage at the power
input to the 8230 frequency inverter must be switched off, i.e. the monitor must trigger
a mains contactor on the 3AC supply to the 8230 frequency inverter.
nom
nom
nom
n
9550 P
M
∗
=
L
B
2 1
B
M
t 9,55
) n (n J
M
−
∗
−
=
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