Misprints and technical changes reserved
Instruction and Operation Manual
9
Calculation Peak Load P
MAX BRAKE
P
𝑀𝐴𝑋 𝐵𝑅𝐴𝐾𝐸
=
n
𝑀𝐴𝑋
× M
𝑀𝐴𝑋
9550
=
2400 × 100
9550
=
25,1 kW
P
MAX BRAKE
in [kW]
peak load brake chopper
n
MAX
in [min
-1
]
max speed
M
MAX
in [Nm]
max brake torque
Calculation RMS Brake load P
BREAK RMS
𝑃
𝐵𝑅𝐴𝐾𝐸 𝑅𝑀𝑆
= 𝑃
𝑀𝐴𝑋 𝐵𝑅𝐴𝐾𝐸
× √
t
BRAKE
3 × (t
RUN
+ t
BRAKE
+ t
OFF
)
= 25,1 × √
3
3 × (14 + 3 + 3)
= 𝟓, 𝟔 𝐤𝐖
P
BRAKE RMS
in [kW]
RMS brake load
P
MAX BRAKE
in [kW]
peak load brake chopper
t
BRAKE
in [seconds]
brake time
t
RUN
in [seconds]
motoring operation
t
BRAKE
in [seconds]
regen operation
t
OFF
in [seconds]
stop
Calculation Brake Resistor
R =
𝑈
2
𝑃
𝑀𝐴𝑋 𝐵𝑅𝐴𝐾𝐸
=
750
2
25100
= 22,4 Ω
R
in [
Ω
]
brake resistor
U
in [V]
(turn-on) voltage
P
MAX BRAKE
in [W]
peak load brake chopper
Brake Chopper selected from table 2.2
(refer to technical data)
Brake chopper BC2.2-90/13 Part.-No. 12272-0F
Chopper voltage 750V
Permanent Load:
P
BRAKE RMS
=
5,6 < 13 kW
OK
Peak Load:
P
MAX BRAKE
=
25,1 < 90 kW OK
Brake Resistor:
R=
22,4 > 11,2
Ω
OK
