Lenze L-force HighLine C 8400 Series Reference Manual page 285

Operating mode of the inverter motor brake
The ramp function generator is stopped during acceleration. The speed set in
added to the speed setpoint by means of a hysteresis-type 2-point DC bus voltage
controller, whereby the sign of the current actual speed is taken into account. In addition,
the ramp function generator is stopped during overvoltage.
If the DC bus voltage falls below a defined DC bus voltage potential of the hysteresis
controller, the added speed is subtracted again and the ramp function generator is
activated again.
The energy is converted into heat in the motor due to alternating instances of acceleration
and deceleration as a result of this switching operation.
Œ
DC-bus voltage
Speed setpoint for motor control
[5-32] Signal flow of the "Inverter motor brake" function
 In case of an asynchronous motor, the additive speed setpoint (C00987) should be 1 ... 4
times the slip of the machine:
p = number of pole pairs
n = Rated speed of the motor
Rat
f = Rated frequency of the motor
Rat
n = Synchronous speed of the motor
Sync
[5-33] Formula for calculating the additive speed setpoint for an asynchronous motor
 In case of a synchronous motor, the additive speed setpoint (C00987) should be
5 ... 20 % of the rated machine speed.
Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011
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nSpeedSetValue_a
QSP ramp
C00105
Inverter
motor brake
C00173 C00988
C00174
C00987
C00987 [rpm]
=
n
Sync
L
8400 HighLine C | Reference manual
Braking operation/brake energy management
QSP
C00909/1
C00909/2
0
1
1 ... 4 ⋅ ( n [rpm] n
–
Sync Rated
f [Hz] 60
⋅
Rated
[rpm]
= ----------------------------------- -
p
Motor control (MCTRL)
C00987

nEffSpeedSetValue_a
C00050
bLimSpeedSetVal
[rpm] )
is
285