Avoiding Thermal Overload Of The Brake Resistor - Lenze 8400 StateLine C Reference Manual


How to set the "inverter motor brake" function for a maximum acceleration ramp:
For V/f characteristic open-loop control/closed-loop control (VFCplus):
• Set reduced brake chopper threshold (C00174) to approx. 70 V.
• Set additive speed (C00987) to 1,5 ... 2,5-fold rated slip speed.
• Adapt the deceleration ramp so that the deceleration time is slightly below
(10 ... 30 %) the deceleration time that can be realised with the inverter motor
brake.
For sensorless vector control (SLVC):
• Set reduced brake chopper threshold (C00174) to approx. 70 V.
• Set additive speed (C00987) to 2 ... 4-fold rated slip speed.
• Adapt the deceleration ramp so that the deceleration time is slightly below
(10 ... 30 %) the deceleration time that can be realised with the inverter motor
brake.
5.11.3

Avoiding thermal overload of the brake resistor

 Parameterisation of an error response in
error message within the application or within the machine control system.
– See chapter entitled
 External interconnection using the thermal contact on the brake resistor (e.g. supply
interruption via the mains contactor and activation of the mechanical brakes).
Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
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8400 StateLine C | Reference manual
Braking operation/brake energy management
C00574
"Brake resistor monitoring
L
Motor control (MCTRL)
and evaluation of the parameterised
(I2xt)".
( 237)
231