Lenze E84AVHC Series - 5.10.2 Selecting the response to an increase of the DC-bus voltage

Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010 L 193
8400 HighLine | Parameter setting & configuration
Motor control (MCTRL)
Braking operation/braking energy management
5.10.2 Selecting the response to an increase of the DC-bus voltage
If the brake chopper threshold resulting from C00173
and C00174 is exceeded in the DC
bus, the reaction selected in C00175
takes place (use of the brake resistor and/or stop of
the ramp function generator and/or inverter-motor brake).
 Optimum following of the actual speed value until the speed setpoint is reached (e.g.
the motor is stopped rapidly) is always achieved with the help of a brake resistor.
 Stopping the ramp function generator enables smoother deceleration with lower
torque oscillation..
 As of version 04.00.00, the inverter-motor brake is available for selection in C00175
.
This function enables rapid braking without a brake resistor. Torque oscillations can
occur due to the traversing dynamics.Inverter motor brake
( 194)
The way in which the different braking procedures work is demonstrated schematically in
the following illustration:
[5-27] Graph of the effective speed setpoint and the DC bus voltage during braking
 Stop!
• The two braking procedures "Stopping of the ramp function generator" and
"Inverter motor brake" can only be used for speed-controlled applications
without the influence of a position controller!
• Do not additionally adapt
the motor load (I2xt) if the inverter motor brake is
used!
Otherwise, the motor has a risk of thermal overload, or the Motor load
monitoring (I2xt) does not properly work, respectively!
 Use of the brake resistor (C00175 = "0: Brake resistor")
 Stop of the ramp function generator (C00175
= "1: HlgStop")
 Inverter motor brake (C00175
= "3: FU_MotBrk + HlgStop)
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Set
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Set
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12
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Set
t
0
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DC
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DC
U
DC
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