Selecting The Response To An Increase Of The Dc-Bus Voltage - Lenze 8400 StateLine C Reference Manual

8400 StateLine C | Reference manual
Motor control (MCTRL)
Braking operation/brake energy management
5.11.2

Selecting the response to an increase of the DC-bus voltage

If the brake chopper threshold resulting from
bus, the reaction selected in
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..
From version

This function enables rapid braking without a brake resistor. Torque oscillations can
occur due to the traversing dynamics.

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!
• When the "inverter motor brake" function is used, the
(I2xt)
being thermally overloaded or the motor overload monitoring does not work
properly!
• The "inverter motor brake" function must not be used with vertical conveyors
(hoists) or with active loads!
The way in which the different braking procedures work is demonstrated schematically in
the following illustration:
n
Set
U
DC
 Use of the brake resistor
 Stopping of the ramp function generator
 Inverter motor brake
[5-26] Graph of the effective speed setpoint and the DC bus voltage during braking
226
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
C00175 takes place (use of the brake resistor and/or stop of
04.00.00, the inverter motor brake is available for selection in C00175.
is not adapted. If it is braked too frequently, there is a risk of the motor
0
n
Set
t
U
DC
t
(C00175 = "0: Brake resistor")
(C00175
(C00175 = "3: FI_MotBrk + RfgStop)
L
C00173 and C00174
Inverter motor brake
( 228)
Motor load monitoring
1
n
Set
t
U
DC
t
= "1: HlgStop")
Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
is exceeded in the DC
2
t
t