Lenze 8400 motec - Manual (Page 164)

5 Motor control (MCTRL)
5.12 Braking operation/brake energy management
164 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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5.12.1 Settings for internal brake resistor E84DZEWxxxx
5.12.2 Voltage limits for braking operation
In case of the 8400 motec controller, the brake chopper is exclusively switched on via a hardware
circuit.
• For the braking methods C00175 = 2 / 4, a brake chopper threshold is used depending on the set
mains voltage ( C00173 ) in order to trigger the corresponding software response before the
brake chopper threshold on the hardware side is reached:
• The braking method C00175 = 6 increases the motor magnetisation every time the motor is
decelerated. There is no reference to the DC-bus voltage.
5.12.3 Response to an increase of the DC-bus voltage
If the brake chopper threshold in the DC bus is exceeded, the response selected in C00175 takes
place (use of the brake resistor and/or stop of the deceleration).
• 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 deceleration enables a smoother braking with lower dynamics and torque
oscillation.
• From version 02.00.00 , C00175 = 4 provides for the inverter motor brake. This function enables
a quick braking without using a brake resistor. Depending on the procedure, torque oscillations
may occur.
Resistance value
R
B
( C00129 )
Rated power
P
D
( C00130 )
Thermal capacity
Q
B
( C00131 )
E84DGDVB... Brake resistor [Ω] [W] [kWs]
3714
5514
7514
1124
1524
E84DZEW220R 220.0 15 0.3
2224
3024
E84DZEW100R 100.0 15 0.3
4024
5524
7524
E84DZEW47R0 47.0 15 0.3
C00173 Mains voltage Brake chopper threshold
0 3-phase 400 V AC 677 V DC
1 3-phase 440 V AC 735 V DC
2 3-phase 480 V AC 775 V DC