Lenze 520 series Technische Beschreibung Seite 55

4Q DC Chopper 520 series
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Example: Using the quick stop function, rhe drive is decelerated with the current
‚max~ i.e. with constant torque. Ihis results in a linear decrease of the
speed and therefore the brake power. Ihe braking ‚nme
the brake torque the kinetic energy to be braked.
The required rated power
of the brake resistors results from:
Bremsen
Tr@iben
required rated power of the brake resistor
PN:
maximum motor voltage in the generator mode
UGen max
maximum motor current in the generator mode
‚Gen max
brake time
tBR:
time between twa brake cycles
tZYk:
maximum brake power during a brake phase
Pmax:
Wk~fl: maximal kinetic energy to be dissipated in heat during braking
motor efficiency
Mot:
Lenze
<~N~
Ihe maximum brake power results
from:
53
results frorn
(tBR)
t