Technical description 8100_A
13
4.2 OPERATINGWITHBRAKECHOPPER
When operating three-phase AC motors with static frequency inverters, the motor
feeds back energy to the DC bus when braking, Le. generating. If the DC bus voltage
exceeds a permissible value, the inverter sets trip for the time of overvoltage. The
reason for the overvoltage is that the rate of deceleration is not adapted to the load
inertia. When using a brake chopper, the excessive DC bus voltage is switched
across a resistor which dissipates the regenerated energy as heat until the DC bus
voltage falls below the switching threshold. Therefore short deceleration times with
large inertias are possible.
. ..1
~i-1
Conlrolvoltage L1 N PE
Operation with brake chopper
The PE connection can, in addition to the power plug, be bolted to the right terminal
clamp at the front side of the inverter. 8106_ A inverters must only be operated with
the correct mains choke. The power plug may only be connected or disconnected
when the device is without voltage.
*) For screening see 3.1
Screened cables and mains filters are necessary for radio interference
suppression to EN 55011, class A or B (see 3.2).
lenze
8100_A series 11
8101
8105
8102
8106
Peak brake power
11
300 W
1700 W
Maximum permanent
brake power
11 120 W I 250 W I
450 W
specified brake
resistor
(external)
I
82 0
Threshold voltage
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