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2 Engineering
2.14 Regenerative braking
Rapid Link 5 · RAMO5 · RASP5
05/20 MN034004EN
www.eaton.com
77
2.14 Regenerative braking
In certain operating conditions, the motor may run as a generator in certain
applications (regenerative braking operation).
Figure 35:
Regenerative braking with external braking resistance
a
Machine flywheel mass
b
Inverter with brake chopper (brake transistor)
c
Brake resistor (R
B
)
→
Energy
fl
ow (braking torque)
Examples include:
•
Lowering in hoisting gear and conveyor applications
•
Controlled speed reduction in the case of large load inertias
(flywheels)
•
A fast speed reduction in dynamic travel drives
When the motor operates as a generator, its braking energy will be fed into
the variable frequency drive’s DC-Link via the inverter. The DC-Link voltage
U
DC
is increased as a result. If the voltage value is too high, the RASP5 varia-
ble frequency drive will disable its inverter. after which the motor will coast
uncontrolled.
If a braking chopper is present, the braking energy fed back into the drive can
be dissipated in order to limit the DC-Link voltage.
A braking chopper is integrated in the RASP5 speed controller.
The braking chopper function must be activated in parameter P4-05.
The braking chopper is switched on automatically if the braking energy being
fed back causes the DC-Link Voltage to increase to the switch-on voltage of
the braking chopper.
→
Only for RASP5-…-xxxx1xxS1
M
R
B
3
˜
①
②
③
ϑ
Содержание Rapid Link 5
Страница 1: ...Manual Rapid Link 5 RAMO5 RASP5 05 20 MN034004EN ...
Страница 4: ...II ...
Страница 38: ...1 Rapid Link 5 system 1 10 Service and warranty 34 Rapid Link 5 RAMO5 RASP5 05 20 MN034004EN www eaton com ...
Страница 118: ...3 Installation 3 7 Isolation test 114 Rapid Link 5 RAMO5 RASP5 05 20 MN034004EN www eaton com ...
Страница 196: ...8 Parameter list 8 4 Parameter groups for RASP5 192 Rapid Link 5 RAMO5 RASP5 05 20 MN034004EN www eaton com ...
Страница 246: ...10 Error Messages 10 2 Error Messages 242 Rapid Link 5 RAMO5 RASP5 05 20 MN034004EN www eaton com ...