Lenze E84DSxxx - Manual (Page 172)

5 Motor control (MCTRL)
5.9 Braking operation/brake energy management
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Lenze · 8400 protec StateLine · Reference manual · DMS 4.2 EN · 03/2013 · TD05
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5.9.1 Setting the voltage source for braking operation
The voltage threshold for braking operation is set via the mains voltage ( C00173 ) and the reduced
brake chopper threshold ( C00174 ). When this "brake chopper threshold" is exceeded, the response
selected in C00175 takes place in the DC bus. The selected function (e.g. use of a brake resistor)
serves to dissipate energy in the DC bus and reduce the DC-bus voltage.
• The "brake chopper threshold" is preset as follows so that it is higher than the specified mains
voltage ( C00173 ):
• This brake chopper threshold can be reduced by 0 ... 150 V by means of C00174 .
Example:
• A 400 V device has a maximum mains voltage of 420 V AC.
• Maximum stationary DC-bus voltage: 420 V AC * 1.414 = 594 V DC
•
C00173 has been set with the selection "0" for 400 V AC mains.
• This means that C00174 can be set to a maximum of 131 V DC (725 V DC - 594 V DC).
Mains voltage Brake chopper threshold
C00173 1-phase 3-phase 1-phase 3-phase
0 1ph 230V 3ph 400V DC380V DC725V
1 1ph 230V 3ph 440V DC380V DC735V
2 1ph 230V 3ph 480V DC380V DC775V
3 1ph 230V 3ph 500V DC380V DC790V
4 1ph 115V 3ph 400V DC205V DC725V

Stop!
The brake chopper threshold resulting from C00173 and C00174 must not exceed the
stabilised DC-bus voltage!