Lenze 931E/K Small Drives Control - Manual (Page 143)

Appendix
Parameterisation of outside motors
DC−bus monitoring
10
l
143 SW−HB 13.0002−EN 4.1
10.1.7 DC−bus monitoring
In special applications, e.g. rapid acceleration or braking of axes with high masses, the
DC−bus voltage may suddenly break down or become too high when the selected power
supply unit is not powerful enough or not able to feed back the power. If the DC−bus
voltage becomes too high (overvoltage > 70 V), the 931E/K servo positioning controller will
switch off the power stage. This is a safety function and can therefore not be
parameterised.
If parameterised by the user, an error can be activated in case of too low DC−bus voltages.
Select Parameters
W Device parameters W DC bus monitoring to activate the menu.
931e_292
The Rated DC−bus voltage field indicates the voltage the power stage has been designed
for. This value cannot be changed.
Use the Undervoltage detection field to select the response threshold below which the
voltage must fall before the controller will detect an undervoltage. Depending on the
power supply unit, useful values are 50 % ... 70 % of the rated DC−bus voltage.
)
Note!
Selecting an undervoltage detection < 50 % does not make any sense because
the power supply unit cannot supply the power in this case required by the
controller. Use a more powerful power supply unit!
Use the Troubleshooting field to select how the servo is to respond to an undervoltage
detection. This setting can also be selected in the "Error management". See the chapter
"Error management". (
¶ 132).