Lenze 8400 motec - Manual (Page 178)

5 Motor control (MCTRL)
5.14 Monitoring
178 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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The monitoring function calculates the braking current I
Br
from the current DC-bus voltage U
DC_act
and the brake resistance parameterised in C00129 :
• The calculation considers the thermal utilisation of the brake resistor based on the following
parameters:
• Resistance value ( C00129 )
• Continuous power ( C00130 )
• Thermal capacity ( C00131 )
• In the Lenze setting these parameters are preset with the corresponding power-adapted Lenze
brake resistor.
• C00133 indicates the calculated utilisation of the brake resistor in [%].
• A utilisation of 100 % corresponds to the continuous power of the brake resistor depending
on the maximally permissible temperature limit.
Related topics:
 Braking operation/brake energy management ( 163)

Note!
The monitoring function can also be triggered due to a value entered in C00129
although a brake resistor is not even connected.
I
Br
U
DC_act
C00129
-------------------- =