Lenze 8400 StateLine - Manual (Page 244)

5 Motor control (MCTRL)
5.12 Monitoring
244
Lenze · 8400 StateLine · Reference manual · DMS 12.0 EN · 06/2014 · TD05/TD14
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Temperature model
[5-30] Signal flow for monitoring the brake resistor
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 ( 226)
 Error message: " oC12: I2xt overload brake resistor "
J
C00138
C00130
C00131
I
Br
I = 1
On
I = 0
Off
I xt 2
C00572 C00574
C00129
)
Temperature model

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
-------------------- =