8400 StateLine C | Reference manual
Motor control (MCTRL)
Monitoring
238
L
Firmware
≤
11.00 - DMS 8.0 EN - 10/2011
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
:
During the calculation, the thermal utilisation of the brake resistor on the basis of the
following parameters is taken into consideration:
– 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
(
223)
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
--------------------
=
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