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Description of the Software Modules and Parameters
4.11.3 Overload monitoring of the power unit
NOTE!
At nominal load devices (peak current = nominal current) the current is limited to nom-
inal current. Additional monitoring and limitation is not required.
The thermal load factor (Ixt-actual value
calculated at nominal load devices and there is neither current limit nor PWM reduc-
tion.
Overload monitoring protects the power unit against thermal monitoring. Thereby thermal
load is emulated and monitored by a model. There are two methods for this:
Parameter Status PU temperature model
abled.
4.11.3.1 Ixt model
The thermal load of the complete device is emulated on the basis of apparent current and
peak current time.
Current controller
Iq actual value filtered
47.5
Current controller
Id actual value filtered
47.6
Figure 223:
Current controller Iq actual value filtered
Current controller Id actual value filtered
Apparent current actual value
LT nominal current 4 kHz / 8 kHz
LT maximum current 4 kHz / 8 kHz
m Temperature model (enabled, if complete thermal data set is available in the de-
vice's characteristics
(Z175.1–
bit 1 = 1, from V10.10 onwards)).
m Ixt model (is operated, if the temperature model is not enabled).
I
actual
2
2
x + y
Power unit
nominal current
(6.26)
Overload monitoring of the power unit (Ixt model)
Z6.27–
(Z175.2–
bit 3 = 1) and if the temperature model is selected
Z175.2–
PT1
1
Ixt
offset
t
J
actual
Power
temperature actual value
unit
130.1
(I
) [A
]
ist
eff
(I
) [A
]
nenn
eff
(I
) [A
]
max
eff
Parameter manual b maXX BM3000
Document no.: 5.12001.07
or the thermal load Z175.15–) is not
bit 0 displays, which method is en-
Display
6.27
It value [%]
5000_1004_rev02_int.cdr
47.5
47.6
2
2
47.5
+
47.6
6.26
6.25
4
Limitation on
Warning 206
LT monitoring
activated
723
of 820
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