9400 highline | parameter setting & configuration – Lenze E94AxHE Servo Drives 9400 HighLine (Firmware 01-37) User Manual
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Firmware 1.37 - 09/2006
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9400 HighLine | Parameter setting & configuration
Motor interface
Parameter setting | Motor monitoring (I²xt)
Structure of the I2xt monitoring
The introduction of a two-component model with two time constants (one for the winding
and the other for the housing/steel plates) serves to display the thermal behaviour of the
motor up to 500% of the rated current:
[5-11] Structure of the motor monitoring
Executing the calculation with only one time constant
With the setting
= "0 %" the time constant for the winding is not considered and
the thermal model is only calculated with the time constant set for the housing/steel
plates.
r
The setting
= "0 %" is e.g. sensible if not both time constants are known.
r
The calculation simplified due to this setting corresponds to the calculation in the
previous Lenze devices (e.g. servo inverter 9300 or ECS).
n
Thermal utilisation of the motor in [%]
k
1
1
(1 + p
)
t
1
k
2
1
(1 + p
)
t
2
I
act Motor
I
perm Motor
(n)
2
Parameters
Setting
I
act motor
Current motor current
-
I
perm motor
(n)
Permissible motor current (speed-dependent)
-
τ
1
Therm. time constant coil
k
1
Percentage of the winding in the final temperature
τ
2
Therm. time constant plates
k
2
Percentage of the steel plates in the final temperature