Lenze I95AE240F User Manual

13.9.1.1 Parameters for the thermal model
The introducon of a two-component model with two me constants (one for the winding
and the other f
or the housing/laminated core) serves to display the thermal behaviour of the
motors up to 500% of the rated current.
Structure of the monitoring
2
(1 + p )τ
2
1
k
2
(1 + p )τ
1
1
k
1
I
act Motor
I (n)
perm Motor
①
Thermal ulisaon of the motor in [%]
Parameter Symbol Descripon Dimension unit
- I
actMot
or
Actual motor current A
- I
permMotor
Permissible motor current (speed-
dependent)
A
0x2D4C:001 τ
1
Therm. me constant of winding s
0x2D4C:002 τ
2
Therm. me constant of laminated
core
s
0x2D4C:003 k
1
Percentage of the winding in the
nal temperature
%
- k
2
Percentage of the laminated core in
the nal temperature: k2 = 100 % -
k1
%
Calculaon with only one me constant
If k1 = "0 %" is set, the part of the winding is not taken into consideraon and the thermal
model is only c
alculated using the me constant set for the housing/laminated core. This set-
ting is e.g. required if only the me constant of the laminated core (T2) is known.
Parameter seng of the me constant and the inuence of the winding on motors of other manufacturers
When the inuence of the winding is acvated, the i
2
xt monitoring becomes more sensible as
if only the inuence of the laminated core would be used for monitoring purposes.
The necessity to acvate the inuence of the winding rises with the increasing ulisaon of
the motor overload capacity. It also rises with applicaons where the motor is at standsll for
longer periods or cyclically and a load ≥ permanent standsll current is applied.
For determining the values for the thermal me constant, try to get the data from the motor
manufacturer. If this is not possible, you can use the data of a comparable Lenze motor.
Condions for comparability are similar values in case of the following motor features:
•
Squar
e dimensions of the motor (acve part)
•
Leng
th of the acve part (if available)
•
Permanent standsll current Io [A_RMS]
•
Peak current/overload capacity [A_RMS]
•
Copper resistance of the winding at 20 °C [Rphase]
Example:
Motor features Data of the third-party motor Descripon
Square dimension 95 mm MCS09xxx = 89 mm
Standsll current 2.2 A MCS09F38 = 3.0 A
Peak current 7.3 A MCS09F38 = 15 A
Phase resistance 5.1 Ohms MCS09F38 = 5.2 Ohms
Conguring the motor control
Mot
or protecon
Motor overload monitoring (i²*t)
266

Lenze I95AE240F Specifications

General

Brand	Lenze
Model	I95AE240F
Category	Inverter
Language	English