8 Monitoring functions
8.4 Monitoring of the motor utilisation (I²xt)
258
Lenze · i700 servo inverter · reference manual · DMS 3.0 EN · 06/2016 · TD06
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The introduction of a two-component model with two time constants (one for the winding and the
housing/laminated core, respectively) serves to display the thermal behaviour of the motors up to
500% of the rated current.
0x2D4C | 0x354C - Motor utilisation (I²xt): Parameter for the thermal model
Sub. Name Lenze setting Data type
1 Motor utilisation (I²xt): Response 0: No Response UNSIGNED_8
2 Motor utilisation (I²xt): Error threshold 105 % UNSIGNED_16
Subindex 1: Motor utilisation (I²xt): Response
Selection list (Lenze setting printed in bold)
0 No response
1Fault
Write access CINH OSC P RX TX UNSIGNED_8
Subindex 2: Motor utilisation (I²xt): Error threshold
Setting range (min. value | unit | max. value) Lenze setting
0 % 250 105 %
Write access CINH OSC P RX TX UNSIGNED_16
Structure of the monitoring
Thermal utilisation of the motor in [%]
Axis A Axis B Symbol Description Dimension unit
-- I
act motor
Actual motor current A
-- I
perm motor
Permissible motor current (speed-dependent) A
0x2D4C:1
0x354C:1 τ
1
Therm. time constant coil s
0x2D4C:2
0x354C:2 τ
2
Therm. time constant of the laminated core s
0x2D4C:3
0x354C:3 k
1
Percentage of the winding in the final temperature %
-- k
2
Percentage of the laminated core in the final temperature:
k
2
= 100 % - k
1
%
k
1
1
(1+p )
t
1
k
2
1
(1+p )
t
2
I
act motor
I
perm motor
(n)
2
Sub. Name Lenze setting Data type
1 Motor utilisation (I²xt): Thermal time constant
- winding
60 s UNSIGNED_16
2 Motor utilisation (I²xt): Thermal time constant
- laminations
852 s UNSIGNED_16
3 Motor utilisation (I²xt): Influence of the
winding
27 % UNSIGNED_8
4 Motor utilisation (I²xt): Starting value 0 % UNSIGNED_16
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