Lenze i700

Lenze · i700 servo inverter · reference manual · DMS 3.0 EN · 06/2016 · TD06 265
8 Monitoring functions
8.4 Monitoring of the motor utilisation (I²xt)
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UL 508 condition 2:
With a motor load of 110 % and a motor rotating field frequency of 10 Hz, the I²xt warning has to
be output faster than with a motor rotating field frequency of 20 Hz.
• The current motor rotating field frequency is displayed in the object 0x2DDD
(or 0x35DD for
axis B).
• A motor load of 110 % occurs if the r.m.s. value of the total motor current displayed in the object
0x2DD1:5
(or 0x35D1:5 for axis B) corresponds to 1.1 times the rated motor current (0x6075 or
0x6875
for axis B).
This condition can be met by the following parameter setting:
UL 508 condition 3:
After mains switching and a motor load > 100 %, the I²xt warning has to be output faster than in the
same load case before mains switching.
• A motor load of > 100 % occurs if the r.m.s. value of the total motor current displayed in the
object 0x2DD1:5
(or 0x35D1:5 for axis B) is higher than the rated motor current (0x6075 or
0x6875
for axis B).
This condition can be met by the following parameter setting:
Object Name Setting
Axis A Axis B
0x2D4D:1 0x354D:1 I²xt: x1 = n01/nN (n01 ~ 0) 0 %
0x2D4D:2
0x354D:2 I²xt: y1 = i01/iN (x = n01 ~ 0) < 100 %
0x2D4D:3
0x354D:3 I²xt: x2 = n02/nN (n02 = limit - reduced cooling)
Setting: 100 % * 20 Hz / rated motor frequency 0x2C01:5
or 0x3401:5)
0x2D4D:4
0x354D:4 I²xt: y2 = i02/iN (x = n02 = limit - reduced cooling) ≥ 100 %
Object Name Setting
Axis A Axis B
0x2D4C:4 0x354C:4 Motor utilisation (I²xt): Starting value > 0 %