Lenze i950

13.9.1.3 UL 508-compliant motor overload monitoring
If the
operaon of the motor requires the compliance with the UL Standard 508, and the UL
508-compliant motor overload monitoring is realised by the mathemacal model of the I²xt
monitoring, the following condions must be observed.
UL 508 condion 3:
Aer mains switching and a motor load > 100 %, the I²xt warning must be output faster than
in the same overload case before mains switching.
•
A mot
or load > 100 % exists if the r.m.s. value of the total motor current displayed in
parameter 0x2DD1:005 is higher than the rated motor current 0x6075.
This condion can be fullled by
seng the following parameters:
•
Mot
or
ulisaon (I²xt): starng value 40x2D4C:004
UL 508 condion 2:
In case of a motor load of 110 %, the I²xt warning at a motor rotang eld frequency of 10 Hz
must be output faster than at a motor rotang eld frequency of 20 Hz.
•
The curr
ent motor
rotang eld frequency is displayed in parameter 0x2DDD.
•
A motor load of 110 % exists if the r.m.s. value of the total motor current displayed in
parameter 0x2DD1:005 corresponds to 110 % of the rated motor current 0x6075.
This condion can be fullled by seng the following parameters:
•
I²x
t: x1 = n01/nN (n01 ~ 0) 40x2D4D:001
•
I²xt: y1 = i01/iN (x = n01 ~ 0) 40x2D4D:002
•
I²xt: x2 = n02/nN (n02 = reduced cooling limit) 40x2D4D:003
•
I²xt: y2 = i02/iN (x = n02 = reduced cooling limit 40x2D4D:004
UL 508 condion 1:
In case of a motor load of 600 %, the I²xt warning must be output within 20 seconds.
•
A mot
or load of 600 % exists if the r.m.s. value of the total motor current displayed in
parameter 0x2DD1:005 corresponds to 600% of the rated motor current 0x6075.
This condion can be fullled by
seng the following parameters:
•
Mot
or
ulisaon (I²xt): thermal me constant - laminated core 40x2D4C:002
•
Motor ulisaon (I²xt): inuence winding 40x2D4C:003
•
Mot
or ulisaon (I²xt): motor overload warning threshold 40x2D4E
•
Motor
ulisaon (I²xt): response 40x2D50:001
•
Motor ulisaon (I²xt): error threshold 40x2D50:002
Conguring the motor control
Motor protecon
Motor overload monitoring (i²*t)
295