Lenze EVS9332xK - Manual (Page 31)

Safety instructions
Thermal motor monitoring
Self−ventilated motors
2
2.2
2.2.2
l
2.2−3 EDSVS9332K EN 8.0−07/2013
2.2.2 Self−ventilated motors
Due to the construction, self−ventilated standard motors are exposed to an
increased heat generation in the lower speed range compared to forced
ventilated motors.
J
Warnings!
For complying with the UL 508C standard, you have to set the
speed−dependent evaluation of the permissible torque via code
C0129/x.
The following codes can be set for I 2 x t monitoring:
Code Meaning Value range Lenze setting
C0066 Display of the I 2 x t load of the motor 0 ... 250 % −
C0120 Threshold: Triggering of error "OC6" 0 ... 120 % 0 %
C0127 Threshold: Triggering of error "OC8" 0 ... 120 % 0 %
C0128 Thermal motor time constant 0.1 ... 50.0 min 5.0 min
C0606 Response to error "OC8" TRIP, warning, off Warning
C0129/1 S1 torque characteristic I
1
/I
rated
10 ... 200 % 100 %
C0129/2 S1 torque characteristics n
2
/n
rated
10 ... 200 % 40 %
0
0.9
0 0.1
C0129/2
0.2 0.3 0.4
0.6
0.7
0.8
1.0
1.1 1
0
0.132
2
I / IN
n / nN
C0129/1
3
9300STD350
Fig. 2.2−2 Working point in the range of characteristic lowering
The lowered speed / torque characteristic (Fig. 2.2−2) reduces the
permissible thermal load of self−ventilated standard motors. The
characteristic is a line the definition of which requires two points:
ƒ Point
0: Definition with C0129/1
This value also enables an increase of the maximally permissible load.
ƒ Point
1: Definition with C0129/2
With increasing speeds, the maximally permissible load remains
unchanged (I
Mot
= I
rated
).
In Fig. 2.2−2, the motor speed and the corresponding permissible motor
torque (
3) can be read for each working point (2on the
characteristic (
0) ... 1). 3 can also be calculated using the values in
C0129/1and C0129/2 (evaluation coefficient "y",
¶ 2.2−4).
Parameter setting
Effect of code C0129/x