9300 servo plc, System blocks, Warnings – Lenze DDS Target 9300 Servo PLC V8.x User Manual
Page 84

2.12
MCTRL_MotorControl (node number 131)
9300 Servo PLC
System blocks
2−78
L
9300 Servo PLC EN 5.1
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.
Parameter setting
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 %
Effect of code C0129/x
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. 2−29
Working point in the range of characteristic lowering
The lowered speed / torque characteristic (Fig. 2−29) reduces the permissible thermal load of
self−ventilated standard motors. The characteristic is a line the definition of which requires two
points:
·
Point
0: Definition with C0129/1
This value also enables an increase of the maximally permissible load.
·
Point
1: Definition with C0129/2
With increasing speeds, the maximally permissible load remains unchanged (I
Mot
= I
rated
).
In Fig. 2−29, 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
C0129/1 and C0129/2 (evaluation coefficient "y",
¶ 2−79)