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2
6.11.8 I
t Monitoring (Digital Axes Only)
2
I
t limit
December 2001
The instantaneous motor current is limited to either the maximum current of
the power supply unit, or the maximum motor current, whichever is lower.
The values result from the type of power supply unit and type of motor, and
are saved in the motor or power-supply-unit table.
2
In addition, I
t is monitored:
For this purpose, the squares of the actual current values are integrated. For
feed motors, the duration of integration is 10 s, for main spindle motors 150 s.
The power module's rated current or the reference value for "I
of the motor" is used as the I
7 7 7 7
Enter a reference value for I
• MP2302.x for feed motors
• MP2303 for the spindle motor
The input value is a factor of the rated current of the motor (1 = rated current
of the motor).
2
If you enter zero, the I
unit) is switched off.
If the mean current value from the integral exceeds the I
early warning signal responds.
If the mean current value from the integral exceeds the 1.1-fold value of the
2
2
I
t limit value, the I
t limit responds. Within 0.4 s the motor current is throttled
to the 1.1-fold value of the I
If the calculated mean current value falls below the 1.1-fold of the mean
current value, limiting is canceled.
Note
2
There is no I
t limitation for spindle drives.
MP2302.0-8 Reference value for I
for axes 1 to 9
Input:
0 to 1000.000 [· rated current of motor]
2
0: I
t monitoring of feed motors switched off
1: Rated current of motor as reference value
MP2303
Reference value for I
Input:
0 to 1000.000 [· rated current of motor]
2
0: I
t monitoring of spindle motor switched off
1: Rated current of motor as reference value
Monitoring Functions
2
t limit value, whichever is smaller.
2
t monitoring for both
t monitoring for the motor (not for the power supply
2
t limit.
2
t monitoring of feed motors
2
t monitoring of spindle motor
2
t monitoring
2
2
t limit value, the I
t
6 – 167
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