3. ELECTRICAL INSTALLATION 31Plots of I2t Against Drive Current

The following graphs plot drive current against I2t time in seconds for a moving and

stationary motor for both power versions of the drive.

0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10 11 12 13 14 15 16 17 18 19 20
0
Time to trip I2t circuit in seconds
ViX250 I2t function - moving
ViX250 demanded phase current in A rms

Figure 3-13.ViX250 I2t function - moving

0
1
.2
2
.4
3
.6
4
.8
5
1
6
1.2
7
1.4
8
1.6
9
1.8
10
2 2.2 2.4 2.6 2.8 33.2 3.4 3.6 3.8 4
0
Time to trip I
2
t circuit in seconds
ViX250 I
2
t function - stationary

ViX250 demanded phase current in A rms

Figure 3-14.ViX250 I2t function - stationary