Technical data
73
Cyclic loads
If the load cycle is shorter than 10 seconds, the thermal time constant of the heatsink (approximately 80
seconds) can be ignored, and the following simple procedure can be applied to find out whether the
drive can handle the cycle.
1. Determine the rms value (
I
2rms
) of the output current over the whole load cycle.
2. Determine the maximum instantaneous rms value (
I
2peak
) of the output current during the load cycle.
3. Determine the point (
I
2rms
,
I
2peak
) on the graph below.
If the point falls within the region bordered by a solid line, the load cycle is safe. For
I
2contxk
and
I
2max
,
use the ratings stated for the drive type and switching frequency used.
If the point falls within the shaded area, a more detailed study is required.
The above procedure can also be applied to longer load cycles by dividing the cycle into subcycles no
longer than 10 seconds. If any of the subcycles fail the test, a more detailed study is required.
The DriveSize dimensioning tool available from ABB is recommended for more detailed dimensioning.
I
2rms
I
2peak
I
2contxk
0.75×
I
2contxk
I
2max
I
2contxk
Summary of Contents for ACSM1 Series
Page 1: ...ACSM1 Hardware Manual ACSM1 04 Drive Modules 0 75 to 45 kW...
Page 2: ......
Page 4: ......
Page 14: ...Table of contents 14...
Page 20: ...About this manual 20...
Page 24: ...The ACSM1 04 24...
Page 30: ...Planning the cabinet assembly 30...
Page 46: ...Planning the electrical installation 46...
Page 70: ...Maintenance 70...
Page 84: ...Technical data 84...
Page 90: ...Mains filters 90...
Page 96: ...Dimension drawings 96 Frame size A...
Page 97: ...Dimension drawings 97...
Page 98: ...Dimension drawings 98 Frame size B...
Page 99: ...Dimension drawings 99...
Page 100: ...Dimension drawings 100 Frame size C air cooled module...
Page 101: ...Dimension drawings 101...
Page 102: ...Dimension drawings 102 Frame size C for cold plate mounting...
Page 103: ...Dimension drawings 103 Frame size D air cooled module...
Page 104: ...Dimension drawings 104 Frame size D for cold plate mounting...
Page 106: ...Dimension drawings 106 Mains filters type JFI xx...
Page 108: ...Dimension drawings 108 Braking resistors type JBR xx...
Page 110: ...Dimension drawings 110...
Page 111: ......