Technical data 321
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 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.
I
2rms
I
2peak
I
2contxk
0.75×
I
2contxk
I
2max
I
2contxk
Summary of Contents for ACL30
Page 1: ...ABB high performance elevator drives User s manual ACL30 elevator drive ...
Page 4: ......
Page 20: ...20 Safety instructions ...
Page 34: ...34 Operation principle and hardware description ...
Page 42: ...42 Planning the cabinet installation ...
Page 60: ...60 Planning the electrical installation ...
Page 126: ...126 Using the control panel ...
Page 318: ...318 Maintenance ...
Page 334: ...334 The Safe torque off function ...
Page 338: ...338 Mains chokes ...
Page 342: ...342 EMC filters ...
Page 348: ...Dimension drawings 348 Frame size B D1 D2 W H1 H2 ...
Page 349: ...Dimension drawings 349 ...
Page 350: ...Dimension drawings 350 Frame size C D1 D2 H2 H1 W ...
Page 351: ...Dimension drawings 351 ...
Page 352: ...Dimension drawings 352 Frame size D ...
Page 354: ...354 Dimension drawings EMC filters JFI 0x ...
Page 356: ...356 Dimension drawings Brake resistors JBR xx ...
Page 358: ...358 Dimension drawings ...