Rockwell Automation Allen-Bradley IntelliVAC 1503VC-BMC5, User Manual

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Rockwell Automation Publication 1503-UM053C-EN-P - March 2015 41
Appendix
A
Contactor Drop-out Time Settings
Typical Settings
The contactor drop-out time settings shown in the following table are typical
minimum values used when the power fuses are provided as part of a complete
MV controller from Rockwell Automation. The recommendations are based on
Ferraz-Shawmut power fuses. Other fuse types may require alternate drop-out
time settings.
The IntelliVAC module DIP switches are designed to provide the minimum
drop-out times shown, see
Chapter 4 .
Table 13 - Typical Contactor Drop-Out Time Settings
IMPORTANT
The drop-out time is chosen to be equal to or greater than the intersection of
the rated contactor interrupting current and the fuse melt time curve (except
where noted *).
Fuse Rating
Contactor Drop-out Time Setting (ms)
Voltage Designation 400A 800A
2R
3R
4R
6R
9R 50
12R
18R 50
19R
<5000 24R 100
32R 240
38R
(1)
48X
(1)
75
57X
(1)
200
2 x 24R
(1)
100
2 x 32R
(1)
240*
2 x 38R
(1) (1)
2 x 48X
(1) (1)
2 x 57X
(1) (1)