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Table 22. Current balance per line cord
1 BPR/side
2 BPRs/side
3 BPRs/side
4 BPRs/side
5 BPRs/side
4
6 BPRs/side
Note:
1. Unbalanced A - only two phases carry equal current. The third phase carries zero.
2. Unbalanced B - two phases carry equal current. The third phase carries 1.73 times the current carried by the
other two.
3. Balanced - all phases carry the same current.
4. Only available with FC 3003 (balance power).
Table 23. Current balance Example
Example 1 - Model H20 with 1 I/O unit
From Table 21 on page 68, the number of BPRs per side = 1
From Table 22, the phase currents are unbalanced A on the first line cord set (there is no second line cord set.)
Table 24. Current balance Example
Example 1 - Model H43 with 4 I/O units
From Table 21 on page 68, the number of BPRs per side = 3
From Table 22, the phase currents are balanced on the first line cord set (there is no second line cord set.)
Table 25. Current balance Example
Example 1 - Model H66 with 3 I/O units
From Table 21 on page 68, the number of BPRs per side = 4
From Table 22, the phase currents are balanced on the first line cord set. The phase currents are unbalanced A on the
second line cord set.
Table 26. Current balance Example
Example 1 - Model H89 with 4 I/O units
From Table 21 on page 68, the number of BPRs per side = 5
From Table 22, the phase currents are balanced on the first line cord set. The phase currents are unbalanced B on the
second line cord set.
Table 27. Current balance Example
Example 1 - Model HA1 with 5 I/O units
From Table 21 on page 68, the number of BPRs per side = 5
From Table 22, the phase currents are balanced on the first line cord set. The phase currents are unbalanced B on the
second line cord set.
1st cord set
1
unbalanced A
2
unbalanced B
3
balanced
balanced
balanced
balanced
Level 01f
2nd cord set
—
—
—
unbalanced A
unbalanced B
balanced
Chapter 5. Power requirements
69
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