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Operating Instructions
37
Figure 20 One system in bypass to Continuous Tie operation (Option 1)
Figure 21 One system in bypass to Continuous Tie operation (Option 2)
M
1
M
1
SS
1
SS
2
M
2
M
2
System 1 System 2
Load 1 Load 2
Tie
M
1
M
1
SS
1
SS
2
M
2
M
2
System 1 System 2
Load 1 Load 2
Tie
FROM:
One System in Bypass Mode
Tie Open
Restart the bypassed system, then use the procedures in Tying the UPS Systems - Continuous
Parallel Operations (in Section 4.2.11) or see Figure 21.
LEGEND: M
x
= Module
SS
x
= Static Bypass Switch
M
1
M
1
SS
1
SS
2
M
2
M
2
System 1 System 2
Load 1 Load 2
Tie
Tie Closed
TO:
Continuous Tied Systems
TO:
Restart Bypassed System
Tie Open
Partial
or full
capacity
M
1
M
1
SS
1
SS
2
M
2
M
2
System 1 System 2
Load 1 Load 2
Tie
FROM:
One System in Bypass Mode
Tie Open
Combined loads on one system—See 4.2.4 - Isolating a UPS System for Maintenance - Combined
Loads Operation; restart bypass system. Then use Continuous Tie procedures—Tying the UPS
Systems - Continuous Parallel Operations in Section 4.2.11.
Restart one system, then refer to Figure 20. Or restart both systems, then refer to Figure 15.
LEGEND: M
x
= Module
SS
x
= Static Bypass Switch
M
1
M
1
SS
1
SS
2
M
2
M
2
System 1 System 2
Load 1 Load 2
Tie
Tie Closed
TO:
Continuous Tied Systems
M
1
M
1
SS
1
SS
2
M
2
M
2
System 1 System 2
Load 1 Load 2
Tie
Tie Closed
TO:
Combined Loads Operation
Momentary Tie
for transfer of
Load 2 to
System 1
Partial or
full capacity