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A U TO M AT I C T R A N S F E R S W I TC H , OT M _ C _ 2 1 D
OTM_C_21D switching sequence
Line 1 Priority (default mode)
The switching sequence of OTM_C_21D can be
summarized in following steps:
• An anomaly occurs on the Line 1 (LN1)
• Switching delay Ts, in case of phase loss, over-
voltage and undervoltage conditions
• Generator start, immediate start generator
in case of black-out, in case of phase-loss,
overvoltage or undervoltage after switching
delay Ts. (if Generator mode is selected)
• Change-over switch (Switch I) to the position 0
• Change-over switch (Switch II) to the position II
LN1
LN2
Switch I status
Switch II status
Figure 2. Automatic Switching Sequences in OTM_C_21D, Line 1 priority
Ts
The back switching sequence can be summarized
in the following steps:
• The Line 1 will start the normal functioning
• Back switching delay Tbs
• Change-over switch (Switch II) to the position 0
• Change-over switch (Switch I) to the position I
• Generator stop delay Gs
• Generator stop
TBs
5
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