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2. Product overview
Figure 3. Automatic Switching Sequences in OTM_C_21D, No line priority
Generator is disabled in no line priority. Keep generator off in this mode.
2.2.3 Manual back switching 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, overvoltage 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
And the back switching sequence can be summarized in the following steps:
•
The Line 1 will start the normal functioning
•
Change-over switch stays in position II
•
An anomaly occurs on the Line 2 (LN2)
•
Change-over switch stays in position II
•
Change-over switch can be transferred manually back to position I
Figure 4. Automatic Switching Sequences in OTM_C_21D, Manual back switching mode
1SCC303015M0201 l ABB Installation and operating instructions, 34OTM_C_21D rev. B
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