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4. Interface and Settings
4.3 Rotary switch setting
1. Switching delay Ts: The delay of switching from primary line to secondary line in automatic
mode; Choose from 0, 1, 2, 3, 5, 10, 15, 20, 25, and 30 seconds.
Back switching delay TBs: The delay of switching from secondary line to primary line in
automatic mode; Choose from 0, 5, 10, 20, 30, 60, 120, 300, 600, and 900 seconds.
2. Overvoltage threshold OV (%) and undervoltage threshold UV (%): The benchmarks of the
OV and UV are the rated voltage of the switch. When the voltage is higher than the preset
OV value or lower than the pre-set UV value, the switch performs automatic transfer.
The value of OV can be 5%, 10%, 15%, 20%, 25%, and 30%.
The value of UV can be 5%, 10%, 15%, 20%, 25%, and 30%.
Figure 12. Rotary switch, Ts and TBs
Figure 13. Rotary switch, OV and UV
1SCC303015M0201 l ABB Installation and operating instructions, 34OTM_C_21D rev. B
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