13
AU TO M AT I C T R A N SFER S W I TC H , OT M _ C _ 2 1 D
Figure 12. Rotary switch, Ts and TBs
Figure 13. Rotary switch, OV and UV
Rotary switch settings
1. Switching delay Ts: The delay of switcing 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 under
voltage 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 preset 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 %.
