to lock into operation/to be locked into operation

English to Polish Tech/Engineering Engineering (general)

Fans start and lock into operation (3-5 seconds delay between fans on multi fan units).
Fans will not lock into operation when fan switch is released.
If voltage is present on terminal no. 1, check for voltage on terminal no. 2 while the fans are locked into operation.
None of the fan proven lights stay lit, after the fans lock into operation.