The duty cycle of this pulse width modulated signal is increased linearly from a low duty cycle such as 20% to a high duty cycle such as 100% over a time interval which is adjusted to be at least several times the length of the average transition period for closure of {HEAD ~ the contacts} in {TAIL ~ the contactor} 
in
The duty cycle of this pulse width modulated signal is increased linearly from a low duty cycle such as 20 % to a high duty cycle such as 100 % over a time interval which is adjusted to be at least several times the length of the average transition period for closure of { HEAD ~ the contacts } in { TAIL ~ the contactor }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL