means responsive to the inverter power for generating {HEAD ~ a first input signal} having {TAIL ~ a frequency} equal to the inverter power frequency divided by a first factor 
means responsive to the inverter power for generating { HEAD ~ a first input signal } having { TAIL ~ a frequency } equal to the inverter power frequency divided by a first factor
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH