A system which accomplishes the above functions in an
effective manner as well as providing additional protective
features such as oil pressure protection to ensure that the
system is not operated when oil pressure falls below a safe
value for more than a selected time interval and a low
voltage feature to avoid the possibility of causing contact
chattering or having one phase of a multiphase motor drop
out which would cause overworking of the remaining phases
is shown and described in US. Pat. No. 4,281,358 assigned
to the assignee of the present invention.