Winding
thermostats are snap-action, bi-metallic, temperature actuated switches
normally installed in the connection end turns of the motor winding. Their
purpose is to activate a warning device, or shut down the motor upon excessive
winding temperatures.
Thermostats
are made with contacts that are either normally closed (N.C. - open at high
temperatures) or normally open (N.O. - closed at high temperatures). The
thermostat temperature switch point is pre-calibrated by the manufacturer and
is not adjustable. Reset is automatic after a decrease in temperature. This
feature allows the motor to cool before restarting. No control unit is required
for use with thermostats.
The
normal procedure is to wire three thermostats together as a set, with one
thermostat embedded in each phase. Normally open thermostats are wired in
parallel internal to the motor. Generally normally open thermostats are used to
activate a warning alarm (bell, light, etc.)
No comments:
Post a Comment