Commercial Oven Starts Exhaust Fan:
In the example shown, the
equipment is an electric conveyor oven installed in an institutional
kitchen. For safe operation, an exhaust fan must run whenever the oven is
on. The fan is connected to a completely different power supply box, but
must be switched ON whenever the oven is operating. An ECS Series current sensor sensing
overcurrent is selected for the application. The trip point of the ECS is
set below the normal operating current of the oven’s heater coils. When
the oven coils are energized, the ECS senses the current flow and its
output energizes. The isolated SPDT relay output contacts of the ECS are then used to energize
the exhaust fan. The high temperature limit switch is a safety backup
control that only operates if the fan relay fails to energize.
Laundry Dryer Starts Exhaust Fan:
In a high rise building, any one
of many laundry dryers can be in operation at any time. The ECS Series
sensing overcurrent is used to provide isolation so that any one of the
dryers will energize an exhaust fan. Current sensors are used for similar
solutions in industrial applications.
|
 |
