Controls
Heat Switch:
Controls power to heater only.
Temperature Control:
Set and control temperature here. See
Page 14
for Controller information.
Relay Output Light:
This 250 volt RED pilot light is wired to the output side of the relay.
This light will cycle on & off with the control output light. It verifies that
the relay is working properly. 2 relays and lights are normally used.
Control Output Light:
A 250 volt GREEN pilot light is wired to the output side of the temperature
controller. This light should cycle on & off with the controller. It verifies that
the controller output voltage is going to the relay coil.
Power Switch:
Controls power to Controls. Shutting this switch off does not make it safe to
open the Control Box. Shut off power at main disconnect before servicing,
Power Light must be out before entering any part of this machine.
Belt Speed Control:
An AC
-
DC converter is mounted to the face of the control panel which allows
the operator to vary the DC volts to the motor.
DC Volt Meter:
Digital Volt Meter displays, in volts, the amount of power going to the belt
motor. This makes setting and adjusting belt speed much easier. A table
showing the time associated with voltage can be found in
Dryer Operation.
Heater Light:
This 6 volt WHITE pilot light is wired to the IR Heaters. One light per heater is
used. These lights indicate when electricity is flowing through each heater.
Power Lights:
Wired to the non
-
fused load switch. Will be illuminated whenever the load
switch is in the on position. At the end of the day, the machine should be
disconnected so this light is out.
Components found inside control box.
Relays:
EC
-
II Dryers may be equipped with SSR (Solid State Relays). The relays are the
switching devices which send the power to the heaters. The relay coil is wired to lug
#9 on the digital temperature controller. As the controller gets a signal from the sen-
sor, for heating or cooling, the relay opens and closes its solid state contactor to mod-
ulate power and maintain a consistent temperature. On 208V
-
240V units, each relay
is wired to an output light which helps to monitor their operation.
Fuses:
Two system fuses are found in the control box, and protect the internal electronics.
Pg. 9
