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4848T Reactor Controller, Front Side
Switches and Indicators
The MAIN POWER switch on the back of the con-
troller will cut off power to the controller. Take care
to position the controller such that the main power
switch may be accessed easily when the controller
needs to be disconnected.
COMPONENT SUMMARY
The HEATER Switch is a manual, three-position,
illuminated switch which controls the amount of
power sent to the heater. In the HIGH (II) position,
full power is developed by the heater. In the middle
(O) position the heater is off. In the LOW (I) position,
a diode is switched into the system to allow only one-
half of the rated voltage to be supplied to the heater.
This low setting will be most useful when operating
the reactor at temperatures below 175 °C. Power
for the heater is supplied through a solid state relay
controlled by the temperature control module. The
light in the heater switch will glow only when current
is flowing to the heater.
The HIGH LIMIT indicator light will glow if the
controller receives an indication from any of its
sensors that a high temperature or high pressure
limit has been reached and the HIGH LIMIT RESET
has opened. When the light comes on, the user
must find the source of the problem, correct it, and
then manually reset the system using the HIGH
LIMIT RESET button on the front of the controller.
The MOTOR CONTROLS consist of:
1. AUTO/MANUAL switch
2. ON/OFF (I/O) switch
3. SPEED control knob
The SPEED control knob should be turned down
to a minimum setting before turning on the motor
switch to minimize electrical surges within the
speed control unit.
When the auto/manual switch is in manual mode,
the speed control knob will adjust the motor stir-
ring speed. When the auto/manual switch is in
auto mode, the RPM module will adjust the motor
stirring speed.
4848T Reactor Controller with Touchscreen
7
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