Section 4
Controls Overview
Page 4-1
4.1 Power Switch: The main power I/O (on/off ) switch controls all power
to the unit and must be in the I/on position before any systems are
operational.
4.2 Main Temperature Control: This control is marked SET
TEMPERATURE. It has two digital displays. Top Display reads
PROCESS TEMPERATURE and bottom display reads SET POINT
TEMPERATURE. The control is a 40-Step Ramp and Soak
Programmable Control with one (1) Event Output.
4.3 TEC Activated Light: This pilot light is ON when the peltier device is
actively heating or cooling the chamber. Under normal operating
conditions, this light should be “on” all of the time.
4.4 Over Temperature Limit Thermostat (OTL): This controller is
marked SET OVER TEMPERATURE and is equipped with an
adjustment knob and a graduated dial. Completely independent of the
Main Temperature Controller, the OTL guards against any failure of
the Main Temperature Controller which would allow temperature to
rise to a level that would damage the incubator or the material
contained within. If temperature rises to the OTL set point, the OTL
takes control of the peltier unit and prevents the temperature within
the incubator from rising further until the problem can be resolved, or
service can be arranged. In the event the main controller fails and the
unit is operating by means of the OTL safety, the temperature will
become unstable. Therefore product should be transferred to another
unit, the unit should be shut off and Technical Services contacted to
repair the unit to avoid potential product and/or further equipment
damage.
4.5 Over Temperature Activated Light: This pilot light comes on when
the “SET OVER TEMPERATURE” Limit Thermostat has been
activated. Under normal operating conditions this light should never
come on.
4.6 Fuse: Located on the back near the top inside of the cord inlet. The
fuse offers protection against over current conditions. If the fuse is
blown, the unit will shut down and the cause should be determined
and corrected before replacing the fuse/fuses.
4.7 RS485: Electrical connection for communicating with the Watlow
controller. Additional software is required, like Watlow EZ Zone
Configurator, Watlow SpecView, or National Instruments LabVIEW.
Summary of Contents for Thermo Fisher 3900 Series
Page 5: ...Preface iv...
