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C4 Manual Rev 7.5.2
2. PHYSICAL DESCRIPTION
The SIGMA SYSTEMS Model C4 Controller fits into an area 3.5" x 5.5" x 9.5"
long. Connection to the chamber or platform is made through an umbilical cable
with a 12 pin connector that is standard for all SIGMA chambers and thermal
platforms. Controllers destined for use with SIGMA thermal platforms have an
additional 6 pin connector used for the sensor probe circuits. All C4 controllers
have a 3 pin “pigtail” connector at the back of the controller for control of
refrigeration via solid state relay. This feature was optional on CC-3 controllers
and is thus not a consistent feature of CC-3
.5
controllers.
2.1 Front Panel
The front panel consists of four major parts: the LED digit display, the LED
indicators, the mode switch and the keypad. The numbers in circles on the front
panel guide the user through the steps for changing the temperature setting in
the LOCAL (manual) mode of operation. See Section 5.
2.1.1 Digital LED Display
The Digital LED Display is a 7 digit display arranged in the following
configuration:
***-****
The display is used for showing probe temperatures, setpoints, program steps,
fail-safe status and setup information.
2.1.2 LED Indicators
Below the Digital LED Display are four discrete LED Indicators. These indicators
are arranged in the following order:
REFER
COOL
HEAT
RUN
REFER indicator lights if power is applied to the refrigeration compressor
control port (not all units are equipped with compressors).
