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C4 Manual Rev 7.5.2
If the controller is equipped with internal solid state relay to control the
compressor, the output of the solid state relay is through pin 8 of P1, the 12 pin
power cable to the controller.
At the end of running a program from the front panel, the chamber control port
and the compressor control port will return to their original default positions of
high and low, respectively.
9.6 Field Calibration of Model C4 Controller
WARNING: Sigma Systems C4 Controllers obtain power from the chamber or
platform to which they are connected. The controllers do not
have protective side
covers on the chassis. It is imperative to disconnect the power to both the chamber
or platform and the controller (if separate) from the power source before removing
the controller. Look for an optional separate power cord going to the controller. If
the controller is equipped with a separate power cord, disconnect that cord also
before removing the controller. FAILURE TO HEED THIS WARNING WILL
LIKELY RESULT IN SEVERE DAMAGE TO THE CONTROLLER AND DANGER
OF HIGH VOLTAGE ELECTRICAL SHOCK TO THE USER.
Equipment Required:
Digital volt meter capable of four digits accuracy.
Decade resistance box capable of 0.1 ohm resolution.
IMPORTANT: Before beginning the calibration process, the software probe
correction must be set to default values (no correction). If this is not done,
calibration may not be possible due to range limitations of the calibration
potentiometers. In addition, the temperatures reported by the probe(s) will be
incorrect. Incorrect calibration can result in extreme and/or unexpected
temperatures that will likely result in damage to equipment and test specimens,
and harm to personnel.
Procedure:
3. Be certain that the probe correction parameter fields are set to default (no
correction) values. With the temperature scale (setup parameter F16=0) set
to /C, setup parameters F17, F18, F21, & F22 should be set to 0 and setup
parameters F19, F20, F23, & F24 should be set to 100.
2. Remove power from the unit.
Access the controller chassis by removing the
screws at the four corners of the controller front panel.