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.
C4 Manual Rev 7.5.2 | 101 |
