Sigma C4 manual 102

3.Remove probe connections at the controller's rear terminal strip, J1-1 and J1-4.

4.Locate test points TP1 and TP6 (TP2 on CC-3.5) and adjustments R5 (R29 on CC-3.5) and R2 (R32 on CC-3.5) in the upper rear area of the right hand circuit board (B- board see fig.).

5.Apply power to unit and turn power switch on.

6.* With nothing hooked to the probe inputs of the controller, adjust R5 (R29) until the voltage at TP1 reads 7.100 volts +\- 0.005 . and adjust R2 (R32) until the voltage at TP6 (TP2) reads 1.70 volts +\- 0.05.

7.Securely connect the resistance box across the probe-1 inputs, (J1-1 and J1- 4) set the resistance box to 500.0 ohms. Adjust R2 (R32) slightly until the controller front panel reads exactly P1 0.0 (no minus sign). Value should already be within +/- 5 degrees C.

8.With the resistance box still across the probe-1 inputs, (J1-1 and J1-4) set the resistance box to 695.0 ohms. Adjust R5 (R29) slightly until the controller front panel reads exactly P1 100.0.

9.Recheck that the controller still reads 0.0 with 500.0 ohms at input. If it takes more than 3 iterations of these adjustments to calibrate the controller, the controller is in need of repair work.

10.Remove power from unit, reinstall controller into unit.

11.Controller response rate can be adjusted as follows. With the rotary switch in the SETUP mode, press ADV until F0 = 4 to 6, then press ENTER. Higher numbers represent larger proportional term and thus a slower controller response (lower gain) and lower numbers represent faster response (higher gain). See Section 9.8.

* This step may be omitted if calibration error is less than +/- 5.0 degrees C.

102 C4 Manual Rev 7.5.2