Screening Services and Training                                                                                                                                            Last Update 10/06/2005
25092 Natama Ct                                                                                                                    Based upon a procedure written by Screening Systems, Inc.
Laguna Hills, CA  92653-5607

How to Adjust the SSCTM-2000 Controller Null Pacing, RampGuard, and SoakGuard Parameters.
 
Null Pacing

The Null Pacing capability of the SSCTM –2000 Controller monitors the differences between the Profile Temperature Command and the reading of the temperature device selected as the Temperature Feedback.  When the difference between these two values exceeds the operator-selected temperature difference limit of the SoakGuard or the RampGuard, the temperature Profile Generator holds at the present level, Vibration (if actively running) turns off, and the Null Pacing Mode Timeout timer starts counting.  This is called the Null Pacing Mode.

By holding these commands, the Profile Generator gives the Feedback temperature time to “catch-up” to the Command thus decreasing the difference between the values.  When the difference between these values decreases to 50% of the operator-selected temperature difference, SoakGuard or RampGuard settings, the Generator resumes the profile.

Null Pacing may be configured to automatically terminate a temperature profile after being continuously in the Null-Pacing Mode longer than the operator-selected Null Pacing Mode Timeout setting.  Selecting OFF will disable this Timeout feature.


SoakGuard

Located in the bottom row of the Program input pop-up window, this control allows the user to set the deviation between the Setpoint and the Feedback temperature that will cause the SSC™-2000 to enter the Null-Pacing Mode when in a Soak segment.  Any segment with identical starting and ending temperature Setpoint values is a Soak segment.  Selecting OFF in this control will disable the Null-Pacing Mode during all Soak segments.

In the figure below, the Soak guard is configured as 5 degrees, which means that the SSC™-2000 will enter the Null-Pacing Mode in any Soak segment whenever the Feedback temperature is more than 5 degrees above or below the current temperature Setpoint Command value.


RampGuard

Also located in the bottom row of the Program input pop-up window, this control allows the user to set the deviation between the Setpoint and the Feedback temperature that will cause the SSC™-2000 to enter the Null-Pacing Mode when in a Ramp segment.  Any segment with different starting and ending temperature Setpoint values is a Ramp segment.  Selecting OFF in this control will disable the Null-Pacing Mode during all Ramp segments.

Also in the figure, the Ramp guard is configured as 15 degrees, which means that the SSC™-2000 will enter the Null-Pacing Mode in any Ramp segment whenever the Feedback temperature is more than 15 degrees above or below the current temperature Setpoint Command value.

 
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