Sigma C4 Blower Shut-off Mode Setup field, Temperature Control Terms PID Setup fields 0, 10, 11

Page 85

Autostart is enabled, moving the mode from OFF to LOCAL will cause the controller to begin controlling to the last set local mode setpoint without the necessity of pressing <START/STOP>. If the system includes mechanical refrigeration, and the last local control session had the compressor turn on, it will be turned on for the Autostart session as well.

8.5 Blower Shut-off Mode (Setup field 15)

Normally at the end of a program execution, or in the event of a Fail-Safe shutdown condition, the blowers in an chamber will continue to run. If this is not desired, the blowers can be set to shut off under these conditions by enabling the blower shut-off mode by setting the value of setup parameter F15 to 1. Blower shut-off mode does not apply to Local mode.

8.6 Temperature Control Terms (PID) (Setup fields 0, 10, 11, 12)

The PID control terms that the C4 uses for temperature control are available in setup fields 0, 10, and 11. Do not change field 12. If you are not familiar with PID terms and their effects, a non-theoretical discussion can be found in Section 9.7.7 in the troubleshooting appendix of this manual.

8.7 Software Probe Correction (Calibration)

The C4 will allow you to enter data via Setup or Remote mode that will correct any anomalies in the temperature readings and control at two points. Such adjustments are sometimes necessary to optimize accuracy at a particular temperature, or to compensate for differences between raw probe temperature data and actual temperatures.

Note: The purpose of this feature is to allow precise calibration at two points near the critical points of the user’s testing scheme. It does not replace the hardware calibration process, nor should it. A number of system health checks as well as process limits are based upon the raw, or uncorrected, temperatures reported by the probes. It is important to optimize the hardware level calibration before using this software calibration method.

Software probe correction is achieved by entering four temperatures, U1, C1, U2,

&C2, for each probe into the setup parameter table. U1 & U2 are the uncorrected, or displayed, temperatures at two points. C1 & C2 are the corrected, or actual, temperature at those same two points. Thus to make a correction using

C4 Manual Rev 7.5.2

85

Image 85
Contents Sigma Systems Programmable Temperature Controller / InterfaceC4 Manual Rev Table of Contents Intelligent 2 Probe Control C4 Manual Rev C4 Manual Rev C4 Manual Rev C4 Manual Rev Models C4 & CC-3.5Explained IntroductionGeneral Description Release 7.5.2 Firmware Custom Features / Interchangeability WarningC4 vs. CC-3 Differences What’s New Firmware Uploads Forced Start from Prom Firmware Internal Error Shutdown Conditions Intelligent 2 Probe Control Probe Averaging Program Mode Step Insert & Delete RSA Remote Mode Setup Parameter Commands Front Panel Physical DescriptionMode Switch Clear Prog J1 TOP Rear Panel ConnectionsC3-5 Rel General Operation & Error Conditions200 100c 392 148f Startup DisplaysUpdating Firmware Upgrading Firmware by Prom Replacement Making the physical connection for upload Rs load Restoring Setup Parameters to Default ValuesSu res Ee busy and then su doneC4 Manual Rev Fahrenheit Operation P1fP1 lo P1 hi System Operating Temperature RangeProbe Out of Range Shutdown P1 err P1 -err Res err Internal Error Shutdown ConditionsAll res Software Probe Correction Calibration Su errStatus and Error Reporting Fail-safe System C4 Manual Rev Intelligent 2 Probe Control How Intelligent 2 Probe Control functions Preparing for Intelligent 2 Probe Control Using Intelligent 2 Probe Control Displaying Temperature Local Mode Basic OperationS1 nsp S1f nsp S1 102.6 s1fDisplaying and Changing the Setpoint Sp err Sor -sorControlling to a Setpoint C4 Manual Rev 06.0 Program ModeDescription of a Program Step 00.1 Substep Step Data 00.0Ramp time 00.2Maximizing Ramp Speed & Other Ramp Considerations Displaying Program Steps not during execution Clearing Program Memory Reinitializing program stepsInsert Program Step Entering or Changing a Program StepPress CLEAR/ENTRY Press CLEAR/ENTRY Press CLEAR/ENTRY again Delete Program stepRunning Executing a Program Program Run Time Information/Considerations Loop 007 nop2005 sor Sor Special Commands External Compressor On Common Programming Issues C4 Manual Rev EIA-232 Interface Remote ModeIEEE-488 Interface System Information Queries Command Summary by functional groupSystem Information Queries For Celsius mode For parameters numbered 0 through C4 Manual Rev Operation Information Queries & Commands REerror byteCRLF C4 Manual Rev Qccrlf PTnCRLF Setup Parameter Commands SC1 0 2.3 100 WP 6 5 5CRLF Upcrlf System Operation Commands Celsius mode Will hold the current setpoint for 1 hour and 20 minutes U1c 65.0 u1f IEEE-488 Gpib Error and Status Reporting OverviewTemperature in 20 minutes C4 Manual Rev Error/Status String Bit Definitions C4 Manual Rev Setup Mode PID controller, Integral term Adjustment not Displaying the Field Values Two Probe Mode Setup field Changing the Value of a Setup FieldAuto-start Mode Setup field Temperature Control Terms PID Setup fields 0, 10, 11 Blower Shut-off Mode Setup fieldEntering probe correction setup data C4 Manual Rev C4 Manual Rev Programming Examples & Notes Appendix00.2 00.000.3 00.4Using shortcuts to shorten program entry time DISP/CNTLSTART/STOP 9900CLEAR/ENTRY 6 Enter 04.2 04.004.3 04.407.2 07.007.3 07.4C4 Manual Rev Sigma Systems C4 Programming Worksheet Sample Command Structure for IEEE-488 Gpib Operation Disp A$ Installation and Use of TTL Outputs and Input 101 Field Calibration of Model C4 Controller102 103 TroubleshootingNoise Immunity 105 Firmware Upload Problems 107 Temperature Control PID Tuning & Problems108 109 110 111 Technical Support, Repairs & Returns U1f 102.7113 Index114 115 GpibIEEE488 Gpib 117 118 119 SRQ120