Sigma C4 manual Fail-safe System

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Some errors, especially those unique to the C4, are only defined in the Error/Status String. In the event of one of these errors, bit 1 of the Error Byte (this bit was not used by the CC-3) is set to indicate an extended error. The Status Byte and SRQ are thus set as well.

The Error/Status String is a bit mapped 64 byte string (512 bits) that contains both “event triggered” and “status monitoring” information. A complete description of the Error/Status String and it’s behavior can be found in Section 7.8.3.

3.10 Fail-safe System

The C4 is designed to sense the loss of control circuit power due to opening of a safety limit switch such as those supplied with all Sigma chambers and thermal platforms. If the controller is in the RUN mode and the fail-safe is tripped, the

controller will stop controlling and display fl safe on the digital LED

display. It will also report the fail-safe tripped condition over the computer bus interface if in use. In order to re- establish normal operation, the failsafe system on Sigma chambers and thermal platforms requires that power be cycled off then on in addition to the out of range temperature condition subsiding. Use the rotary Mode Switch on the controller front panel. Turn the switch to OFF to clear the fail-safe condition.

If the controller is to be used independently of a Sigma Systems temperature chamber or thermal platform, connect pins 10 & 11 of the 12-pin power plug to pin 3 for 120 volt operation. In the case of 208-240 volt operation connect pins 10 &

11 to pin 6 through a 56kS ½ watt resistor. Opening this connection will cause the above described failsafe condition.

C4 Manual Rev 7.5.2

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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 ConnectionsStartup Displays General Operation & Error ConditionsC3-5 Rel 200 100c 392 148fUpdating Firmware Upgrading Firmware by Prom Replacement Making the physical connection for upload Ee busy and then su done Restoring Setup Parameters to Default ValuesRs load Su resC4 Manual Rev Fahrenheit Operation P1fProbe Out of Range Shutdown System Operating Temperature RangeP1 lo P1 hi P1 err P1 -err All res Internal Error Shutdown ConditionsRes err 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 OperationDisplaying and Changing the Setpoint S1 102.6 s1fS1 nsp S1f nsp Controlling to a Setpoint Sor -sorSp err C4 Manual Rev Description of a Program Step Program Mode06.0 00.2 Substep Step Data 00.000.1 Ramp timeMaximizing Ramp Speed & Other Ramp Considerations Displaying Program Steps not during execution Clearing Program Memory Reinitializing program stepsPress CLEAR/ENTRY Entering or Changing a Program StepInsert Program Step Running Executing a Program Delete Program stepPress CLEAR/ENTRY Press CLEAR/ENTRY again Program Run Time Information/Considerations 005 sor Sor 007 nop2Loop Special Commands External Compressor On Common Programming Issues C4 Manual Rev IEEE-488 Interface Remote ModeEIA-232 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 Auto-start Mode Setup field Changing the Value of a Setup FieldTwo Probe 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 Appendix00.4 00.000.2 00.3Using shortcuts to shorten program entry time DISP/CNTLSTART/STOP 9900CLEAR/ENTRY 6 Enter 04.4 04.004.2 04.307.4 07.007.2 07.3C4 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