model 2704 controller installation and operation handbook - Soliton

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Programmer Operation 2704 Controller 6.3.7. Wait Three wait conditions are provided at the end of each segment which may be wired, in configuration level, using a ‘Toolkit Block’ expression or by a digital input. Each segment may then select No-Wait, Wait on Event A, Wait on Event B or Wait on Event C. When all profile segments are complete, and the configured wait event is active, the program waits until the wait event becomes in-active before progressing to the next segment. Programmer Event A or digital input Event OP WaitA WaitB WaitC Event B or digital input Event OP Segment 1 extended by the wait period Segment 3 extended by the wait period Segment 1 Segment 2 Segment 3 Wait = Wait on Event B Wait = Wait on Event A Wait = OFF Figure 6-2: Wait Events See Section 6.7.4. for a description of operation. 6-6 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Programmer Operation 6.3.8. Holdback (Guaranteed Soak) Holdback freezes the program if the process value does not track the setpoint by an amount which can be set by the user. It may operate in any PSP type. In a Ramp it indicates that the process value is lagging the setpoint by more than a pre-set amount and that the program is waiting for the process to catch up. In a Dwell it will freeze the dwell time if the difference between SP and PV exceeds pre-set limits. In both cases it guarantees the correct soak period for the product. See also section 6.7.2. Holdback may be configured in three modes: • OFF - holdback does not operate • Applied to the complete program. Holdback operates the same way in every segment • To each individual segment. A different holdback type can be applied to each segment Holdback Type defines how holdback operates. It may apply when: • The PV is below the SP by a pre-set value (Lo), • The PV is above the SP by a pre-set value(Hi) • The PV is below or above the SP by a pre-set value (Band). In addition two levels of holdback are available per profile setpoint, per program. These are defined as ‘Fine’ and ‘Course’. Example: Holdback, operating in each segment, is often used in a temperature control application as detailed below:- During a ramp up period the holdback type may be set to deviation low. If the Process Value lags the programmed rate of rise, holdback will stop the program until the PV catches up. This prevents the set program from entering the next segment until the PV has attained the correct temperature. During a dwell period the holdback type may be set to deviation band. This guarantees that the dwell or soak period operates only when the process value is within both high and low deviation limits. During a ramp down period the holdback type may be set to deviation high. If the process cannot cool at the rate set by the ramp down rate the program will be held until the process catches up. When a profile is placed into holdback the other profiles are (normally) not held. They continue and rendezvous at the end of the segment. Each segment may consist of up to three profiles. Two levels of holdback value, course and fine, may be applied for each profile of each segment in the PROGRAM EDIT Program page. Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 6-7
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2704 Controller Contents MODEL 2704
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2704 Controller Contents 5. CHAPTER
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2704 Controller Contents 13. CHAPTE
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2704 Controller Introduction 1. Cha
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2704 Controller Introduction ➃
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2704 Controller Introduction 1.4.1.
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2704 Controller Installation 2. CHA
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2704 Controller Alarm Operation 7.8
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2704 Controller Tuning 8. CHAPTER 8
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2704 Controller Standard IO 17. CHA
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2704 Controller Module IO 18. CHAPT
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2704 Controller Diagnostics 20. CHA
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2704 Controller Diagnostics Note 1.
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2704 Controller Appendix A A. APPEN
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2704 Controller Appendix A B. QUICK
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2704 Controller Safety and EMC Info
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2704 Controller Technical Specifica
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model 2704 controller installation and operation handbook - Soliton

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