MODEL 2604 CONTROLLER - USER GUIDE - d a n m a r k

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Programmer Operation2604 Controller4.3. SETPOINT PROGRAMMER DEFINITIONSThis section defines the more common parameters to be found when running a 2604programmer /controller. For an explanation of further features see the Engineering Handbookpart no HA026761.4.3.1. RunIn run the programmer varies the setpoint in accordance with the profile set in the activeprogram.4.3.2. HoldIn hold the programmer is frozen at its current point. In this state you can make temporarychanges to program parameters such as a target setpoint, ramp rates and dwells (if programmerconfigured for ramp rate) or segment duration (if programmer configured as Time to Target).Such changes will only remain effective until the end of the currently running segment, whenthey will be overwritten by the stored program values.4.3.3. ResetIn reset the programmer is inactive and the controller behaves as a standard controller, withthe setpoint determined by the raise/lower buttons.4.3.4. ServoServo can be set in configuration so that when a program is run the setpoint can start from theinitial controller setpoint or from the current process value. Whichever it is, the starting pointis called the servo point. This can be set in the program.Servo to PV will produce a smooth and bumpless start to the process.Servo to SP may be used in a Ramp Rate programmer to guarantee the time period of the firstsegment. (Note: in a Time to Target programmer the segment duration will always bedetermined by the setting of the Segment Duration parameter.)4.3.5. Hot StartHot start can occur in any segment type, for any PSP but is most useful to ramp segments.When run is initiated it allows the program to automatically advance to the correct point in theprofile which corresponds to the operating temperature of the process. Hot start is enabled inconfiguration level and specifies which programmed variable to use when deciding the correctsegment.4.3.6. Power Fail RecoveryIn the event of power fail to the controller, a strategy may be set in configuration level, whichdefines how the controller behaves on restoration of the power. These strategies include:ContinueRamp backResetThe program runs from the last setpoint. This may cause fullpower to be applied to the process for a short period to heat theprocess back to its value prior to the power failureThis will ramp the process value back to its original value at acontrolled rate. This will be the last encountered rate.The process is aborted by resetting the program4-4 User Guide Part No HA026491 Issue 3.0 Apr-02
2604 Controller Programmer Operation4.3.7. Holdback (Guaranteed Soak)Holdback freezes the program if the process value (PV) does not track the setpoint (SP) by anamount that can be set by the user. It may operate in any PSP type.In a Ramp it indicates that the PV is lagging the SP by more than a settable amount and thatthe program is waiting for the process to catch up.In a Dwell it freezes the dwell time if the difference between the SP and PV exceeds settablelimits.In both cases it guarantees the correct soak period for the product.Example: Holdback applied to a ramp up and a dwell.Dwell starts when PVreaches correct valueDwell held if PVfalls beyond limitsDwell extendedby t1+t2SP/PVt1t2PV lags SP.Holdback stops theramp until SP catchesup.Set by a deviation lowalarmPVSP as modified by holdback follows therate at which the process is capableSP as set inthe programTimeFigure 4-2: Effect of Holdback to Produce Guaranteed Soak4.3.8. External Program InputsDigital inputs may have been configured to allow the program to be operated by externalsources.RunHoldResetRun/HoldRun/ResetAdvance SegmentAdvance ProgramHoldback disabledAllows the program to be run from a pushbutton or other eventAllows the program to be held from a switch or other event.Allows the program to be reset from a pushbutton or other event.Allows the program to be run or held from a single external sourceAllows the program to be run or reset from a single external sourceSelects the next segment from an external sourceSelects the next program from an external source. When this eventoccurs, the controller display will change to programmer view.Subsequent changes of this source will cause the program number toincrement.Disables holdback from an external sourceUser Guide. Part No HA026491 Issue 3.0 Apr-02 4-5
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2604 Controller ContentsMODEL 2604
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RESEARCHLETTERaReference beamHOEabO
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2604 Controller Introduction1.2. BE
Page 9 and 10: 2604 Controller Introduction1.3.2.
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Page 17 and 18: 2604 Controller InstallationThe thr
Page 19 and 20: 2604 Controller Installation2.3.2.
Page 25: 2604 Controller InstallationRS485 4
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Page 31 and 32: 2604 Controller InstallationI/O Mod
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Page 35 and 36: 2604 Controller InstallationTransdu
Page 39 and 40: 2604 Controller Operation3. CHAPTER
Page 41 and 42: 2604 Controller Operation3.1. POWER
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Page 55 and 56: 2604 Controller Operation3.12. PARA
Page 57 and 58: 2604 Controller Programmer Operatio
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Page 85 and 86: 2604 Controller Alarm Operation5. C
Page 87 and 88: 2604 Controller Alarm Operation5.2.
Page 99 and 100: 2604 Controller Appendix AA. APPEND
Page 101 and 102: 2604 Controller Appendix AA.2. CONF
Page 103 and 104: 2604 Controller Safety and EMC Info
Page 109 and 110: 2604 Controller Technical Specifica
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2604 Controller Technical Specifica
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MODEL 2604 CONTROLLER - USER GUIDE - d a n m a r k

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