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83
Pre-Tune
Type: Controller Definition
The Pre-Tune facility artificially disturbs the start-up pattern so that a first approximation of the PID
values can be made prior to the setpoint being reached. During Pre-Tune, the controller outputs full
Primary Power until the process value has moved approximately halfway to the setpoint. At that
point, power is removed (or outputs full Secondary Power for Dual Control), thereby introducing an
oscillation. Once the oscillation peak has passed, the Pre-Tune algorithm calculates an
approximation of the optimum PID tuning terms proportional band(s), automatic reset and rate. The
process is shown in the diagram below.
When Pre-Tune is completed, the PID control output power is applied using the calculated values.
Pre-Tune limits the possibility of setpoint overshoot when the controller is new or the application has
been changed. As a single-shot operation, it will automatically disengage once complete, but can be
configured to run at every power up using the Auto Pre-Tune function.
The Pre-Tune feature on Valve Motor Drive controllers always sets the Rate parameter to zero
(OFF) because derivative action is not usually desirable in these applications.
Pre-Tune will not engage if either primary or secondary outputs on a controller are set for On-Off
control, during setpoint ramping or if the process variable is less than 5% of the input span from the
setpoint. Pre-Tune Operation
Figure 38. Pre-Tune Operation
Also refer to
Auto Pre-Tune
,
Automatic Reset
,
Control Type
,
On-Off Control
,
Input Span
,
PID
,
Primary Proportional Band
,
Process Variable
,
Rate
,
Secondary Proportional Band
,
Self-Tune
,
Setpoint
,
Setpoint Ramping
,
Tuning
and
Valve Motor Drive Control
.
Primary Output Power Limit
Type: Controller Parameter
Used to limit the power level of the Primary Output and may be used to protect the process being
controlled. It may be adjusted between 0% and 100%. This parameter is not applicable if the
primary output is set for On-Off control.
Display code is OPhi, default value = 100%
Also refer to
On-Off Control
.
Control Power
Pre
-
Tune
engaged
here
+100% Power (HEAT output)
Initial PV
Process Variable
SP
–
Initial PV
2
Setpoint
-
100% Power (Cool output)
- TABLE OF CONTENTS 3
- How to use this manual 6
- SECTION 1: INTRODUCTION 7
- SECTION 2: INSTALLATION 8
- 2.3 Panel Cut-outs 9
- 2.4 Panel-Mounting 9
- SECTION 3: PLUG-IN OPTIONS 11
- Table 1 12
- DIN Instruments 13
- 4.3 Wire Isolation 16
- 4.4 Use of Shielded Cable 17
- CAUTION: 18
- 4.8 Connections and Wiring 19
- Figure 9. Rear terminals ( 20
- -DIN Instruments) 20
- 4.14 Option Slot 1 23
- 4.15 Option Slot 2 25
- 4.16 Option Slot 3 26
- 4.17 Option Slot A 28
- 4.18 Option Slot B 29
- SECTION 5: POWERING UP 30
- 5.3 Displays 31
- 5.4 Keypad 31
- 5.5 LED Functions 31
- 7.1 Select Mode 33
- 7.2 Automatic Tune Mode 34
- 7.3 Product Information Mode 35
- 7.4 Lock Code View 37
- Changing Parameter Values 39
- 8.2 1400+ – Setup Mode 45
- Navigating in Operator Mode 49
- 8.5 Manual Control Mode 52
- Word Parameters 53
- Table 15 61
- 9.4 Manually Fine Tuning 62
- 10.1 Physical Layer 63
- 10.2 Link Layer 64
- 10.3 Device Addressing 65
- 10.5 Function Descriptions 65
- 01 / 02 HI LO HI LO 66
- 01 / 02 66
- 03 / 04 HI LO HI LO 66
- 03 / 04 HI LO HI LO 66
- Exception Responses 68
- 11.1 Physical Layer 70
- 11.2 Device Addressing 70
- 11.3 Session Layer 70
- Type 1 Message 71
- Type 2 Message 72
- Type 3 Message 72
- 11.4 Error Response 73
- SECTION 12: CALIBRATION MODE 74
- 12.3 Recalibration Procedure 75
- Type: Controller Definition 76
- Alarm Operation 77
- Type: General Definition 84
- Type: Controller Parameter 84
- Figure 37. Overlap/Deadband 87
- 14.1 Universal Input 99
- DC Linear 101
- 14.2 Auxiliary Inputs 102
- 14.3 Digital Inputs 102
- 14.4 Output Specifications 102
- Single Relay: 103
- Dual Relay: 103
- SSR Driver: 103
- 14.7 Digital Communications 105
- 14.5 Control Specifications 105
- 14.6 Process Alarms 105
- 14.8 Reference Conditions 106
- 14.9 Operating Conditions 106
- 14.10 Standards 106
- Manual Language 108
- Packing Options 108
- Special Variants 108
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