United Security Products AVD-45c Manual Pagina 224
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210 UDC 6300 Process Controller Product Manual 1/03
5.22 Three Position Step Control
Introduction
The Three Position Step Control algorithm allows the control of a valve
(or other actuator) with an electric motor. Digital Outputs 3 and 4
generate control signals that drive external relays; one to move the motor
upscale, the other to move it downscale, without a feedback slidewire
linked to the motor shaft. Adaptive Tune does not function with this
algorithm.
How it works
Three Position Step control is an extension of the On-Off Duplex Control
to include internal feedback of the state of the Digital Outputs.
In this algorithm, the error signal is compared with a feedback signal and
the result determines the state of the Digital Outputs as follows:
Positive Error > Feedback Digital Output 3 On
Negative Error < Feedback Digital Output 4 On
Otherwise, the outputs are both off.
Estimated motor
position
The Three Position Step control algorithm provides an output display
(“OUT”) which is an estimated motor position since the motor is not using
any slidewire feedback.
Although this output indication is only accurate to a few percent, it is
corrected each time the controller drives the motor to one of its stops
(0% or 100%).
It avoids all the control problems associated with the feedback slidewire
(wear, dirt, noise).
When operating in this algorithm, the estimated “OUT” display is shown
to the nearest percent (i.e. no decimal).
Setting the motor
travel time
Table 5-44 lists the procedure for setting the motor time. This is the time
it takes the motor to travel from 0% to 100%.
Table 5-44 Procedure for Setting the 3PSTEP Motor time
Step Operation Press Action
1
Enter the Set
Up mode
SET
UP
Until you see:
Upper Display
Lower Display
SET UP
ALGORTHM
2
Select 3PSTEP
FUNC
L1/L2
Until you see:
Upper Display
Lower Display
CONTR ALG
Current Selection
or
To select “3PSTEP” in the upper display
Continued on next page
- UDC 6300 1
- Process Controller 1
- Product Manual 1
- About This Publication 3
- Table of Contents 5
- Table of Contents, continued 5
- Figures 8
- Tables 9
- Tables, continued 10
- Acronyms 12
- References 13
- Section 1 – Overview 15
- 1.1 Introduction 15
- 1.1 Introduction, Continued 16
- 1.2 Operator Interface 18
- Table 1-1 Function of Keys 19
- Section 2 – Installation 21
- 2.1 Overview 21
- 2.1 Overview, Continued 22
- Model number 23
- 24Vac/dc 115 Vac 230 Vac 25
- POWER SELECT JUMPER PLACEMENT 25
- 2.4 Mounting 27
- 2.4 Mounting, Continued 28
- 2.5 Wiring 29
- 2.5 Wiring, Continued 30
- 2.6 Wiring Diagrams 31
- Line voltage wiring 32
- High level input 33
- Optional Input 5 34
- (Low Level Inputs) 34
- Current Output 36
- 2nd Current Output 4–20mA 37
- Section 3 – Configuration 41
- 3.1 Overview 41
- 3.2 Configuration Prompts 42
- CYC4SEC PVEU VALx GAIN VALx 43
- 3.3 How To Get Started 44
- 3.4 Configuration Tips 45
- 3.5 Configuration Procedure 46
- Set this group last 48
- Duplex Heat Cool 48
- Loop) 52
- 3.9 Accutune Set Up Group 54
- 3.17 Options Set Up Group 72
- 3.18 Communications Group 74
- 3.19 Alarms Set Up Group 76
- (Process Variable) 77
- (Communications) 77
- 3.21 Calib Group 80
- 3.22 Status Group 80
- Keep a record 81
- 4.1 Overview 85
- 4.5 Accutune Set Up Group 93
- ATTENTION 100
- PV (or RSP) = K x 102
- (A - B) 104
- (Calc Hi - Calc Lo)) 104
- PV or SP = K 104
- Continued 109
- Continued on next page 109
- LT A or B GT A 115
- These prompts appear only 117
- 4.13 Options Set Up Group 134
- Introduction 142
- Communications group 142
- 4.15 Alarms Set Up Group 147
- 4.17 Calibration Data 155
- 4.18 Status Test Data 155
- Section 5 – Operation 157
- 5.1 Overview 157
- Lower Display 159
- Upper Displa 159
- 5.3 Enter a Security Code 160
- Operator Interface 161
- Decimal point 161
- Annunciators 162
- Bargraphs 163
- Setpoint Bargraph 163
- Σ (Sigma) 165
- 5.5 Start Up Procedure 167
- 5.6 Operating Modes 168
- Upper Display 170
- continued 171
- CONTROL2 172
- 5.7 Setpoints, Continued 175
- 5.8 Setpoint Rate 179
- 5.9 Single Setpoint Ramp 180
- Available selections 183
- The switchover 184
- The PV value 185
- X= 1 or 2 185
- Single Loop 187
- Controller 187
- Loop 2 188
- Internal Cascade 189
- Override rules 190
- Table 5-25 191
- Parameters 193
- Internal cascade 196
- 5.15 Input Math Algorithms 198
- Totalizer function 200
- 5.16 Logic Gate Operation 201
- 5.17 Digital Outputs 203
- How it works 212
- Configuration 212
- 5.20 Accutune™ 213
- 5.20 Accutune™, Continued 214
- 5.21 Input 5 - Pulse Input 222
- OUT and the estimated 3PStep 225
- 5.23 Auto/Manual Station 226
- Description 227
- Input 1 Span 228
- Input 2 Span 228
- Operation 229
- 6.1 Overview 231
- (IEC=0.00385) 232
- Disconnect the field 233
- 1 to 5 Volts or 4–20 235
- X = 1, 2, 3, or 4 236
- INX SPAN 237
- Junction 240
- Resistor 240
- Precision 241
- RTD Inputs 242
- Radiamatic, Millivolts 243
- Volts, or milliamps 243
- Equipment needed 246
- Range Specifications 246
- IN5 SPAN 248
- 7.1 Overview 255
- 7.3 2nd Current Output 259
- CUR OUT2 261
- WARNING—SHOCK HAZARD 263
- 8.1 Overview, Continued 264
- 8.2 Troubleshooting Aids 265
- Software 266
- FAILSAFE 267
- 8.4 Status Tests 268
- Table 8-5 Status Tests 269
- (Lower Display) 270
- 8.5 Background Tests 271
- Output(s) failure 276
- Failure 276
- (Key Name) 278
- Rear of case 281
- Parts Identification 282
- (Part Number 30757007-501) 283
- (Part Number 30757071-501) 283
- Part Number 30757010-501) 283
- 8.9 Maintenance 291
- Section 9 – Parts List 293
- 9.1 Exploded View 293
- (opening must be widened) 295
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