Watlow PPC-2000 User Manual

PPC-2000

User’s Guide

WATLOW

1241 Bundy Boulevard Winona, Minnesota USA 55987

Phone: +1 (507) 454-5300, Fax: +1 (507) 452-4507

Part No. 0600-3000-2000 Rev 2.3d

http://www.watlow.com

PPC-2000 Adaptive Control Addendum

Scope

This document describes the additional features and functionality found in the PPC-2010-xxB with adaptive control. Refer to the PPC-2000 User’s Guide regarding all other functionality which is the same as the standard version.

Introduction

The Watlow Anafaze PPC-2000 controller offers these standard options:

• Forty-eight loops of conventional PID control with auto-tuning

capability

-or-

• Eight loops of adaptive control plus 24 loops of conventional PID

control with auto-tuning for a total of 32 loops (the option described in this document)

ANAWIN3 HMI software is available to support either option. A mix of these options is not supported by ANAWIN3.

ANAWIN3 Software Installation

Follow the standard instructions to install and setup ANAWIN3. In the setup program select the Adaptive Control option.

Spreadsheet Overview Screen

Several new parameters and options appear on the Spreadsheet Overview screen in support of the adaptive control option. These parameters and options are applicable only for the first eight channels and are omitted or ignored for channels 9 to 32.

Control Type

An additional option appears for Control Type. Select Adaptive to enable adaptive control and tuning on a channel. This option is only valid for channels 1 to 8.

Values: PID1 (0), PID2 (1), Adaptive (2) and Retransmit (3) Default: PID1 (0) Modbus Address (Channels 1 to 32): 46401 to 46432 Parameter Number: 19 LogicPro Driver: Database LogicPro Address (Channels 1 to 32): 19.1 to 19.32

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Adaptive Mode

When Control Type is set to Adaptive, this parameter can be used to pause tuning or to reset the adaptive algorithm and have it relearn the system. This parameter has no effect on control if the Control Type for the loop is set to an option other than Adaptive.

Values: Adapt (0), Reset (1) and Hold (2) Default: Reset (1) Modbus Address (Channels 1 to 32): 49001 to 49032 Parameter Number: 21 LogicPro Driver: Database LogicPro Address (Channels 1 to 32): 21.1 to 21.32

Table 1. Adaptive Mode Settings

Setting Description

Adapt The normal setting for a loop with Control Type set to

Adaptive. The loop is adapting and tuning while controlling.

Reset Select this option to have the control loop start from scratch

and relearn the load characteristics. The Control Mode must be set to Off or Manual to select this option for an adaptive loop. This is the normal setting for a loop with Control Type set to a value other than Adaptive.

Hold Select this option to have the control loop stop learning

temporarily but retain the learned load characteristics. For example in the event that maintenance will be performed, it may be advantageous to pause adapting to avoid false data being introduced. Select this option anytime you want the controller to stop adapting and continue to control with the parameters learned up to that point.

Plant Delay

This parameter indicates the amount of delay in seconds in the load. This characteristic of the load or plant has a significant impact on adaptive control. A larger number indicates a longer delay between, for example an increase in heater power and an increase in the temperature.

Choose Automatic and then set the Control Mode to Auto to have the adaptive algorithm determine the plant delay for the loop. The loop must be at least 40 degrees below set point and the controller must observe a temperature change of at least 20 degrees to determine the Plant Delay. If you have determined the Plant Delay with the PPC-2000's adaptive control previously and found the performance acceptable, you may choose the delay directly and the loop will use the value you choose rather than measure it.

This setting is not reset by the Adaptive Mode parameter's Reset option. To have the controller relearn the Plant Delay, set the loop's Control Mode to Manual or Off, set the Plant Delay to Automatic, and then set the Control Mode to Auto again.

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Tuning Gain

This parameter has no effect on control if the Control Type for the loop is set to an option other than Adaptive.

Values: Automatic (0) and 1 (1) to 600 seconds (600) Default: Automatic (0) Modbus Address (Channels 1 to 32): 49051 to 49082 Parameter Number: 28 LogicPro Driver: Database LogicPro Address (Channels 1 to 32): 28.1 to 28.32

Default: Nominal (1) Modbus Address (Channels 1 to 32): 46551 to 46682 Parameter Number: 29 LogicPro Driver: Database LogicPro Address (Channels 1 to 32): 29.1 to 29.32

Figure 1. The Effect of Tuning Gain on Recovery from a Load Change

Using Adaptive Control

To set up adaptive control on one or more channels:

1. Open the

2. On the a. Choose the appropriate b. Choose c. For any linear voltage, current, or pulse sensors, set the linear

3. On the

Adaptive Addendum PPC-2000 User's Guide 0600-0049-0001 rev C Watlow Anafaze 3

Spreadsheet Overview screen in ANAWIN3.

Inputs spreadsheet for each analog input you have wired:

Input Type for the sensor.

Units.

scaling parameters ( and

PV Hi). See Setting up User Selectable Linear Inputs on

page 98 of the PPC-2000 User's Guide.

Channels spreadsheet for each channel:

Input Signal Lo, Input Signal Hi, PV Lo,

a. In the PV Source field, choose the input that you want to

monitor or use as feedback for closed-loop control.

b. In the

Heat Output Dest and/or Cool Output Dest fields,

choose the outputs that you want to use for closed-loop control.

c. Choose a d. Set the

Output Type

4. On the a. Set the

Output.

5. On the

Heat/Cool Output Type for each output.

Heat/Cool Cycle Time for any outputs with Heat/ Cool

set to Time Prop.

Digital I/O spreadsheet:

Direction for each I/O point to be used for control to

Channels spreadsheet:

a. For channels other than the adaptive ones, if both heat and cool

outputs are used, set the

Spread.

b. For each channel that will perform adaptive control, for the

Control Type, choose Adaptive.

c. Set the

Set Point to the desired value at least 40 engineering

units (typically degrees) above the process variable.

d. Set the

Control Mode to Auto to begin adaptive closed-loop

control.

NOTE: Only channels 1 to 8 can be selected for adaptive control.

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PPC-2000 User's Guide Addendum

Overview

This document contains additional specifications for the PPC-2000 system.

Environmental Specifications

Table 1 here contains specifications in addition to those found in tables 7.4, 7.15, 7.23,

7.31, 7.39, 7.46, 7.52, 7.57, 7.62, 7.67 in the PPC-2000 User's Guide.

TABLE 1. Environmental Specifications

Altitude 2000 meters max Non-Condensing Humidity 10 to 95% Relative Humidity 80% max (ambient temperature <= 31° C)

50% max (ambient temperature = 40° C)

Pollution Category Degree 2 (per IEC 664) Operating Temperature Range 0 to 60° C (32 to140° F) Storage Temperature Range -20 to 70° C (-4 to 158° F)

PPC IPS International Power Supply Specifications Table 2 here contains specifications in addition to those found in table 7.75 in the PPC2000 User's Guide.

TABLE 2. Power Specifications

Input (Mains Supply) 88 to 132 Vac (120 Vac nominal)

176 to 264 Vac (240 Vac nominal)

Voltage Fluctuation < +10% of nominal voltage

Transient Over-Voltage Category II per IEC 664

Output V1: +5 Vdc @ 6 A

V2: +24 Vdc @ 4 A

Input Frequency 47 to 440 Hz Peak Current Output 9A @ 5Vdc

6A @ 24 Vdc

1241 Bundy Blvd. Winona, MN 55987 Phone: (507) 494-5656 Fax: (507) 452-4507

Information in this manual is subject to change without notice. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form without written permission from Watlow Anafaze.

Warranty

Watlow Anafaze, Incorporated warrants that the products furnished under this Agreement will be free from defects in material and workmanship for a period of three years from the date of shipment. The Customer shall provide notice of any defect to Watlow Anafaze, Incorporated within one week after the Customer's discovery of such defect. The sole obligation and liability of Watlow Anafaze, Incorporated under this warranty shall be to repair or replace, at its option and without cost to the Customer, the defective product or part.

Upon request by Watlow Anafaze, Incorporated, the product or part claimed to be defective shall immediately be returned at the Customer's expense to Watlow Anafaze, Incorporated. Replaced or repaired products or parts will be shipped to the Customer at the expense of Watlow Anafaze, Incorporated.

There shall be no warranty or liability for any products or parts that have been subject to misuse, accident, negligence, failure of electric power or modiﬁcation by the Customer without the written approval of Watlow Anafaze, Incorporated. Final determination of warranty eligibility shall be made by Watlow Anafaze, Incorporated. If a warranty claim is considered invalid for any reason, the Customer will be charged for services performed and expenses incurred by Watlow Anafaze, Incorporated in handling and shipping the returned unit.

If replacement parts are supplied or repairs made during the original warranty period, the warranty period for the replacement or repaired part shall terminate with the termination of the warranty period of the original product or part.

The foregoing warranty constitutes the sole liability of Watlow Anafaze, Incorporated and the Customer's sole remedy with respect to the products. It is in lieu of all other warranties, liabilities, and remedies. Except as thus provided, Watlow Anafaze, Inc. disclaims all warranties, express or implied, including any warranty of merchantability or ﬁtness for a particular purpose.

Please Note

: External safety devices must be used with this equipment.

Table of Contents iii

List of Figures ix

List of Tables xv

Overview 1

Manual Contents 1 Getting Started 2

Safety symbols 2 Contacting Watlow Anafaze 2 Initial Inspection 2

Product Features 3 System Components 3

PPC-2000 Modules 6 PPC-2000 Terminal Boards 8 Additional Components 9

Safety 9

External Safety Devices 10 External Switch Disconnect 11 Battery Safety 11 Product Markings and Symbols 11

Hardware Installation 13

Power Supply Requirements 13

Mounting the Power Supply 15

Hardware Configuration 17

Module Addresses 17 PPC-2010 Jumper Settings 18 PPC-2030 Dip Switch Settings 19 PPC-2030 Jumper Settings 20 PPC-2040 Jumper Settings 21 PPC-205x Jumper Settings 22

Module Disassembly 26 Mounting Modules 26

DIN Rail Mounting 27

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Table of Contents PPC-2000 User’s Guide

Mounting Terminal Boards 28

DIN Rail Mounting 31 DIN Rail Removal 32 Panel Mounting 33

System Wiring 34

Wiring Recommendations 35 Noise Suppression 35 Avoiding Ground Loops 37

Connecting I/O to the PPC-2010 37

Connecting the TB50 to the PPC-2010 Module 37 TB50 Connections 38 Connecting Digital Inputs 40 Connecting Counter or Frequency Inputs 41 Connecting Digital Outputs 41 SDAC Connections 43

Connecting Analog Inputs to the PPC-2021 — 2025 45

Connecting the AITB to the PPC-202x 45 Sensor Keys 46 AITB Connections 47 Connecting Thermocouples 49 Connecting RTDs 50 Connecting Sensors with Linear Voltage Signals 52 Connecting Sensors with Linear Current Signals 53 Connecting the Encoder Input Cable to the PPC-2030 55 Encoder Wiring 57 Encoder Connections without the EITB 59 Analog Output Connections 60

Connecting I/O to the PPC-2040 61

Connecting the TB50 to the PPC-2040 Module 61 TB50 Connections 62 Connecting Digital Inputs 64 Connecting Counter or Frequency Inputs 64 Connecting Digital Outputs 65

Connecting to the Relay Outputs on the PPC-206x 70

Wiring PPC-2062 Relay Outputs 71 Using Snubbers for Relay Outputs 73

Connecting Power 77

PPC-IPS-2 Power Supply 77 Processor Module 77

Connecting Communication Ports 78

Communication Ports 78 Connecting RS-485 Communications 81

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PPC-2000 User’s Guide Table of Contents

Operating with AnaWin3 89

Type Definitions 89 Closed-Loop Control 89

Feedback 90 Control Algorithm 90 Control Output Signal Forms 90 Heat and Cool Outputs 90 Prerequisites 93 Background 93 Using AnaWin3 to Tune 94

Alarms 95

Failed Sensor Alarms 95 Global Alarm 95 Process Alarms 95 Alarm Delay 96 Setting up Process and Deviation Alarms 97 Setting Input Signal Lo and Input Signal Hi 99 Setting Engineering Units 99 Setting PV Lo and PV Hi 99 Setting Decimal Places 100 Linear 4-20mA Input Example 101

Process Variable Retransmit 102

Setting up Process Variable Retransmit 103 Process Variable Retransmit Example 104

Cascade Control 105

Setting up Cascade Control 106 Cascade Control Example 106

Ratio Control 109

Setting up Ratio Control 110

Differential Control 112 Remote Set Point 112 Logic Programs 112

Setting up Outputs for Use with a Logic Program 113 Using Logic to Set an Analog Input 113 Starting and Stopping Logic Programs 113

Controller Parameters 115

Channels 115 Digital I/O 132 Soft Integer 136 Soft Boolean 137

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Table of Contents PPC-2000 User’s Guide

Troubleshooting 141

General Description 141 PPC-2010 Processor 141

Processor Module LEDs 147

PPC-2040 Digital I/O 151 PPC-207x Digital In 153 Troubleshooting and Corrective Actions 154

Digital Inputs and Outputs 154 Process Variable 154 Communications 155 Resetting Closed-Loop Control Parameters 156 Disabling Control 157

LogicPro and Modbus Reference 159

Overview 159

Text Conventions in the Database Sections 159 The PPC-2000 Database 160 Data Table Organization 161 How LogicPro Accesses the Database 162

Analog and Counter Input Parameters in the Database 163

Accessing Analog and Counter Input Parameters with Modbus 163 Accessing Analog and Counter Input Parameters with LogicPro 163 Analog Input Numbers and Address Offsets 164 Analog and Encoder Input Parameters 168

Channel Parameters in the Database 172

Accessing Channel Parameters with Modbus 172 Accessing Channel Parameters with LogicPro 173 Channel Parameters for Heat and Cool Outputs 173 Channel Parameters 173 State and Logic 195 Accessing Digital I/O Parameters with Modbus 195 Digital I/O Numbers and Address Offsets 196 Digital I/O Parameters 200 Accessing Analog Outputs with Modbus 202 Accessing Analog Outputs with LogicPro 202 Analog Outputs and Modbus Addresses 202 Analog Output Value 204

Soft Bool and Soft Int Registers in the Database 205

Accessing Soft Bool and Soft Int Registers with Modbus 205 Accessing Soft Bool and Soft Int Registers with LogicPro 205 Soft Bool and Soft Int Registers 205

Global Parameters in the Database 206

Accessing Global Parameters with Modbus 206 Communications Parameters 207 Global Database Parameters 209

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PPC-2000 User’s Guide Table of Contents

Tuning and Control 219

Introduction 219 Control Algorithms 220

On/Off Control 220 Output Control Forms 224 Output Filter 225 Proportional Band (PB) Settings 226 Integral Settings 226 Derivative Settings 227

General PID Constants by Application 228

Proportional Band Only (P) 228 Proportional with Integral (PI) 228 PI with Derivative (PID) 228

Specifications 229

System Specifications 229

Safety and Agency Approvals 229 Physical Specifications 230 Power Specifications 230

PPC-2010 Processor Specifications 231 PPC-205x Analog Out Specifications 247 PPC-206x Digital Output Specifications 250 PPC-207x Digital In Specifications 253 PPC-EITB-1 Encoder Input Terminal Block Specifications 258 PPC-TB50-SCSI, 50-Pin Specifications 261 SDAC Specifications 265

Inputs 266 Analog Outputs 267

Appendix A: Modbus Protocol 269

Query 270 Response 270 Message Framing 271

Address Field 272 Function Field 272 Data Field 273 Error Checking Field 273 Field Format 273 Parity Checking 274 CRC Checking 275 Read Examples 280

Appendix B: Declaration of Conformity 283

Glossary 285

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Table of Contents PPC-2000 User’s Guide

viii Watlow Anafaze Doc.# 30002-00 Rev 2.3

Overview 1

Figure 1.1—System Diagram 4 Figure 1.2—Sample PPC-2000 System 6

Hardware Installation 13

Figure 2.1—PPC-IPS-2 DIN Mounting Dimensions 15 Figure 2.2—PPC-IPS-2 Panel Mounting Dimensions 16 Figure 2.3—Sample Addresses 17 Figure 2.4—PPC-2010 Jumpers 19 Figure 2.5—PPC-2030 Jumpers and Switches 20 Figure 2.6—PPC-2040 Jumper Settings 21 Figure 2.7—PPC-205x Jumpers 23 Figure 2.8—Assembled Modules Top View 24 Figure 2.9—Assembled Modules Bottom View 25 Figure 2.10—Modules Bottom/Side View 25 Figure 2.11—DIN Rail Latches 27 Figure 2.12—Mounting Assembled PPC Modules on a DIN rail (side) 27 Figure 2.13—AITB Dimensions / Clearances 29 Figure 2.14—EITB Dimensions / Clearances 30 Figure 2.15—TB50 Dimensions / Clearances 31 Figure 2.16—TB50 Mounted on DIN Rail (Front) 32 Figure 2.17—TB50 Mounted on DIN Rail (Side) 32 Figure 2.18—TB50 Panel Mounted 33 Figure 2.19—SDAC Dimensions 34 Figure 2.20—PPC-2010 Connection to TB50 38 Figure 2.21—Wiring Digital Inputs 41 Figure 2.22—Encoder with 5Vdc TTL Signal 41 Figure 2.23—Powering Output with 5Vdc from PPC Supply 42 Figure 2.24—Powering Output with 12-24Vdc from PPC supply 42 Figure 2.25—Powering Output with Separate Power Supplies 42 Figure 2.26—Recommended circuitry for CPUWatchdog 43 Figure 2.27—Wiring Single/Multiple SDACs 44 Figure 2.28—PPC-2021 — 2025 Connection to AITB 45 Figure 2.29—Inserting Sensor Keys in AITB 46 Figure 2.30—An Input Key 47 Figure 2.31—Thermocouples Connected to Differential Inputs 1 and 2 49 Figure 2.32—Thermocouples Connected to Single-ended Inputs 1 and 2 50 Figure 2.33—Wiring 2-Wire RTDs: Input 1 and 2 Shown 51 Figure 2.34—Wiring 3-Wire RTDs: Input 1 and 2 Shown 51

List of Figures

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List of Figures PPC User’s Guide

Figure 2.35—Connecting Linear Voltage Signals to Differential Inputs 1 and 2 52 Figure 2.36—Connecting Linear Voltage Signals to Single-ended Inputs 1 and 2 53 Figure 2.37—Connecting Current Inputs to a Differential Input Module:

Input 1, 2, and 3 Shown 53

Figure 2.38—Connecting Current Inputs to a Single-ended Analog Input

Module: Input 1 and 2 Shown 54 Figure 2.39—PPC-2030 Connections (Bottom View) 55 Figure 2.40—PPC-EITB-1 56 Figure 2.41—EITB Single-ended Single Phase Connections: Input 1 and 2 Shown 57 Figure 2.42—EITB Single-ended Quadrature Connections: Input 1 and 2 Shown 58 Figure 2.43—EITB Differential Single Phase Connections: Input 1 and 2 Shown 58 Figure 2.44—EITB Differential Quadrature Connections: Input 1 and 2 Shown 59 Figure 2.45—PPC-2030 Analog Out Terminal Block 60 Figure 2.46—Analog Output Connections on a PPC-2030: Outputs 1 and 2 Shown 61 Figure 2.47—PPC-2040 Connection to TB50 62 Figure 2.48—Wiring Digital Inputs 64 Figure 2.49—Single Phase Connections: Input 1 and 2 Shown 64 Figure 2.50—Quadrature Connections: Inputs 1 and 2 Shown. 65 Figure 2.51—Powering Output with 5Vdc from PPC Supply 65 Figure 2.52—Powering Output with 12-24Vdc from PPC supply 66 Figure 2.53—Powering Output with Separate Power Supplies 66 Figure 2.54—PPC-205x Connections (Bottom View) 67 Figure 2.55—Analog Output Connections on a PPC-2050 Configured for Current:

Outputs 1 and 2 Shown 68 Figure 2.56—Analog Output Connections on a PPC-2050 Configured for Voltage:

Outputs 1 and 2 shown 69 Figure 2.57—Analog Output Connections on a PPC-2051 Configured for Current and

Voltage: Outputs 1 and 2 shown 69 Figure 2.58—PPC-206x Connections (bottom view) 70 Figure 2.59—Relay Output Connections on a PPC-2061:

Outputs 1, 2, 9 and 10 shown 71 Figure 2.60—Relay Output Connections on a PPC-2062: Outputs 1 and 2 Shown 72 Figure 2.61—Snubber Connections 73 Figure 2.62—PPC-207x Connections (bottom view) 74 Figure 2.63—Input Connections to a PPC-2070 or PPC-2072:

Inputs 1 and 2 shown 74 Figure 2.64—Input Connections to a PPC-2071 or PPC-2073:

Inputs 1,2, 9 and 10 Shown 75 Figure 2.65—Connecting a Current Sinking Field Device to a PPC-2072 or PPC-2073:

Input 1 Shown 75 Figure 2.66—Connecting a Current Sourcing Field Device to a PPC-2072 or

PPC-2073: Input 1 Shown 76 Figure 2.67—PPC-IPS-2 Power Connections 78 Figure 2.68—RS-232 and RS-485 RJ-Type Connectors 79 Figure 2.69—Connecting One PPC to a Computer Using RS-232 81 Figure 2.70—Connecting Multiple PPCs to a Computer Using RS-485 81 Figure 2.71—RS-485 Wiring 82 Figure 2.72—Two Wire RS-485 Wiring 84 Figure 2.73—Connecting Several PPCs with Short Cable Runs 84

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PPC User’s Guide List of Figures

Operating with AnaWin3 89

Figure 3.1—Sample Screen Text 89 Figure 3.2—Process Variable Alarms 96 Figure 3.3—Linear Input Example 98 Figure 3.4—Linear Scaling of the Analog Input for Retransmit on the Heat or Cool

Output 102 Figure 3.5—Sample Application Using Process Variable Retransmit 104 Figure 3.6—How the Secondary Channel’s Set Point is Determined When the

Primary Channel Has Heat and Cool Outputs 105 Figure 3.7—How the Secondary Channel’s Set Point is Determined When the Primary

Channel Has Only a Heat Output 106 Figure 3.8—Sample Application Using Cascade Control 107 Figure 3.9—The Secondary Channel’s Set Point is Determined by the Primary

Channel’s Process Variable 109 Figure 3.10—Relationship between the Master Channel’s Process Variable and the

Ratio Channel’s Set Point. 110 Figure 3.11—Sample Application Using Ratio Control 111 Figure 3.12—Channels Spreadsheet 115 Figure 3.13—Output Scaling (Heat/Cool) Curves 121 Figure 3.14—Alarms Spreadsheet 123 Figure 3.15—Inputs Spreadsheet 127 Figure 3.16—Analog Input Names 127 Figure 3.17—Pulse Input Names 128 Figure 3.18—Soft Input Names 128 Figure 3.19—Channel Output Names 129 Figure 3.20—Dig I/O Spreadsheet 132 Figure 3.21—PPC-2010 and PPC-204X Digital I/O Names 133 Figure 3.22—PPC-206X and PPC-207X Digital I/O Names 133 Figure 3.23—Outputs Spreadsheet 135 Figure 3.24—Analog Output Names 135 Figure 3.25—Soft Int Spreadsheet 136 Figure 3.26—Soft BOOL Spreadsheet 137 Figure 3.27—PPC Globals Screen 138

Troubleshooting 141

Figure 4.1—Assembled Modules Top View 143 Figure 4.2—Assembled Modules Bottom View 143 Figure 4.3—PPC-2010 Internal View 144 Figure 4.4—PPC Assembled Modules Top View 145 Figure 4.5—PPC Assembled Modules Bottom View 146

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List of Figures PPC User’s Guide

LogicPro and Modbus Reference 159

Figure 5.1—Sample Text 160 Figure 5.2—Output Scaling Curves 185

Tuning and Control 219

Figure 6.1—On/Off Control 220 Figure 6.2—Proportional Control 221 Figure 6.3—Proportional and Integral Control 222 Figure 6.4—Proportional, Integral and Derivative Control 223 Figure 6.5—Example Time Proportioning and Distributed Zero Crossing

Waveforms 224

Specifications 229

Figure 7.1—System Footprint 230 Figure 7.2—PPC-2010 Front View 231 Figure 7.3—PPC-2010 Bottom View 232 Figure 7.4—PPC-2021 Front View 236 Figure 7.5—PPC-2021 - 2025 Bottom View 236 Figure 7.6—PPC-2030 Front View 240 Figure 7.7—PPC-2030 Bottom View 241 Figure 7.8—PPC-2040 Front View 244 Figure 7.9—PPC-2050 Front View 247 Figure 7.10—PPC-2050 Bottom View 248 Figure 7.11—PPC-206x Front View 250 Figure 7.12—PPC-206x Bottom View 251 Figure 7.13—PPC-2070, PPC-2071 Front Views 253 Figure 7.14—PPC-207x Bottom Views 254 Figure 7.15—PPC-AITB-1 256 Figure 7.16—PPC-AITB Dimensions with Straight SCSI Cable 257 Figure 7.17—PPC-EITB-1 258 Figure 7.18—PPC-EITB Dimensions with HD-Type Cable 260 Figure 7.19—PPC-TB50-SCSI Dimensions 261 Figure 7.20—PPC-TB50-SCSI Dimensions with Straight SCSI Cable 262 Figure 7.21—PPC-TB50-SCSI Dimensions with Right-Angle SCSI Cable 263 Figure 7.22—PPC-IPS-2 264 Figure 7.23—SDAC Dimensions 266