Emerson Liebert iCOM Manuale utente

Large Systems

iCOM Microprocessor

Environmental Training and Service Manual

TM-10098: Rev. 05/27/08

iCOM

Control Training and Service Manual

iCOM

Training & Service

Manual

iCOM

Controls Training and Service Manual

Disclaimer of Warranties and Limitations of

Liabilities

The authors and editors have taken every precaution to ensure accuracy and

completeness in this manual. The authors and editors make no expressed or

implied warranty of any kind with regard to the documentation in this manual.

Liebert Corporation assumes no responsibility, and disclaims all liability for

incidental or consequential damages resulting from the use of this information or

from errors or omissions. Liebert Corporation may make improvements and/or

changes in the product(s) described in this manual at any time. Information in this

manual is subject to change at any time and does not represent a commitment on

the part of Liebert Corporation.

Liebert® and the Liebert logo are registered trademarks of Liebert Corporation.

Emerson® and the Emerson logo are registered trademarks of Emerson Electric

Co.

Specifications subject to change without notice.

Printed in the United States of America

iCOM

Control Training and Service Manual

Table of Contents

Cha

ter 1: Tem

erature/Humidit

Control 6

Temperature Control Types 6

Proportional Control 6

Proportional + Integral (PI) Control 7

Proportional + Integral + Derivative (PID) Control 7

Intelligent Control 8

Temperature Control Operations and Charts 8

2 Stage Compressorized 8

4 Stage Compressorized Cooling 11

Optional Dual Compressor Digital Scroll Operation 15

Optional Glycool (Econ-O-Cycle) Cooling 17

Optional Dual Source Cooling 20

Optional Staged Electric Reheat 21

Humidity Control 24

Absolute (Predictive) Humidity Control 24

Relative Humidity Control 26

Humidifier Control Operations and Charts 26

Autoflush Control for Infrared Humidifier 28

Dehumidification Operation 30

1 Stage Dehumidification, Compressorized Operation 30

2 Stage Dehumidification, Compressorized Operation 31

Reheat During Dehumidification 34

Additional Programs 35

Next Maintenance Calculation 46

Shared Parameters 48

Networking and Functions 49

Teamwork 57

Unit Lead/Lag or Running/Standby Functions 58

iCOM

Controls Training and Service Manual

Cha

ter 2: Pro

rammin

Functions 62

Programming Functions 62

iCOM Display Components and Functions 63

iCOM Keypad Layout Descriptions 64

iCOM Display Symbols / Icons 65

Programming Functions 66

Status Display Screens 67

Menu Screens and Symbols 69

User Menu Icons and Descriptions 70

Service Menu Icons and Descriptions 71

Advanced Menu Icons and Descriptions 72

Navigating and Accessing Sub Menus 72

Where and When to Save 73

User Menu Parameters 75

Service Menu Parameters 82

Advanced Menu Parameters 112

Cha

ter 3:

Hardware Connections 131

Introduction 131

Display Assemblies 132

Unit Control Board DIP Switches and Jumpers 133

Small Display DIP Switches 135

Large Display DIP Switches and Jumpers 136

Temperature/Humidity Board DIP Switches and Jumpers 137

Unit Control Board Plug Connectors 138

Fuse Board Connectors 143

Temperature/Humidity Board Connectors 144

iCOM

Control Training and Service Manual

Cha

ter 4: General Troubleshootin

Data 146

Introduction 146

Isolation 147

Basic Operation of the Triac 148

Basic Operation of the Opto-Isolator 150

Troubleshooting the Opto-Isolator 151

Unit Control Board: Opto-Isolator/Triac Legends 153

Control Input Check (Aquastat Sensor) 155

iCOM Diagnostics/Service Mode Programs 156

Troubleshooting Checklist 157

Basic Troubleshooting Steps 158

Moisture Content Charts 160

Suction Transducer Information 177

Digital Scroll High Temperature Sensor Chart 178

Unit Code Configuration and Code Definitions 179

Glossar

of Terms 189

Com

uter and Network Terms 193

Network Information 198

How To Use The Schematic 200

Electrical Schematic List 201

iCOM

Controls Training and Service Manual

Chapter 1

Temperature and Humidity Control Programs

This section provides details on how your Liebert iCOM control responds to the

user programmed inputs values and room conditions. Refer to this section when

you need specific information on the controls operation. This section provides

details on the four (4) user selectable temperature control programs and the three

(3) user selectable humidity control programs.

Cooling and/or Heating Required, in Percent (%)

The temperature control programs for the iCOM microprocessor are based on a

calculated percent (%) requirement for cooling and/ or heating. This percent (%)

requirement is determined by the control type (algorithm) selected by the user.

The four (4) user selectable temperature control programs are:

•Proportional (P)

•Proportional + Integral (PI)

•Proportional + Integral + Derivate (PID)

•Intelligent

Temperature Control Types

Proportional (P) Control

The proportional control is the standard control method that maintains the room at

a temperature proportional to the load. The temperature maintained increases as

the room load increases. At full load the room would be controlled at a

temperature equal to the temperature set point (TSP) plus ½ of the temperature

proportional band (PB). The operator programmed inputs are the temperature set

point (TSP) and temperature proportional band (PB) adjustments. The operator

may also program a temperature dead band (DB) adjustment which will provide an

offset when the cooling or heating is activated or deactivated.

iCOM

Control Training and Service Manual

Proportional + Integral (PI) Control

The PI control combines two (2) individual terms to determine the control output

for a given set of conditions.

The proportional (P) term is determined by the difference between the current

temperature and the control set point. This term is expressed in % cooling

(heating) desired for each degree above (below) the set point. It is adjustable from

0% to 100% per degree. The purpose of this term is to adjust the control output

for any deviation between the current temperature and the control set point.

The integral (I) term is determined by two things: the difference between the return

air temperature and control set point and the amount of time this difference has

existed. This term is expressed in % cooling (heating) desired for each minute

and degree above (below) the set point. It is adjustable from 0% - 100% per

degree/minute. The purpose of this term is to force the control to maintain the

temperature around the set point by slowly but continuously adding (subtracting) a

small amount of cooling (heating) to the total control output until the temperature is

at the set point.

Proportional + Integral + Derivate (PID) Control

The PID control combines three individual terms to determine the control output for

a given set of conditions. Note that PID control is used only for temperature. If

PID control is selected, humidity will continue to use proportional control.

The proportional (P) term is determined by the difference between the current

temperature and the control set point. This term is expressed in % cooling

(heating desired for each degree above (below) the set point. It is adjustable from