Honeywell UDC2500 User Manual

UDC2500

Universal Digital Controller

Product Manual

51-52-25-127 April 2007

Honeywell Process Solutions

Industrial Measurement and Control

Notices and Trademarks

Copyright 2007 by Honeywell

Revision 5 April 2007

WARRANTY/REMEDY

Honeywell warrants goods of its manufacture as being free of defective materials and faulty workmanship. Contact your local sales office for warranty information. If warranted goods are returned to Honeywell during the period of coverage, Honeywell will repair or replace without charge those items it finds defective. The foregoing is Buyer's sole remedy and is in lieu of all other warranties, expressed or implied, including those of merchantability and fitness for a particular purpose. Specifications may change without notice. The information we supply is believed to be accurate and reliable as of this printing. However, we assume no responsibility for its use.

While we provide application assistance personally, through our literature and the Honeywell web site, it is up to the customer to determine the suitability of the product in the application.

Honeywell Process Solutions

Industrial Measurement and Control

512 Virginia Drive

Fort Washington, PA 19034

UDC2500 is a U.S. registered trademark of Honeywell

Other brand or product names are trademarks of their respective owners.

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About This Document

Abstract

This document provides descriptions and procedures for the Installation, Configuration, Operation, and Troubleshooting of your UDC2500 Controller.

Contacts

World Wide Web

The following lists Honeywell’s World Wide Web sites that will be of interest to our customers.

Honeywell Organization	WWW Address (URL)
Corporate	http://www.honeywell.com
Industrial Measurement and Control	http://www.honeywell.com/ps
Technical tips	http://content.honeywell.com/ipc/faq

Telephone

Contact us by telephone at the numbers listed below.

	Organization	Phone Number
United States and Canada	Honeywell	1-800-423-9883	Tech. Support
		1-800-525-7439	Service

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Introduction

Symbol Definitions

The following table lists those symbols used in this document to denote certain conditions.

Symbol	Definition

This CAUTION symbol on the equipment refers the user to the Product Manual for additional information. This symbol appears next to required information in the manual.

WARNING

PERSONAL INJURY: Risk of electrical shock. This symbol warns the user of a potential shock hazard where HAZARDOUS LIVE voltages greater than 30 Vrms, 42.4 Vpeak, or 60 VDC may be accessible. Failure to comply with these instructions could result in death or serious injury.

ATTENTION, Electrostatic Discharge (ESD) hazards. Observe precautions for handling electrostatic sensitive devices

Protective Earth (PE) terminal. Provided for connection of the protective earth (green or green/yellow) supply system conductor.

Functional earth terminal. Used for non-safety purposes such as noise immunity improvement. NOTE: This connection shall be bonded to protective earth at the source of supply in accordance with national local electrical code requirements.

Earth Ground. Functional earth connection. NOTE: This connection shall be bonded to Protective earth at the source of supply in accordance with national and local electrical code requirements.

Chassis Ground. Identifies a connection to the chassis or frame of the equipment shall be bonded to Protective Earth at the source of supply in accordance with national and local electrical code requirements.

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			Introduction
		Contents
1	INTRODUCTION ...................................................................................................		1
1.1		Overview.........................................................................................................................................	1
1.2		Function of Displays and Keys .......................................................................................................	3
1.3		Process Instrument Explorer Software............................................................................................	4
1.4		CE Conformity (Europe).................................................................................................................	5
2	INSTALLATION.....................................................................................................		7
2.1		Overview.........................................................................................................................................	7
2.2		Condensed Specifications ...............................................................................................................	8
2.3		Model Number Interpretation .......................................................................................................	12
2.4		Control and Alarm Relay Contact Information.............................................................................	14
2.5		Mounting.......................................................................................................................................	15
2.6		Wiring ...........................................................................................................................................	17
	2.6.1 Electrical Considerations ...................................................................................................		17
2.7		Wiring Diagrams...........................................................................................................................	19
3	CONFIGURATION...............................................................................................		32
3.1		Overview.......................................................................................................................................	32
3.2		Configuration Prompt Hierarchy ..................................................................................................	33
3.3		Configuration Procedure...............................................................................................................	34
3.4		Tuning Set Up Group....................................................................................................................	35
3.5		SP Ramp Set Up Group ................................................................................................................	39
3.6		Accutune Set Up Group ................................................................................................................	43
3.7		Algorithm Set Up Group...............................................................................................................	46
3.8		Output Set Up Group ....................................................................................................................	51
3.9		Input 1 Set Up Group....................................................................................................................	55
3.10		Input 2 Set Up Group ................................................................................................................	59
3.11		Control Set Up Group ...............................................................................................................	61
3.12		Options Group ...........................................................................................................................	67
3.13		Communications Group ............................................................................................................	73
3.14		Alarms Set Up Group ................................................................................................................	76
3.15		Display Set Up Group ...............................................................................................................	82
3.16		P.I.E. Tool Ethernet and Email Configuration Screens.............................................................	84
3.17		Configuration Record Sheet ......................................................................................................	87

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4	MONITORING AND OPERATING THE CONTROLLER.....................................			89
4.1		Overview.......................................................................................................................................		89
4.2		Operator Interface .........................................................................................................................		90
4.3	Entering a Security Code ..............................................................................................................			90
4.4		Lockout Feature ............................................................................................................................		91
4.5		Monitoring Your Controller..........................................................................................................		93
	4.5.1		Annunciators ......................................................................................................................	93
	4.5.2 Viewing the operating parameters......................................................................................			94
	4.5.3		Diagnostic Messages..........................................................................................................	95
4.6		Single Display Functionality.........................................................................................................		97
4.7	Start Up Procedure for Operation .................................................................................................			99
4.8		Control Modes ............................................................................................................................		100
	4.8.1		Mode Definitions .............................................................................................................	100
	4.8.2 What happens when you change modes...........................................................................			101
4.9		Setpoints......................................................................................................................................		101
4.10		Timer .......................................................................................................................................		102
4.11		Accutune III.............................................................................................................................		104
	4.11.1		Tune for Simplex Outputs ............................................................................................	105
	4.11.2		Tune for Duplex (Heat/Cool) .......................................................................................	105
	4.11.3		Using AUTOMATIC TUNE at start-up for Duplex (Heat/Cool).................................	106
	4.11.4		Using BLENDED TUNE at start-up for Duplex (Heat/Cool)......................................	106
	4.11.5		Using MANUAL TUNE at start-up for Duplex (Heat/Cool).......................................	107
	4.11.6		Error Codes...................................................................................................................	109
4.12		Fuzzy Overshoot Suppression .................................................................................................		110
4.13		Using Two Sets of Tuning Constants......................................................................................		110
4.14		Alarm Setpoints.......................................................................................................................		112
4.15		Three Position Step Control Algorithm...................................................................................		113
4.16		Setting a Failsafe Output Value for Restart After a Power Loss.............................................		114
4.17		Setting Failsafe Mode..............................................................................................................		115
4.18		Setpoint Rate/Ramp/Program Overview .................................................................................		115
4.19		Setpoint Ramp .........................................................................................................................		116
4.20		Setpoint Rate ...........................................................................................................................		117
4.21		Setpoint Ramp/Soak Programming .........................................................................................		118
4.22		P.I.E. Tool Maintenance Screens ............................................................................................		125
4.23		Configuring your Ethernet Connection ...................................................................................		131

5	INPUT CALIBRATION.......................................................................................	136
5.1	Overview.....................................................................................................................................	136
5.2	Minimum and Maximum Range Values .....................................................................................	137
5.3	Preliminary Information..............................................................................................................	139
5.4	Input 1 Set Up Wiring.................................................................................................................	140

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5.5		Input 1 Calibration Procedure.....................................................................................................		144
5.6		Input 2 Set Up Wiring.................................................................................................................		146
5.7		Input 2 Calibration Procedure.....................................................................................................		147
5.8		Restore Input Factory Calibration...............................................................................................		149
6	OUTPUT CALIBRATION...................................................................................			151
6.1		Overview.....................................................................................................................................		151
6.2		Current Output Calibration .........................................................................................................		152
6.3		Auxiliary Output Calibration ......................................................................................................		154
6.4		Restore Output Factory Calibration Procedure...........................................................................		156
7	TROUBLESHOOTING/SERVICE......................................................................			158
7.1		Overview.....................................................................................................................................		158
7.2		Troubleshooting Aids..................................................................................................................		159
7.3		Power-up Tests............................................................................................................................		161
7.4		Status Tests .................................................................................................................................		161
7.5		Background Tests........................................................................................................................		162
7.6		Controller Failure Symptoms......................................................................................................		164
7.7		Troubleshooting Procedures .......................................................................................................		165
7.8		Restoring Factory Configuration ................................................................................................		174
7.9		Software Upgrades......................................................................................................................		175
8	PARTS LIST ......................................................................................................			177
8.1		Exploded View............................................................................................................................		177
8.2		Removing the chassis..................................................................................................................		179
9	MODBUS RTU FUNCTION CODES..................................................................			180
9.1		Overview.....................................................................................................................................		180
9.2		General Information....................................................................................................................		180
9.3		Function Code 20 (14h) - Read Configuration Reference Data..................................................		182
	9.3.1		Read Configuration Examples .........................................................................................	184
9.4		Function Code 21 (15h) - Write Configuration Reference Data.................................................		186
	9.4.1		Write Configuration Examples ........................................................................................	188
10 MODBUS READ, WRITE AND OVERRIDE PARAMETERS PLUS EXCEPTION
CODES........................................................................................................................				189
10.1		Overview .................................................................................................................................		189
10.2		Reading Control Data..............................................................................................................		190
10.3 Read Software Options Status.................................................................................................				191
10.4		Miscellaneous Read Onlys ......................................................................................................		192

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	10.4.1		Register Addresses for Read Onlys ..............................................................................	192
	10.4.2		SetPoint Program Read Only Information ....................................................................	192
	10.5	Setpoints ..................................................................................................................................		193
	10.6	Using a Computer Setpoint (Overriding Controller Setpoint) ................................................		194
	10.7	Configuration Parameters........................................................................................................		196
	10.7.1		Tuning ..........................................................................................................................	196
	10.7.2		SP Ramp/Rate/Program ................................................................................................	198
	10.7.3		Accutune .......................................................................................................................	201
	10.7.4		Algorithm .....................................................................................................................	202
	10.7.5		Output Algorithms ........................................................................................................	203
	10.7.6		Input 1 ...........................................................................................................................	204
	10.7.7		Input 2 ...........................................................................................................................	207
	10.7.8		Control ..........................................................................................................................	209
	10.7.9		Options .........................................................................................................................	211
	10.7.10		Communications ...........................................................................................................	213
	10.7.11		Alarms ..........................................................................................................................	214
	10.7.12		Display ..........................................................................................................................	217
	10.8	Modbus RTU Exception Codes...............................................................................................		218
11	ETHERNET TCP/IP ...........................................................................................			220
	11.1	Overview .................................................................................................................................		220
12	FURTHER INFORMATION................................................................................			221
	12.1	Modbus RTU Serial Communications ....................................................................................		221
	12.2	Modbus Messaging on TCP/IP................................................................................................		221
	12.3	How to Apply Digital Instrumentation in Severe Electrical Noise Environments..................		221
13	INDEX		...............................................................................................................	222
14	SALES ......................................................................................AND SERVICE			226

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Tables

Table 2-1 Condensed Specifications _____________________________________________________ 8 Table 2-2 Control Relay Contact Information _____________________________________________ 14 Table 2-3 Alarm Relay Contact Information ______________________________________________ 14 Table 2-4 Mounting Procedure_________________________________________________________ 16 Table 2-5 Permissible Wiring Bundling__________________________________________________ 18 Table 2-6 Universal Output Functionality and Restrictions___________________________________ 20 Table 2-7 Terminals for connecting a UDC to a MDI Compliant Hub or Switch __________________ 30 Table 2-8 Terminals for connecting a UDC directly to a PC utilizing a straight-through cable ________ 30 Table 3-1 Configuration Topics ________________________________________________________ 32 Table 3-2 Configuration Prompt Hierarchy _______________________________________________ 33 Table 3-3 Configuration Procedure _____________________________________________________ 34 Table 3-4 TUNING Group (Numeric Code 100) Function Prompts ____________________________ 35 Table 3-5 SPRAMP Group (Numeric Code 200) Function Prompts ____________________________ 39 Table 3-6 ATUNE Group (Numeric Code 300) Function Prompts _____________________________ 44 Table 3-7 ALGOR Group (Numeric Code 400) Function Prompts _____________________________ 46 Table 3-8 OUTPUT Group (Numeric Code 500) Function Prompts ____________________________ 51 Table 3-9 INPUT 1 Group (Numeric Code 600) Function Prompts ____________________________ 55 Table 3-10 INPUT2 Group (Numeric Code 700) Function Prompts ____________________________ 59 Table 3-11 Table 3-12 CONTRL Group (Numeric Code 800) Function Prompts _________________ 61 Table 3-13 OPTION Group (Numeric Code 900) Function Prompts ___________________________ 67 Table 3-14 Communications Group (Numeric Code 1000) Function Prompts ____________________ 73 Table 3-15 ALARMS Group (Numeric Code 1100) Function Prompts _________________________ 76 Table 3-16 DISPLY Group (Numeric Code 1200) Function Prompts ___________________________ 82 Table 4-1 Procedure to Enter a Security Code _____________________________________________ 91 Table 4-2 Annunciators ______________________________________________________________ 93 Table 4-3 Lower Display Key Parameter Prompts__________________________________________ 94 Table 4-4 Diagnostic Messages_________________________________________________________ 95 Table 4-5 Single Display Parameters ____________________________________________________ 98 Table 4-6 Procedure for Starting Up the Controller _________________________________________ 99 Table 4-7 Control Mode Definitions ___________________________________________________ 100 Table 4-8 Changing Control Modes (Dual Display Only) ___________________________________ 101 Table 4-9 Procedure for Changing the Local Setpoints _____________________________________ 101 Table 4-10 Procedure for Switching Between Setpoints ____________________________________ 102 Table 4-11 Procedure for Starting “TUNE” ______________________________________________ 105 Table 4-12 Procedure for Using AUTOMATIC TUNE at Start-up for Duplex Control ____________ 106 Table 4-13 Procedure for Using BLENDED TUNE at Start-up for Duplex Control_______________ 107 Table 4-14 Procedure for Using MANUAL TUNE for Heat side of Duplex Control ______________ 107 Table 4-15 Procedure for Using MANUAL TUNE for Cool side of Duplex Control ______________ 108 Table 4-16 Procedure for Accessing Accutune Error Codes _________________________________ 109 Table 4-17 Accutune Error Codes _____________________________________________________ 109 Table 4-18 Set Up Procedure _________________________________________________________ 111 Table 4-19 Procedure for Switching PID SETS from the Keyboard ___________________________ 112 Table 4-20 Procedure for Displaying Alarm Setpoints _____________________________________ 112 Table 4-21 Procedure for Displaying 3Pstep Motor Position_________________________________ 113 Table 4-22 Procedure for Setting a Failsafe Value_________________________________________ 114 Table 4-23 Procedure for Setting a Failsafe Mode_________________________________________ 115 Table 4-24 Running A Setpoint Ramp __________________________________________________ 116 Table 4-25 Program Contents_________________________________________________________ 118

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Table 4-26 Run/Monitor Functions ____________________________________________________ 123 Table 5-1 Voltage, Milliamp and Resistance Equivalents for Input 1 Range Values ______________ 137 Table 5-2 Voltage and Milliamp Equivalents for Input 2 Range Values ________________________ 139 Table 5-3 Equipment Needed_________________________________________________________ 139 Table 5-4 Set Up Wiring Procedure for Thermocouple Inputs Using an Ice Bath ________________ 140 Table 5-5 Set Up Wiring Procedure for Thermocouple Inputs using Thermocouple Source ________ 141 Table 5-6 Set Up Wiring Procedure for RTD Inputs _______________________________________ 141 Table 5-7 Set Up Wiring Procedure for Radiamatic, Millivolts, Volts or Thermocouple Differential Inputs

(Except 0-10 Volts) _____________________________________________________________ 142 Table 5-8 Set Up Wiring Procedure for 0 to 10 Volts ______________________________________ 143 Table 5-9 Set Up Wiring Procedure for Milliampere Inputs _________________________________ 143 Table 5-10 Input 1 Calibration Procedure (Numeric Code 10000) ____________________________ 144 Table 5-11 Set Up Wiring Procedure for 0 to 20 mA or 4 to 20 mA Inputs – Input 2______________ 146 Table 5-12 Set Up Wiring Procedure for 0 to 2 Volts, 0 to 5 Volts, or 1 to 5 Volts – Input 2________ 147 Table 5-13 Input 2 Calibration Procedure (Numeric Code 20000) ____________________________ 148 Table 5-14 Restore Factory Calibration _________________________________________________ 149 Table 6-1 Set Up Wiring Procedure for Current Output ____________________________________ 152 Table 6-2 Current Output Calibration Procedure (Numeric Code 30000) ______________________ 153 Table 6-3 Set Up Wiring Procedure for Auxiliary Output ___________________________________ 154 Table 6-4 Auxiliary Output Calibration Procedure (Numeric Code 50000) _____________________ 155 Table 6-5 Restore Factory Calibration Procedure _________________________________________ 156 Table 7-1 Procedure for Identifying the Software Version __________________________________ 160 Table 7-2 Procedure for Displaying the Status Test (Numeric Code 1200) Results _______________ 161 Table 7-3 Background Tests__________________________________________________________ 162 Table 7-4 Controller Failure Symptoms_________________________________________________ 164 Table 7-5 Troubleshooting Power Failure Symptoms ______________________________________ 166 Table 7-6 Troubleshooting Current Output Failure ________________________________________ 166 Table 7-7 Troubleshooting Three Position Step Control Output Failure ________________________ 167 Table 7-8 Troubleshooting Time Proportional Output Failure _______________________________ 168 Table 7-9 Troubleshooting Current/Time or Time/Current Proportional Output Failure ___________ 169 Table 7-10 Troubleshooting Alarm Relay Output Failure ___________________________________ 170 Table 7-11 Troubleshooting a Keyboard Failure __________________________________________ 171 Table 7-12 Troubleshooting a RS-485 Communications Failure______________________________ 172 Table 7-13 Troubleshooting an Ethernet Communications Failure ____________________________ 173 Table 7-14 Troubleshooting Auxiliary Output Failure _____________________________________ 173 Table 7-15 Restoring Factory Configuration _____________________________________________ 174 Table 7-16 Software Upgrades________________________________________________________ 175 Table 8-1 Parts Identification _________________________________________________________ 178 Table 8-2 Parts Not Shown___________________________________________________________ 178 Table 8-3 Software Upgrades (see Section 7.9) ___________________________________________ 178 Table 9-1 Integer Parameter Type _____________________________________________________ 181 Table 9-2 Floating Point Parameter Type________________________________________________ 181 Table 9-3 Register Address Format for Function Code 20___________________________________ 183 Table 9-4 Register Address Format for Function Code 21___________________________________ 187 Table 10-1 Control Data Parameters ___________________________________________________ 191 Table 10-2 Option Status ____________________________________________________________ 191 Table 10-3 Miscellaneous Read Onlys__________________________________________________ 192 Table 10-4 SetPoint Program Read Only Information ______________________________________ 192 Table 10-5 Setpoint Code Selections ___________________________________________________ 193 Table 10-6 Setpoint Associated Parameters ______________________________________________ 193

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Introduction

Table 10-7 Computer Setpoint Selection ________________________________________________ 194 Table 10-8 Computer Setpoint Associated Parameters _____________________________________ 195 Table 10-9 Set-up Group – Tuning ____________________________________________________ 196 Table 10-10 Set-up Group – Setpoint Ramp/Rate _________________________________________ 198 Table 10-11 Set-up Group – Accutune__________________________________________________ 201 Table 10-12 Set-up Group – Algorithm _________________________________________________ 202 Table 10-13 Set-up Group – Output____________________________________________________ 203 Table 10-14 Set-up Group – Input 1____________________________________________________ 204 Table 10-15 Set-up Group – Input 2____________________________________________________ 207 Table 10-16 Set-up Group – Control ___________________________________________________ 209 Table 10-17 Set-up Group – Options ___________________________________________________ 211 Table 10-18 Set-up Group – Communications____________________________________________ 213 Table 10-19 Set-up Group – Alarms ___________________________________________________ 214 Table 10-20 Set-up Group – Display ___________________________________________________ 217 Table 10-21 Modbus RTU Data Layer Status Exception Codes ______________________________ 219

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Figures

Figure 1-1 UDC2500 Operator Interface (all display items shown) _____________________________ 2 Figure 1-2 Screen capture of Process Instrument Explorer running on a Pocket PC _________________ 4 Figure 1-3 Depiction of infrared communications ___________________________________________ 5 Figure 2-1 Model Number Interpretation _________________________________________________ 13 Figure 2-2 Mounting Dimensions (not to scale)____________________________________________ 15 Figure 2-3 Mounting Methods _________________________________________________________ 16 Figure 2-4 Composite Wiring Diagram __________________________________________________ 21 Figure 2-5 Mains Power Supply________________________________________________________ 22 Figure 2-6 Input 1 Connections ________________________________________________________ 23 Figure 2-7 Input 2 Connections ________________________________________________________ 24 Figure 2-8 Electromechanical Relay Output ______________________________________________ 24 Figure 2-9 Solid State Relay Output ____________________________________________________ 25 Figure 2-10 Open Collector Output _____________________________________________________ 26 Figure 2-11 Dual Electromechanical Relay Option Output ___________________________________ 27 Figure 2-12 Current Output ___________________________________________________________ 27 Figure 2-13 Three Position Step Control Connections w/o Dual Relay Option____________________ 28 Figure 2-14 Three Position Step Control Connections with Dual Relay Option ___________________ 28 Figure 2-15 RS-422/485 Communications Option Connections _______________________________ 29 Figure 2-16 Ethernet Communications Option Connections __________________________________ 29 Figure 2-17 Auxiliary Output and Digital Inputs Option Connections __________________________ 30 Figure 2-18 Transmitter Power for 4-20 mA — 2 wire Transmitter Using Open Collector Alarm 2 Output31 Figure 2-19 Transmitter Power for 4-20 mA — 2 Wire Transmitter Using Auxiliary Output ________ 31 Figure 3-1 Ethernet Configuration Screen ________________________________________________ 84 Figure 3-2 Email Configuration Screen __________________________________________________ 85 Figure 4-1 Operator Interface__________________________________________________________ 90 Figure 4-2 Functional Overview Block Diagram of the UDC2500 Controller ____________________ 96 Figure 4-3 Ramp/Soak Profile Example_________________________________________________ 121 Figure 4-4 Program Record Sheet _____________________________________________________ 122 Figure 4-5 Maintenance Data Menu____________________________________________________ 125 Figure 4-6 Loop Data Maintenance Screen ______________________________________________ 126 Figure 4-7 Alarm Details Maintenance Screen ___________________________________________ 127 Figure 4-8 Digital Input Details Screen _________________________________________________ 128 Figure 4-9 Status Data Maintenance Screen______________________________________________ 129 Figure 4-10 Ethernet Status Maintenance Screen__________________________________________ 130 Figure 4-11 IR Communications Address _______________________________________________ 131 Figure 4-12 Online Configuration _____________________________________________________ 132 Figure 4-13 Configuration Upload in Progress ___________________________________________ 132 Figure 4-14 Ethernet Communications Type Selection _____________________________________ 133 Figure 4-15 Ethernet Communications Address __________________________________________ 134 Figure 4-16 Configuration Upload in Progress ___________________________________________ 135 Figure 5-1 Input 1 and Input 2 Wiring Terminals _________________________________________ 139 Figure 5-2 Wiring Connections for Thermocouple Inputs Using an Ice Bath ____________________ 140 Figure 5-3 Wiring Connections for Thermocouple Inputs Using Thermocouple Source ___________ 141 Figure 5-4 Wiring Connections for RTD (Resistance Thermometer Device) ____________________ 141 Figure 5-5 Wiring Connections for Radiamatic, Thermocouple Differential, Millivolts or Volts (Except 0 to 10

Volts) ________________________________________________________________________ 142 Figure 5-6 Wiring Connections for 0 to 10 Volts__________________________________________ 143 Figure 5-7 Wiring Connections for 0 to 20 mA or 4 to 20 mA Inputs__________________________ 143

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Introduction

Figure 5-8 Wiring Connections for 0 to 20 mA or 4 to 20 mA Input – Input 2 ___________________ 146 Figure 5-9 Wiring Connections for 0 to 2 Volts, 0 to 5 Volts or 1 to 5 Volts Input – Input 2________ 147 Figure 6-1 Wiring Connections for Calibrating Current Output ______________________________ 152 Figure 6-2 Wiring Connections for Calibrating Auxiliary Output _____________________________ 154 Figure 8-1 UDC2500 Exploded View __________________________________________________ 177 Figure 10-1 Software Option Status Information __________________________________________ 191

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1 Introduction

1.1 Overview

Function

The UDC2500 is a microprocessor-based stand-alone controller. It combines a high degree of functionality and operating simplicity in a 1/4 DIN size controller. This instrument is an ideal controller for regulating temperature and other process variables in numerous heating and cooling applications, as well as in metal working, food, pharmaceuticals, semiconductor, testing and environmental work.

The UDC2500 monitors and controls temperatures and other variables in applications such as environmental chambers, plastic processing machines, furnaces and ovens, and packaging machinery.

Features

•90 – 264 Vac or 24 Vac/dc Power Supply

•Input/Output Isolation

•Isolated Auxiliary Current Output / Digital Inputs

•Modbus® RS-485, Infrared, or Ethernet TCP/IP Communications

•Infrared interface

•Timer

•Accutune III Tuning with Fuzzy Logic Overshoot Suppression.

•2nd Input (Remote Setpoint)

•Setpoint Ramp/Rate/Program

•Three Position Step Control

•Duplex (Heat/Cool)

Easy to Read Displays

The dedicated vacuum fluorescent displays with multi-language prompts make the operator interface easy to read, understand and operate. Programmed sequences of displays assure quick and accurate entry of all configurable parameters.

Easy to Operate

Simple keystrokes let you select input and range configuration, set the operating parameters that meet you process control needs now, and change them later to meet new ones.

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Mount Anywhere

This instrument is intended for industrial control applications. It must be panel mounted with the wiring terminals enclosed within the panel. The instrument is environmentally hardened and, when suitably enclosed, can be mounted anywhere in plant or factory, on the wall, or even on the process machine itself. The front face is NEMA3 and IP55 rated and can be easily changed to NEMA4X and IP66 for the most severe hose-down applications. It withstands ambient temperatures up to 55°C (133°F) and resists the effects of vibration and shock.

Figure 1-1 UDC2500 Operator Interface (all display items shown)

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1.2 Function of Displays and Keys

Table 1-1 shows each key on the operator interface and defines its function.

Table 1-1Function of Displays and Keys

Key

Setup

Function

Function

•Places the controller in the Configuration Set Up group select mode. Sequentially displays Set Up groups and allows the FUNCTION key to display individual functions in each Set Up group.

•Used in conjunction with the SET UP key to select the individual functions of a selected Configuration Set Up group.

•Used during field calibration procedure.

			•	Selects an operating parameter to be shown in the lower display. See
	Lower
				Section 4.5.2 for a list of the operating parameters and Section 4.5.3 for a list
	Display
				of the diagnostic messages.
			• Alternately selects:
				AUTO Lower display automatically displays setpoint value in engineering
	M-A
					units.
	Reset
				MAN	Lower display automatically indicates output in %.
				RESET Only used on Limit Controllers to reset the Limit Relay.
			•	Setpoint Select Hold key down to cycle through configured setpoints.
	SP
	Select
			•	Alternate action switch initiates or holds the Setpoint Ramp or Setpoint
				Program.
	Run
	Hold		•	Acknowledges a latched alarm 1.
			• Acknowledges Diagnostic Messages.
			•	Increases the selected parameter value.
			•	Decreases the selected parameter value.

Note 1: Value can be changed if in manual mode. For Three Position Step Control when a slidewire is not used, the output value is the estimated motor position.

Note 2: Value can be changed via increment/decrement keys.

Note 3: The selected set can be changed via increment/decrement keys.

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Introduction

1.3 Process Instrument Explorer Software

Overview

Process Instrument Explorer lets you configure your instrument on a desktop/laptop or Pocket PC. For details see Process Instrument Explorer manual #51-52-25-131.

Features

•Create configurations with intuitive software program running on either a Pocket PC, a Desktop or a laptop computer. ·

•Create/edit configurations live, just connect software to controller via comm port.·

•Create/edit configurations offline and download to controller later via comm. port.·

•Port types available on every UDC2500:·

o Infrared o RS 485

oEthernet

•Same port types on UDC3200 and UDC3500 allow interconnectivity.

•This software is available in English, Spanish, Italian, German and French.

Figure 1-2 Screen capture of Process Instrument Explorer running on a Pocket PC

Infrared communications

The infrared connection provides a non-intrusive wireless connection with the instrument and maintains NEMA4X AND IP66 integrity.

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Introduction

No need to get access to the back of the controller to communicate with the instrument, no need to take your screw driver to wire the communication cable, no wiring mistake possible. You can now duplicate an instrument’s configuration, upload or download a new configuration in a matter of seconds, just by pointing your Pocket PC in the direction of the instrument.

It takes just a few seconds to upload a configuration from an instrument. You can then save the configuration file onto your PC or pocket PC for review, modification or archiving. Furthermore, this software also gives you important maintenance information on the controller: instantly, get information on the current operating parameters, digital inputs and alarm status, identify internal or analog input problems.

Question: What if I have several controllers on the same panel? How can I be sure I am communicating with the correct one?

Answer: The infrared port of the controller is normally “off”. You activate the infrared port by pressing any controller’s key. You can now communicate. After 4 minutes, the port will be shut down again. Also, in the Communications Group “IR ENABLE” may be disabled to prohibit IR communications.

Figure 1-3 Depiction of infrared communications

1.4 CE Conformity (Europe)

This product is in conformity with the protection requirements of the following European Council Directives: 73/23/EEC, the Low Voltage Directive, and 89/336/EEC, the EMC Directive. Conformity of this product with any other “CE Mark” Directive(s) shall not be assumed.

Product Classification: Class I: Permanently connected, panel-mounted Industrial Control Equipment with protective earthing (grounding) (EN61010-1).

Enclosure Rating: This controller must be panel-mounted with the rear terminals enclosed within the panel. The front panel of the controller is rated at NEMA4X and IP66 when properly installed.

Installation Category (Overvoltage Category): Category II (EN61010-1)

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Introduction

Pollution Degree: Pollution Degree 2: Normally non-conductive pollution with occasional conductivity caused by condensation. (Ref. IEC 664-1)

EMC Classification: Group 1, Class A, ISM Equipment (EN61326, emissions), Industrial Equipment (EN61326, immunity)

Method of EMC Assessment: Technical File (TF) Declaration of Conformity: 51453655

Deviation from the installation conditions specified in this manual, and the special conditions for CE conformity in Subsection 2.1, may invalidate this product’s conformity with the Low Voltage and EMC Directives.

ATTENTION

The emission limits of EN61326 are designed to provide reasonable protection against harmful interference when this equipment is operated in an industrial environment. Operation of this equipment in a residential area may cause harmful interference. This equipment generates, uses, and can radiate radio frequency energy and may cause interference to radio and television reception when the equipment is used closer than 30 meters (98 feet) to the antenna(e). In special cases, when highly susceptible apparatus is used in close proximity, the user may have to employ additional mitigating measures to further reduce the electromagnetic emissions of this equipment.

WARNING

If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

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2 Installation

2.1 Overview

Introduction

Installation of the UDC2500 consists of mounting and wiring the controller according to the instructions given in this section. Read the pre-installation information, check the model number interpretation (Subsection 2.3), and become familiar with your model selections, then proceed with installation.

What’s in this section?

The following topics are covered in this section.

	TOPIC	See Page
2.1	Overview	7
2.2	Condensed Specifications	8
2.3	Model Number Interpretation	12
2.4	Control and Alarm Relay Contact Information	14
2.5	Mounting	15
2.6	Wiring	17
2.7	Wiring Diagrams	19
	Composite Wiring Diagram	21
	AC Line Voltage	22
	Input 1 Connections	23
	Input 2 Connections	24
	Relay Output
	Electromechanical	24
	Solid State	25
	Open Collector	26
	Dual Electromechanical Relay	27
	Current Output Connections	27
	Three Position Step Control Connections w/o Dual Relay	28
	Three Position Step Control Connections with Dual Relay	28
	RS-422/485 Communications Option	29
	Ethernet Communications Option	29
	Auxiliary Output and Digital Inputs Option	30
	Transmitter Power using Open Collector Output	31
	Transmitter Power using Auxiliary Output	31

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Pre-installation Information

If the controller has not been removed from its shipping carton, inspect the carton for damage then remove the controller.

•Inspect the unit for any obvious shipping damage and report any damage due to transit to the carrier.

•Make sure a bag containing mounting hardware is included in the carton with the controller.

•Check that the model number shown on the inside of the case agrees with what you have ordered.

2.2Condensed Specifications

Honeywell recommends that you review and adhere to the operating limits listed in Table 2-1 when you install your controller.

Table 2-1 Condensed Specifications

Specifications

Analog Inputs	Accuracy:
	± 0.25% of full scale typical (± 1 digit for display)
	Can be field calibrated to ± 0.05% of full scale typical
	16-bit resolution typical
	Sampling Rate: Both inputs are sampled six times per second
	Temperature Stability: ± 0.01% of Full Scale span / ˚C change—typical
	Input Impedance:
	4-20 Milliampere Input: 250 ohms
	0-10 Volt Input: 200K ohms
	All Others: 10 megohms
	Maximum Lead Wire Resistance:
	Thermocouples: 50 ohms/leg
	100 ohm, 200 ohm and 500 ohm RTD: 100 ohms/leg
	100 ohm Low RTD: 10 ohms/leg
Analog Input Signal	Burnout Selections: Upscale, Downscale, Failsafe or None
Failure Operation	Thermocouple Health: Good, Failing, Failure Imminent or Failed
	Failsafe Output Level: Configurable 0-100% of Output range
Stray Rejection	Common Mode
	AC (50 or 60 Hz): 120 dB (with maximum source impedance of 100 ohms) or ± 1 LSB (least
	significant bit) whichever is greater with line voltage applied.
	DC: 120 dB (with maximum source impedance of 100 ohms) or a ±1 LSB whichever is
	greater with 120 Vdc applied.
	DC (to 1 KHz): 80 dB (with maximum source of impedance of 100 ohms) or ±1 LSB
	whichever is greater with 50 Vac applied.
	Normal Mode
	AC (50 or 60 Hz): 60 dB (with 100 % span peak-to-peak maximum)
Digital Inputs (Two)	+30 Vdc source for external dry contacts or isolated solid state contacts. Digital Inputs are
(Optional)	isolated from line power, earth ground, analog inputs and all outputs except for the Second
	Current Output.
	The second Digital Input is mutually exclusive with the Second Current Output.

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		Installation
		Specifications
Controller Output		Electromechanical Relays (One or Two)
Types		SPDT contacts. Both Normally Open and Normally Closed contacts are brought out to the
		rear terminals. Internally socketed.
		Resistive Load: 5 amps @ 120 Vac or 240 Vac or 30 Vdc
		Inductive Load (cosϕ = 0.4): 3 amps @ 130 Vac or 250 Vac
		Inductive Load (L/R = 7 msec): 3.5 amps @ 30 Vdc
		Motor: 1/6 H.P.
		Dual Electromechanical Relays
		Two SPST contacts. One Normally Closed contact for each relay is brought out to the rear
		terminals. Useful for Time Duplex or Three Position Step control applications, this option
		takes the place of one of the above electromechanical relays, thus saving it for use as an
		alarm. Units with this output option may have two additional relays (total of four relays) plus
		the Second Current Output. Relays are internally socketed.
		Resistive Load: 2 amps @ 120 Vac, 240 Vac or 30 Vdc
		Inductive Load (cosϕ = 0.4): 1 amp @ 130 Vac or 250 Vac
		Inductive Load (L/R = 7 msec): 1 amp @ 30 Vdc
		Solid State Relays (One or Two)
		Zero-crossing type SPST solid state contacts consisting of a triac N.O. output. Internally
		socketed.
		Resistive Load: 1.0 amp @ 25°C and 120 or 240 Vac, 0.5 amp @ 55°C and 120 or 240 Vac
		Inductive Load: 50 VA @ 120 Vac or 240 Vac
		Minimum Load: 20 milliamps
		Open Collector Outputs (One or Two)
		Socketed assembly replacing a relay. Opto-isolated from all other circuits except current
		output and not from each other. Internally powered @ 30 Vdc.
		Note: Applying an external power supply to this output will damage the instrument.
		Maximum Sink Current: 20 mA
		Short-circuit current limit: 100 mA
		Current Outputs (One or Two)
		These outputs provide a 21 mA dc maximum into a negative or positive grounded load or into
		a non-grounded load. Current outputs are isolated from each other, line power, earth ground
		and all inputs. Outputs can be easily configured via the keyboard for either direct or reverse
		action and for either 0 to 20 mA or 4 to 20 mA without field calibration.
		The second current output can be used in an Auxiliary Output mode. This Auxiliary Output
		can be configured to represent either Input, PV, Setpoint, Deviation, or Control output. The
		range of an Auxiliary Output can be scaled per the range of the selected variable and can be
		set anywhere between 0 to 21 mA. The Second Current Output is mutually exclusive with the
		second Digital Input.
		Resolution: 12 bits over 0 to 21 mA
		Accuracy: 0.05% of full scale
		Temperature Stability: 0.01% F.S./°C
		Load Resistance: 0 to 1000 ohms
Alarm Outputs		One SPDT Electromechanical relay. A second alarm is available if the second control relay
(Optional)		is not used for control purposes or when the Dual Relay Option is used.
		Up to four setpoints are independently set as high or low alarm, two for each relay. Setpoint
		can be on any Input, Process Variable, Deviation, Manual Mode, Failsafe, PV Rate, RSP
		Mode, Communication Shed, or Output. A single adjustable hysteresis of 0.0 to 100.0% is
		provided. The alarm can also be set as an ON or OFF event at the beginning of a Setpoint
		ramp/soak segment.
		Alarm Relay Contacts Rating: Resistive Load: 5 amps at 120 Vac or 240 Vac or 30 Vdc
Isolation (Functional)		Analog Inputs: are isolated from all other circuits at 850Vdc for 2 seconds, but not from each
		other.
		Analog Outputs: are isolated from all other circuits at 850Vdc for 2 seconds.
		AC Power: is electrically isolated from all other inputs and outputs to withstand a HIPOT
		potential of 1900Vdc for 2 seconds per Annex K of EN61010-1.
		Relay Contacts: with a working voltage of 115/230 Vac, are isolated from each other and all
		other circuits at 345Vdc for 2 seconds.

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	Specifications
RS422/485 Modbus	Baud Rate: 4800, 9600,19,200 or 38,400 baud selectable
RTU	Data Format: Floating point or integer
Communications	Length of Link:
Interface (Optional)	2000 ft (600 m) max. with Belden 9271 Twinax Cable and 120 ohm termination resistors
	4000 ft. (1200 m) max. with Belden 8227 Twinax Cable and 100 ohm termination resistors
	Link Characteristics: Two-wire, multi-drop Modbus RTU protocol, 15 drops maximum or up
	to 31 drops for shorter link length.
Ethernet TCP/IP	Type: 10Base-T
Communications	Length of Link: 330 ft. (100 m) maximum. Use Shielded twisted-pair, Category 5 (STP
Interface (Optional)	CAT5) Ethernet cable.
	Link Characteristics: Four-wire plus shield, single drop, five hops maximum
	IP Address: IP Address is 10.0.0.2 as shipped from the Factory
	Recommended network configuration: Use Switch rather than Hub in order to maximize
	UDC Ethernet performance.
	Configuration: Ethernet parameters are configured via the Process Instrument Explorer.
	Email: The capability to send an Email is provided. This must be configured via the Process
	Instrument Explorer.
Infrared	Type: Serial Infrared (SIR)
Communications	Length of Link: 3 ft. (1 m) maximum for IrDA 1.0 compliant devices
(Optional)	Baud Rate: 19,200 or 38,400 baud selectable
Power Consumption	20 VA maximum (90 to 264 Vac)
	15 VA maximum (24 Vac/dc)
Power Inrush Current	10A maximum for 4 ms (under operating conditions), reducing to a maximum of 225 mA (90
	to 264 Vac operation) or 750 mA (24 Vac/dc operation) after one second.

		CAUTION	When applying power to more than one instrument, make sure that sufficient
	power is supplied. Otherwise, the instruments may not start up normally due to voltage drop
	from the inrush current.
Weight	3 lbs. (1.3 kg)

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Environmental and Operating Conditions

Parameter		Reference	Rated	Operative	Transportation and
				Limits	Storage
Ambient Temperature	25	± 3 °C	15 to 55 °C	0 to 55 °C	–40 to 66 °C
	77	± 5 °F	58 to 131 °F	32 to 131 °F	–40 to 151 °F
Relative Humidity	10 to 55*		10 to 90*	5 to 90*	5 to 95*
Vibration	0		0 to 70	0 to 200	0 to 200
Frequency (Hz)
Acceleration (g)	0		0.4	0.6	0.5
Mechanical Shock	0		1	5	20
Acceleration (g)
Duration (ms))	0		30	30	30
Line Voltage (Vdc)	+24 ± 1		22 to 27	20 to 27	- -
Line Voltage (Vac)	120 ± 1		90 to 240	90 to 264	- -
90 to 240 Vac
	240 ± 2				- -
24 Vac	24	± 1	20 to 27	20 to 27	- -
Frequency (Hz)	50	± 0.2	49 to 51	48 to 52	- -
(For Vac)	60	± 0.2	59 to 61	58 to 62	- -

*The maximum moisture rating only applies up to 40 °C (104 °F). For higher temperatures, the RH specification is derated to maintain constant moisture content.

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2.3 Model Number Interpretation

Introduction

Write your controller’s model number in the spaces provided below and circle the corresponding items in each table. This information will also be useful when you wire your controller.

Instructions

Select the desired key number. The arrow to the right marks the selection available.

Make the desired selections from Tables I through VI using the column below the

proper arrow.

A dot (

) denotes availability.

Key Number

I

II

III

IV

V

VI

_ _ _ _ _ _

-

_ _

-

_ _ _ _

-

_ _ _

-

_ _ _ _ _

-

_ _

_

KEY NUMBER - UDC2500 Single Loop Controller

Description

Digital Controller for use with 90 to 264Vac Power

Digital Controller for use with 24Vac/dc Power

TABLE I - Specify Control Output and/or Alarms

		None (Can be used as an indicator only)
		Current Output (4 to 20ma, 0 to 20 ma)
	Output #1	Electro Mechanical Relay (5 Amp Form C)
		Solid State Relay (1 Amp)
		Open Collector transistor output
		Dual 2 Amp Relays (Both are Form A) (Heat/Cool Applications)
		No Additional Outputs or Alarms
	Output #2 and Alarm	One Alarm Relay Only
	#1 or Alarms 1 and 2	E-M Relay (5 Amp Form C) Plus Alarm 1 (5 Amp Form C Relay)
		Solid State Relay (1 Amp) Plus Alarm 1 (5 Amp Form C Relay)
		Open Collector Plus Alarm 1 (5 Amp Form C Relay)

TABLE II - Communications and Software Selections

		None
	Communications	Auxiliary Output/Digital Inputs (1 Aux and 1 DI or 2 DI)
		RS-485 Modbus Plus Auxiliary Output/Digital Inputs
		10 Base-T Ethernet (Modbus RTU) Plus Auxiliary Output/Digital Inputs
		Standard Functions, Single Display
	Software Selections	Dual Display with Auto/Manual
		Set Point Programming (12 Segments) Dual Display, Auto/Manual
		Limit Controller
	Reserved	No Selection
	Infrared interface	None
		Infrared Interface Included (Can be used with a Pocket PC)

TABLE III - Input 1 can be changed in the field using external resistors

	Input 1	TC, RTD, mV, 0-5V, 1-5V
		TC, RTD, mV, 0-5V, 1-5V, 0-20mA, 4-20mA
		TC, RTD, mV, 0-5V, 1-5V, 0-20mA, 4-20mA, 0-10V
	Input 2	None
		0-5V, 1-5V, 0-20mA, 4-20mA

TABLE IV - Options

	Approvals	CE, UL and CSA (Standard)
		CE, UL, CSA and FM
		CE Only
	Tags	None
		Stainless Steel Customer ID Tag - 3 lines w/22 characters/line
	Future Options	None
		None
		None

Selection Availability

DC2500

DC2501

0 _ C _ E _ A _ T _ R _

_ 0 _ B _ E _ A _ T

0 _ _ _
1 _ _ _
2 _ _ _
3 _ _ _
_ 0 _ _
_ A _ _
_ B _ _
_ L _ _	a	a
_ _ 0 _
_ _ _ 0
_ _ _ R
	Availability
DC 2500		2501
Selection
1 _ _
2 _ _
3 _ _
_ 00
_ 10	b	b
0 _ _ _ _
1 _ _ _ _	c	c
2 _ _ _ _
_ 0 _ _ _
_ T _ _ _
_ _ 0 _ _
_ _ _ 0 _
_ _ _ _ 0

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TABLE V - Product Manuals

		Product Information on CD - English
		English (Hard Copy) Manual	(51-52-25-127)
	Manuals	French (Hard Copy) Manual	(51-52-25-127-FR)
		German (Hard Copy) Manual	(51-52-25-127-DE)
		Italian (Hard Copy) Manual	(51-52-25-127-IT)
		Spanish (Hard Copy) Manual	(51-52-25-127-SP)
	Certificate	None
		Certificate of Conformance (F3391)

TABLE VI

No Selection	None
RESTRICTIONS
Restriction Letters	Available Only With			Not Available With
	Table	Selection	Table	Selection
a	I	E _
	I	A _
	I	T _
Limit Controller Restrictions/Comments:
1. FM approved units with communications are limited to read only.
2. UL listed for regulatory use only.
b			II	_ L _ _
c	II	_ L _ _	I	C _, R _

0 _

E_

F_

G_

I _

S _

_ 0 _ C

0

Figure 2-1 Model Number Interpretation

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2.4 Control and Alarm Relay Contact Information

Control Relays

ATTENTION

Control relays operate in the standard control mode (that is, energized when output state is on).

Table 2-2 Control Relay Contact Information

Unit Power	Control Relay	Control Relay	Output #1 or #2
	Wiring	Contact	Indicator Status
Off	N.O.	Open	Off
	N.C.	Closed
On	N.O.	Open	Off
		Closed	On
	N.C.	Closed	Off
		Open	On

Alarm Relays

ATTENTION

Alarm relays are designed to operate in a failsafe mode (that is, de-energized during alarm sate). This results in alarm actuation when power is OFF or when initially applied, until the unit completes self diagnostics. If power is lost to the unit, the alarms will de-energize and thus the alarm contacts will close.

Table 2-3 Alarm Relay Contact Information

Unit

Alarm Relay

Variable NOT in Alarm State

Variable in Alarm State

Power

Wiring

Relay

Indicators

Relay

Indicators

Contact

Contact

Off

N.O.

Open

Off

Open

Off

N.C.

Closed

Closed

On

N.O.

Closed

Off

Open

On

N.C.

Open

Closed

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2.5 Mounting

Physical Considerations

The controller can be mounted on either a vertical or tilted panel using the mounting kit supplied. Adequate access space must be available at the back of the panel for installation and servicing activities.

•Overall dimensions and panel cutout requirements for mounting the controller are shown in Figure 2-2.

•The controller’s mounting enclosure must be grounded according to CSA standard C22.2 No. 0.4 or Factory Mutual Class No. 3820 paragraph 6.1.5.

•The front panel is moisture rated NEMA3 and IP55 rated and can be easily upgraded to NEMA4X and IP66.

Overall Dimensions

	Max. panel thickness
mm	19,1
		9,0
	.75
inches		0,35

92,0 + 0,8 - 0,00

3,62 + 0,03 -0,00

90,6 108,6 3,57 4,28

Panel

Cutout

	92,0	+ 0,8
								113,1
		- 0,00
			17,9					4,45
	3,62	+ 0,03
			0,70
		-0,00

Figure 2-2 Mounting Dimensions (not to scale)

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Mounting Method

Before mounting the controller, refer to the nameplate on the outside of the case and make a note of the model number. It will help later when selecting the proper wiring configuration.

Mounting clips

Attach screws and washers here for water protection

			Figure 2-3 Mounting Methods
Mounting Procedure
			Table 2-4 Mounting Procedure
	Step		Action

1Mark and cut out the controller hole in the panel according to the dimension information in Figure 2-2.

2Orient the case properly and slide it through the panel hole from the front.

3Remove the mounting kit from the shipping container and install the kit as follows:

•For normal installation two mounting clips are required. Insert the prongs of the clips into the two holes in the top and bottom center of the case (Figure 2-3).

•For water-protected installation four mounting clips are required. There are two options of where to install the mounting clips: 1) Insert the prongs of the clips into the two holes on the left and right side of the top and bottom of the case or 2) on the center on each of the four sides (Figure 2-3).

•Tighten screws to 2 lb-inch (22 N•cm) to secure the case against the panel. CAUTION: Over tightening will cause distortion and the unit may not seal properly.

4For water-protected installation, install four screws with washers into the four recessed areas in the corners of the front bezel (Figure 2-3). Push the point of the screw through the center piercing the elastomeric material and then tighten screws to 5 lb-in (56 N•cm).

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