YOKOGAWA UT35A-L User manual

User’s
Manual UT35A-L
Digital Indicating Controller
(Limit Control Type)
User’s Manual
IM 05P04D41-01EN
IM 05P04D41-01EN
2nd Edition

Product Registration
Thank you for purchasing YOKOGAWA products.
YOKOGAWA provides registered users with a variety of information and services.
Please allow us to serve you best by completing the product registration form accessible
from our homepage.
http://www.yokogawa.com/ns/reg/

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2nd Edition : Mar. 2016 (YK)
All Rights Reserved, Copyright © 2011 Yokogawa Electric Corporation
Introduction
Thank you for purchasing the UT35A-L digital indicating controller (hereinafter referred to
as UT35A-L).
This manual describes how to use UT35A-L functions other than UT35A-L’s
communication function. Please read through this user’s manual carefully before using
the product.
● Printedmanual
Manual Name Manual Number Description
UT35A-L Operation Guide IM 05P04D41-11EN This manual describes the basic
operation method.
● Electronicmanuals
Manual Name Manual Number Description
UT35A-L Operation Guide IM 05P04D41-11EN This is identical to the printed manual.
UT35A-L
User’s Manual IM 05P04D41-01EN
This manual. It describes the usage of
all functions except the communication
functions.
UTAdvanced Series
Communication Interface
(RS-485, Ethernet)
User’s Manual
IM 05P07A01-01EN
This manual describes how to use
UT35A/UT32A in Ethernet and serial
communications. For communication
wiring, see the Operation Guide or User’
s Manual.
LL50A Parameter Setting
Software Installation Manual IM 05P05A01-01EN This manual describes how to install and uninstall the LL50A.
LL50A Parameter Setting
Software User’s Manual IM 05P05A01-02EN
This manual describes how to use the
LL50A, ladder sequence function, peer-
to-peer communication, and network
profile creating function.
* User’s Manual can be downloaded from a website.
http://www.yokogawa.com/ns/ut/im/
● GeneralSpecifications
GeneralSpecificationName GSNumber
UT35A-L Digital Indicating Controller (Limit Control Type) GS 05P04D41-01EN
LL50A Parameter Setting Software GS 05P01A01-01EN
* The last two characters of the manual number and general specification number indicate the
language in which the manual is written.
Target Readers
This guide is intended for the following personnel;
● Engineersresponsibleforinstallation,wiring,andmaintenanceoftheequipment.
● Personnelresponsiblefornormaldailyoperationoftheequipment.
Notice
● Thecontentsofthismanualaresubjecttochangewithoutnoticeasaresultof
continuing improvements to the instrument’s performance and functions.
● Everyefforthasbeenmadetoensureaccuracyinthepreparationofthismanual.
Should any errors or omissions come to your attention, however, please inform
YokogawaElectric’ssalesofceorsalesrepresentative.
● Undernocircumstancesmaythecontentsofthismanual,inpartorinwhole,be
transcribed or copied without our permission.

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Trademarks
● Ourproductnamesorbrandnamesmentionedinthismanualarethetrademarksor
registered trademarks of Yokogawa Electric Corporation (hereinafter referred to as
YOKOGAWA).
● Microsoft,MS-DOS,Windows,WindowsXP,WindowsVista,andWindows7are
either registered trademarks or trademarks of Microsoft Corporation in the United
States and/or other countries.
● Adobe,Acrobat,andPostscriptareeitherregisteredtrademarksortrademarksof
Adobe Systems Incorporated.
● EthernetisaregisteredtrademarkofXEROXCorporationintheUnitedStates.
● ModbusisaregisteredtrademarkofSchneiderElectric.
● WedonotusetheTMor®marktoindicatethesetrademarksorregistered
trademarks in this user’s manual.
● Allotherproductnamesmentionedinthisuser’smanualaretrademarksorregistered
trademarks of their respective companies.
SafetyPrecautions
This instrument is a product of Installation Category II of IEC/EN/CSA/UL61010-1, IEC/
EN61010-2-201, IEC/EN61010-2-030 Safety Standards and Class A of EN61326-1,
EN55011 (EMC Standards).
CAUTION
This instrument is an EMC class A product. In a domestic environment, this product
may cause radio interference in which case the user needs to take adequate
measures.
The instrument is a product rated Measurement Category O (other).
* Measurement Category O (other)
This category applies to electric equipment that measures a circuit connected to a
low-voltage facility and receives power from stationary equipment such as electric
switchboards.
To use the instrument properly and safely, observe the safety precautions described in
this user’s manual when operating it. Use of the instrument in a manner not prescribed
herein may compromise protection features inherent in the device. We assume no liability
for or warranty on a fault caused by users’ failure to observe these instructions.
This instrument is designed to be used within the scope of Measurement Category O
(other) and is dedicated for indoor use.
Notes on the User’s Manual
• This user’s manual should be readily accessible to the end users so it can be referred
to easily. It should be kept in a safe place.
• Read the information contained in this manual thoroughly before operating the
product.
• The purpose of this user’s manual is not to warrant that the product is well suited to
any particular purpose, but rather to describe the functional details of the product.

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Safety,Protection,andModificationoftheProduct
The following symbols are used in the product and user’s manuals to indicate safety
precautions:
AC
AC/DC
“Handle with Care” (This symbol is attached to the part(s) of the product to
indicate that the user’s manual should be referred to in order to protect the
operator and the instrument from harm.)
The equipment wholly protected by double insulation or reinforced insulation.
Functional grounding terminal (Do not use this terminal as a protective grounding terminal.)
• In order to protect the system controlled by this product and the product itself, and
to ensure safe operation, observe the safety precautions described in this user’s
manual. Use of the instrument in a manner not prescribed herein may compromise the
product’s functions and the protection features inherent in the device. We assume no
liability for safety, or responsibility for the product’s quality, performance or functionality
should users fail to observe these instructions when operating the product.
• Installation of protection and/or safety circuits with respect to a lightning protector;
protective equipment for the system controlled by the product and the product itself;
foolproof or failsafe design of a process or line using the system controlled by the
product or the product itself; and/or the design and installation of other protective and
safety circuits are to be appropriately implemented as the customer deems necessary.
•
Be sure to use the spare parts approved by YOKOGAWA when replacing parts or consumables.
• This product is not designed or manufactured to be used in critical applications that
directly affect or threaten human lives. Such applications include nuclear power
equipment, devices using radioactivity, railway facilities, aviation equipment, air
navigation facilities, aviation facilities, and medical equipment. If so used, it is the
user’s responsibility to include in the system additional equipment and devices that
ensure personnel safety.
• Modicationoftheproductisstrictlyprohibited.
• This product is intended to be handled by skilled/trained personnel for electric devices.
• This product is UL Recognized Component. In order to comply with UL standards,
end-products are necessary to be designed by those who have knowledge of the
requirements.
 WARNING
● PowerSupply
Ensure that the instrument’s supply voltage matches the voltage of the power
supply before turning ON the power.
● DoNotUseinanExplosiveAtmosphere
Do not operate the instrument in locations with combustible or explosive gases
or steam. Operation in such environments constitutes an extreme safety hazard.
Use of the instrument in environments with high concentrations of corrosive gas
(H2S, SOX, etc.) for extended periods of time may cause a failure.
● DoNotRemoveInternalUnit
The internal unit should not be removed by anyone other than YOKOGAWA’s
service personnel. There are dangerous high voltage parts inside. Additionally,
do not replace the fuse by yourself.
● DamagetotheProtectiveConstruction
Operation of the instrument in a manner not specified in this user’s manual may
damage its protective construction.

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Warning and Disclaimer
• YOKOGAWA makes no warranties regarding the product except those stated in the
WARRANTY that is provided separately.
• The product is provided on an “as is” basis. YOKOGAWA assumes no liability to any
person or entity for any loss or damage, direct or indirect, arising from the use of the
product or from any unpredictable defect of the product.
NotesonSoftware
• YOKOGAWA makes no warranties, either expressed or implied, with respect to the
software’smerchantabilityorsuitabilityforanyparticularpurpose,exceptasspecied
in the terms of the separately provided warranty.
• Thissoftwaremaybeusedononespecicmachineonly.
• To use the software on another machine, the software must be purchased again
separately.
• It is strictly prohibited to reproduce the product except for backup purposes.
• Store the software CD-ROM (the original medium) in a safe place.
• All reverse-engineering operations, such as reverse compilation or the reverse
assembly of the product are strictly prohibited.
• No part of the product’s software may be transferred, converted, or sublet for use by
any third party, without prior written consent from YOKOGAWA.
HandlingPrecautionsfortheMainUnit
• The instrument comprises many plastic components. To clean it, wipe it with a soft,
dry cloth. Do not use organic solvents such as benzene or thinner for cleaning, as
discoloration or deformation may result.
• Keepelectricallychargedobjectsawayfromthesignalterminals.Notdoingsomay
cause the instrument to fail.
• Do not apply volatile chemicals to the display area, operation keys, etc. Do not leave
theinstrumentincontactwithrubberorPVCproductsforextendedperiods.Doingso
may result in failure.
• If the equipment emits smoke or abnormal smells or makes unusual noises, turn OFF
the instrument’s power immediately and unplug the device. In such an event, contact
your sales representative.
CheckingtheContentsofthePackage
Unpack the box and check the contents before using the product. If the product is
different from that which you have ordered, if any parts or accessories are missing, or if
the product appears to be damaged, contact your sales representative.
UT35A-L Main Unit
The UT35A-L main units have nameplates affixed to the side of the case.
Check the model and suffix codes inscribed on the nameplate to confirm that the product
received is that which was ordered.
No. (Instrument number)
When contacting your sales representative, inform them of this number, too.

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ModelandSuffixCodesofUT35A-L
Model Suffixcode
Optional
suffix
code
Description
UT35A Digital Indicating Controller (provided with retransmission output, 2 DIs,
and3DOs)(Powersupply:100-240VAC)
Type 1:
Basic control -L Limit control type
Type 2:
Functions 0Always “0”
Type 3:
Open networks
0None
1RS-485 communication (Max.38.4 kbps, 2-wire/4-wire)
2Ethernet communication (with serial gateway function)
Display language -1 English
Case color 0White (Light gray)
1Black (Light charcoal gray)
Fixed code -00 Always "-00"
/DC Powersupply24VAC/DC
Accessories
The product is provided with the following accessories according to the model and suffix
codes. Check that none of them are missing or damaged.
12
4
3
No. Product Name Quantity Remark
1 Brackets 2 Part number: L4502TP (For fixing the upper
and lower parts)
2 Unit label 1 Partnumber:L4502VZ
3 Tag label 1 Partnumber:L4502VE(Onlywhenordered.)
4 Operation Guide 1 A3 size, x 5 (Standard model only)

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Accessory (sold separately)
The following lists an accessory sold separately.
• LL50A Parameter Setting Software
Model Suffixcode Description
LL50A -00 Parameter Setting Software
• Terminal cover
Model: UTAP001
• Brackets
Part number L4502TP (2 pieces for fixing the upper and lower parts)
• User’s Manual (A4 size)
* User’s Manual can be downloaded from a website.

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SymbolsUsedinThisManual
Thissymbolisusedontheinstrument.Itindicatesthepossibilityofinjurytotheuseror
damage to the instrument, and signifies that the user must refer to the user’s manual for
special instructions. The same symbol is used in the user’s manual on pages that the
user needs to refer to, together with the term “WARNING” or “CAUTION.”
WARNING
Callsattentiontoactionsorconditionsthatcouldcauseseriousorfatalinjurytotheuser,
and indicates precautions that should be taken to prevent such occurrences.
CAUTION
Callsattentiontoactionsorconditionsthatcouldcauseinjurytotheuserordamageto
the instrument or property and indicates precautions that should be taken to prevent such
occurrences.
Note
Identifies important information required to operate the instrument.
Indicates related operations or explanations for the user’s reference.
[ ]
Indicates a character string displayed on the display.
SettingDisplay
Indicates a setting display and describes the keystrokes required to display the relevant
setting display.
SettingDetails
Provides the descriptions of settings.
Description
Describes restrictions etc. regarding a relevant operation.

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HowtoUseThisManual
This user’s manual is organized into Chapters 1 to 18 as shown below.
Chapter Title and Description
1Introduction to Functions
Describes the main functions of the UT35A-L.
2UT35A-L Operating Procedures
Describes the flow from unpacking to regular operations.
3Part Names
Describes part names and functions on the front panel.
4Basic Operation
Describes basic operation of the UT35A-L.
5QuickSettingFunction
Describes the minimum necessary settings for operation.
6MonitoringandControlofRegularOperations
Describes monitoring displays of regular operations and operation.
7Input (PV) Functions
DescribesPVinput.
8Function Block Diagram
Provides function block diagrams.
9AuxiliaryControlFunctions
Describes auxiliary control functions
10 Retransmission Output Functions
Describes output functions.
11 Alarm Functions
Describes alarm output and status output.
12 Contact Input Functions
Describes contact input functions.
13 Display,Key,andSecurityFunctions
Describes display, user function key and security functions.
14 Parameter Initialization
Describes the initialization to factory default values and to user default values.
15
PowerFailureRecoveryProcessing/PowerFrequencySetting/OtherSettings
Describes operations performed after momentary power interruption and power
failures.
16 Troubleshooting,Maintenance,andInspections
Describes troubleshooting, maintenance, periodic inspections, and disposal.
17 Installation and Wiring
Describes installation and wiring.
18 Parameters
Provides parameter maps.
GS Specifications
Provides the UT35A-L specifications.

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15
16
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18
App
Index
Contents
Introduction............................................................................................................................i
Target Readers......................................................................................................................i
Notice ................................................................................................................................i
Trademarks .......................................................................................................................... ii
Safety Precautions ............................................................................................................... ii
Handling Precautions for the Main Unit............................................................................... iv
Checking the Contents of the Package ............................................................................... iv
Model and Suffix Codes of UT35A-L....................................................................................v
Symbols Used in This Manual............................................................................................ vii
How to Use This Manual ................................................................................................... viii
Chapter 1 Introduction to Functions
1.1 Quick Setting Function ..................................................................................................... 1-1
1.2 Input/Output Functions ..................................................................................................... 1-2
1.3 Limit Control Functions..................................................................................................... 1-3
1.4 Display and Key Functions............................................................................................... 1-5
1.5 Communication Functions................................................................................................ 1-6
1.6 Definition of Main Symbols and Terms ............................................................................. 1-8
Chapter 2 UT35A-L Operating Procedures
2.1 UT35A-L Operating Procedures ....................................................................................... 2-1
Chapter 3 Part Names
3.1 Names and Functions of Display Parts ............................................................................ 3-1
3.2 Names and Functions of Keys ......................................................................................... 3-2
3.3 List of Display Symbols .................................................................................................... 3-4
3.4 Brief Description of Setting Details (Parameters)............................................................. 3-6
Chapter 4 Basic Operation
4.1 Overview of Display Switch and Operation Keys ............................................................. 4-1
4.2 How to Set Parameters .................................................................................................... 4-4
Chapter5QuickSettingFunction
5.1 Setting Using Quick Setting Function............................................................................... 5-1
5.2 Restarting Quick Setting Function.................................................................................... 5-6
Chapter6MonitoringandControlofRegularOperations
6.1 Monitoring and Control of Operation Displays.................................................................. 6-1
6.1.1 Operation Display Transitions............................................................................. 6-1
6.2 Setting Target Setpoint ..................................................................................................... 6-4
6.3 Setting Alarm Setpoint...................................................................................................... 6-5
6.4 Releasing On-State (Latch) of Alarm Output.................................................................... 6-6
Chapter 7 Input (PV) Functions
7.1 SettingFunctionsofPVInput........................................................................................... 7-1
7.1.1 Setting Input Type, Unit, Range, Scale, and Decimal Point Position.................. 7-1
7.1.2 Setting Burnout Detection for Input..................................................................... 7-3
7.1.3 Setting Reference Junction Compensation (RJC) or External Reference
Junction Compensation (ERJC) ......................................................................... 7-4
7.1.4 CorrectingInputValue ........................................................................................ 7-5

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Chapter 8 Function Block Diagram
8.1 Function Block Diagram ................................................................................................... 8-1
Chapter9AuxiliaryControlFunctions
9.1 Setting SP Limiter............................................................................................................. 9-1
9.2 Setting Controller Action at Power ON
(Restart Mode) ................................................................................................................. 9-2
Chapter 10 Retransmission Output Functions
10.1 Setting Retransmission Output Terminal, Type, and Scales........................................... 10-1
10.2 Changing Current Output Range.................................................................................... 10-2
Chapter 11 Alarm Functions
11.1 Setting Alarm Type ..........................................................................................................11-1
11.2 Setting Hysteresis to Alarm Operation ............................................................................11-9
11.3 Delaying Alarm Output (Alarm Delay Timer) .................................................................11-10
Chapter 12 Contact Input Functions
12.1 Setting Contact Input Function ....................................................................................... 12-1
12.1.1 Setting Contact Input Function ......................................................................... 12-1
Chapter13Display,Key,andSecurityFunctions
13.1 Setting Display Functions............................................................................................... 13-1
13.1.1 SettingActiveColorPVDisplayFunction ......................................................... 13-1
13.1.2 MaskingLeastSignificantDigitofPVDisplay .................................................. 13-4
13.1.3 Setting Economy Mode..................................................................................... 13-5
13.1.4 Selecting the Initial Operation Display that Appears at Power ON ................... 13-5
13.1.5 Setting Message Function ................................................................................ 13-6
13.1.6 Changing Guide Scroll Speed .......................................................................... 13-7
13.1.7 Turning Guide Display ON/OFF........................................................................ 13-7
13.1.8 Setting Automatic Return to Operation Display ................................................ 13-7
13.1.9 SettingBrightnessandContrastAdjustmentofLCDandDisplayUpdateCycle......
13-8
13.2 Assigning Function to User Function Key ...................................................................... 13-9
13.3 Setting Security Functions............................................................................................ 13-10
13.3.1 Setting a Password......................................................................................... 13-10
13.3.2 Setting Parameter Display Level .................................................................... 13-10
13.3.3 Locking (Hiding) Parameter Menu Display ......................................................13-11
13.3.4 Key Lock ......................................................................................................... 13-12
13.3.5 Prohibiting Writing via Communication ........................................................... 13-12
13.4 ConfirmationofKeyandI/OConditionandVersion..................................................... 13-13
13.4.1 Confirmation of Key and I/O Condition ........................................................... 13-13
13.4.2 ConfirmationofVersion .................................................................................. 13-15
Chapter 14 Parameter Initialization
14.1 InitializingParameterSettingstoFactoryDefaultValues............................................... 14-1
14.2 RegisteringandInitializingUserDefaultValues............................................................. 14-2
14.2.1 RegisteringasUserSetting(Default)Values.................................................... 14-2
14.2.2 InitializingtoUserSetting(Default)Values....................................................... 14-2
Contents

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5
6
7
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9
10
11
12
13
14
15
16
17
18
App
Index
Chapter15PowerFailureRecoveryProcessing/PowerFrequencySetting /
OtherSettings
15.1 Remedies if Power Failure Occurs during Operations ................................................... 15-1
15.2 Power Frequency Setting ............................................................................................... 15-2
Chapter16Troubleshooting,Maintenance,andInspections
16.1 Troubleshooting.............................................................................................................. 16-1
16.1.1 Troubleshooting Flowchart................................................................................ 16-1
16.1.2 Errors at Power On ........................................................................................... 16-2
16.1.3 Errors during Operation .................................................................................... 16-3
16.2 Maintenance................................................................................................................... 16-7
16.2.1 Cleaning............................................................................................................ 16-7
16.2.2 Packaging when Shipping the Product for Repair ............................................ 16-7
16.2.3 Replacing Parts ................................................................................................ 16-7
16.3 Periodic Maintenance .................................................................................................... 16-8
16.4 Disposal.......................................................................................................................... 16-9
Chapter 17 Installation and Wiring
17.1 Installation Location........................................................................................................ 17-1
17.2 Mounting Method............................................................................................................ 17-3
17.3 External Dimensions and Panel Cutout Dimensions...................................................... 17-4
17.4 Wiring ............................................................................................................................. 17-5
17.4.1 Important Information on Wiring ....................................................................... 17-5
17.4.2 PVInputWiring................................................................................................. 17-7
17.4.3 Limit Control Output (Relay) Wiring .................................................................. 17-8
17.4.4 Contact Input Wiring ......................................................................................... 17-9
17.4.5 Contact Output Wiring .................................................................................... 17-10
17.4.6 Retransmission Output Wiring ........................................................................17-11
17.4.7 RS-485 Communication Interface Wiring ....................................................... 17-12
17.4.8 Ethernet Communication Interface Wiring ...................................................... 17-13
17.4.9 Power Supply Wiring ...................................................................................... 17-15
17.5 Attaching and Detaching Terminal Cover ..................................................................... 17-16
Chapter 18 Parameters
18.1 Parameter Map............................................................................................................... 18-1
18.2 List of Parameters .......................................................................................................... 18-6
18.2.1 Operation Parameters ...................................................................................... 18-6
18.2.2 Setup Parameters............................................................................................. 18-8
AppendixInputandOutputTable ...............................................................................
Appendix 1 Input and Output Table..........................................................................................App-1
RevisionInformation
Contents

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Introduction to Functions
1
1.1 QuickSettingFunction
The Quick setting function is a function to easily set the basic function of the controller.
Q: What should I do to perform operate immediately?
First, I want to set the input and output.
A: Use the Quick setting function to perform the
setup easily.
Quick setting function: Chapter 5
Check the contents.
Installation and Wiring: Chapter 17
Install and wire a controller, and then turn on the power.
Buy and
Unpacking
Installation
and Wiring
Setup
Operation
Chapter 1 Introduction to Functions

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1.2 Input/Output Functions
PVInput(equippedasstandard)
PVinputisauniversalinputtoarbitrarilysetthetypeandrangeforthethermocouple(TC),
resistance-temperature detector (RTD), and DC voltage/current.
► Chapter7Input(PV)Functions
Current
Relay contact
TC
mV
V
mA
RTD
Retransmission Output
RetransmissionoutputoutputsaPVinputvalue(PV),targetsetpoint(SP),andthelike
as an analog signal to, for example, the recorder.
► Chapter10RetransmissionOutputFunctions
Current
External device such as recorder etc.
UT35A-L
Contact Input
Two contact inputs are incorporated in UT35A-L.
► Chapter12ContactInputFunctions
Contact Output
Three contact outputs are incorporated in UT35A-L. Contact output can output events
such as alarms.
For details, see the table of Model and Suffix Codes.
► Chapter11AlarmFunctions

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Introduction to Functions
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1.3 Limit Control Functions
InCaseofHighLimitControl
WhenPVexceedsasetpoint(SP),"EXCEEDED"lamplights,and"OUT"lampturnsON
(point A). The limit control output relay is de-energized then.
"EXCEEDED"lampturnsoffwhenPVgoesintonormalcondition,while"OUT"lamp
stays on as it is (point B). "OUT" lamp turns off when a confirming operation is done by
an operator (point C). The way to confirm is pushing the "RST" key (or by an exeternal
contact, according to the setting of setup parameter CNF). The confirming operation
isnotacceptedduringPVexceedsSP(pointD).Stateofoutputrelayisdeenergized
whenever "OUT" lamp is on. (NC terminal: CLOSE, NO terminal: OPEN)
SP
PV
(A)
Confirmation
(accepted)
Hysteresis
EXCEEDED Lamp
OUT Lamp
Output Relay
Operation
(RST key or external contact input)
(B) (C) (A) (D) (B)
Confirmation
(not accepted)
lit
lit lit
lit
on on
off
off
off off
off
off off
InCaseofLowLimitControl
WhenPVexceedsasetpoint(SP),“EXCEEDED”lamplights,and“OUT”lampturnsON
(point A). The limit control output relay is de-energized then.
“EXCEEDED”lampturnsoffwhenPVgoesintonormalcondition,while“OUT”lamp
stays on as it is (point B). “OUT” lamp turns off when a confirming operation is done by
an operator (point C). The way to confirm is pushing the “RST” key (or by an exeternal
contact, according to the setting of setup parameter CNF). The confirming operation
isnotacceptedduringPVexceedsSP(pointD).Stateofoutputrelayisdeenergized
whenever “OUT” lamp is on. (NC terminal: CLOSE, NO terminal: OPEN)
SP
PV
(A)
Confirmation
(accepted)
Hysteresis
EXCEEDED Lamp
OUT Lamp
Output Relay
Operation
(RST key or external contact input)
(B) (C) (A) (D) (B)
Confirmation
(not accepted)
lit
lit
on
off
off
lit
off off
lit
off
off on off

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PoweronStatus
The state of output relay at power-on can be set by a setup parameter restart mode R.MD.
Restart mode R.MD:
0: Limit output relay is de-energized at power on.
1: Limit output relay is energized at power on.
When parameter R.MD is set to 0.
Thelimitoutputrelayisalwaysde-energizedatpoweron,evenifPVdoesn’texceed
SP (point A). (NC terminal: CLOSE, NO terminal: OPEN). “OUT” lamp is lit. After the
confirmation, state of output relay is energized (NC terminal: OPEN, NO terminal:
CLOSE)and“OUT”lampturnsoff,ifthePVdoesn’texceedSP(pointB).
lit
lit lit
on on
off
off off off
off off
SP
PV
Confirmation
(accepted)
Hysteresis
EXCEEDED Lamp
OUT Lamp
Output Relay
Operation
(RST key or
external contact input)
Confirmation
(accepted)
Power on
(A) (B)
In Case of High Limit Control
When parameter R.MD is set to 1.
The limit output relay is always energized at power on (point A) (NC terminal: OPEN, NO
terminal:CLOSE)and“OUT”lampisoff,exceptwhenPVexceedsSPatpoweron.
lit
lit
on on
off
off off
offoff
SP
PV
Hysteresis
EXCEEDED Lamp
OUT Lamp
Output Relay
Operation
(RST key or
external contact input)
(A)
Confirmation
(accepted)
Power on
In Case of High Limit Control
1.3 Limit Control Functions

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1.4 DisplayandKeyFunctions
Employing a 14-segment, active color LCD greatly increases the monitoring and
operating capabilities.
Active Color PV Display (display color change)
TheactivecolorPVdisplayfunctionchangesthePVdisplaycolor(redorwhite)when
abnormalityoccursinPVetc.
► 13.1.1SettingActiveColorPVDisplayFunction
Normal Abnormal
GuideDisplay
TheguideisdisplayedonPVdisplaywhensettingparameters.Thisguidecanbeturned
on/off with the Fn key.
The scrolling guide is displayed
when setting parameters.
Parameter Display Level
To intended use of the operator, the display level of the parameter can be set.
► Chapter18Parameters
UserFunctionKeys
The UT35A-L has user function keys (F1, F2, and Fn).
Assign a function to a user function key to use it as an exclusive key.
► 13.2AssigningFunctiontoUserFunctionKey