stallation, wiring, and other tasks required to make the controller ready for operation.
Contents
1. Safety Precautions
2. Model and Suffix Codes
3. How to Install
4. How to Connect Wires
5. Hardware Specifications
6. Terminal Wiring Diagrams
Introduction
Thank you for purchasing the UT551 digital indicating controller.
The controller is shipped from the factory with 6 hardcopy users manuals (A2 and A3 size) and 1 users manual on CD-ROM.
The 6 users manuals in hardcopy format describe the operating procedures required for basic use (factory-set to single-loop control
mode). It is recommended that you refer to these users manuals to understand [1] installation, [2] initial settings, and [3] operating
procedures of the controller.
The CD-ROM contains an Users Manual (Reference) with descriptions of various functions and setting ranges that can be set as
necessary. The manual also contains information on operations used to carry out control other than single-loop control.
Moreover, the use of an optional parameter setting tool (Model: LL100-E10) allows you to easily perform settings and adjustments with
a PC.
* Ethernet is registered trademark of XEROX Corporation.
s
How to Use the Manuals
Purpose
Manual Title
Description
Media
Setup
Installation

Describes the tasks (installation, wiring, and others) required
to make the controller ready for operations.
A2-size paper,
back and front
Basic operation
Initial Settings
Describes examples of setting PV input types, control output
types, and alarm types. Making settings described herein
allows you to carry out basic control.
A2-size paper,
back and front
Brief operation
Parameter Map
Contains the parameter map used as a guideline for setting
parameters.
A2-size paper,
back and front
Function description
and setpoint recording
Parameters
Briefly describes the functions of parameters. In addition,
each parameter table has a User Setting column, where you
can record your setpoints when setting them in the controller.
A2-size paper,
back and front
Detailed description of
functions
Users Manual
(Reference)
Explains more advanced applications than those found in
the 6 hardcopy users manuals (A2 and A3 size).
CD-ROM
Installation

Operating
procedures
and troubleshooting
Operations

Describes key operation sequences. For operation control
through external contact inputs, see the back of
Users Manual.
A2-size paper,
back and front
Basic operation of
Active Color PV Display
Setting / Explanation
of Active Color PV Display
Describes the setting/explanation of Active Color PV Display. A3-size paper,
back and front
1. Safety Precautions
The following symbol is indicated on the controller to ensure safe use.
CAUTION
This symbol on the controller indicates that the operator must refer to an explanation in the users manual in order
to avoid the risk of injury or death of personnel or damage to the instrument. The manual describes how the operator
should exercise special care to avoid electric shock or other dangers that may result in injury or loss of life.
The following symbols are used in the hardcopy users manuals and in the users manual supplied on the CD-ROM.
NOTE
Indicates that operating the hardware or software in a particular manner may damage it or result in a system failure.
IMPORTANT
Draws attention to information that is essential for understanding the operation and/or features of the controller.
s
Exemption from Responsibility
Make sure that all of the precautions are strictly adhered to. Yokogawa Electric Corporation assumes no liability for any
damage resulting from use of the instrument in contradiction to the precautions.
Also, Yokogawa Electric Corporation assumes no liability to any party for any loss or damage, direct or indirect, caused
by the use or any unpredictable defect of the instrument.
s
Regarding Protection, Safety, and Prohibition Against Unauthorized Modification
(1) In order to protect the product and the system controlled by it against damage and ensure its safe use, make certain that
all of the instructions and precautions relating to safety contained in this document are strictly adhered to. Yokogawa
does not guarantee safety if products are not handled according to these instructions.
(2) Modification of the product is strictly prohibited.
2. Model and Suffix Codes
Before using the controller, check that the model and suffix codes match your order.
Model
Suffix Code
Description
UT551
Digital indicating controller (provided with retransmission output and 15 VDC loop power supply as standard)
-0
Standard type
-1
Position proportional type
Type
A
B
C
D
Optional functions
With Ethernet communication
With Ethernet communication, auxiliary analog (remote) input, and 1 additional DI
With Ethernet communication, 5 additional DIs and 4 additional DOs
With Ethernet communication, auxiliary analog (remote) input, 6 additional DIs and
4 additional DOs
Check that the following items are provided:
Digital indicating controller (of ordered model): ........................................... 1
Brackets (mounting hardware): ...................................................................... 1 pair
Unit label: ....................................................................................................... 1
Users Manuals for Single-loop Control: ....................................................... 5 (A2 size)
Users Manuals Setting/Explanation of Active Color PV Display: ............ 1 (A3 size)
Users Manual (Reference) (CD-ROM Version): ........................................... 1
s
Correspondence between the Model and Suffix Codes, and the Contact Input/
Output Terminals Provided
Check the model ordered and the presence/absence of contact inputs and outputs in the following table.
 indicate that the contacts are available.
Contact input terminals
Contact output terminals
Model and Suffix
Codes
DI1
DI2
DI3
DI4
DI5
DI6
DI7
DO1
DO2
DO3
DO4
UT551- xB
UT551- xA
UT551- xC
UT551- xD
DI8
DO5
DO6
DO7








































Note: For details on the functions of contact inputs/outputs, see Terminal Wiring Diagrams on the back of the manual.
3. How to Install
NOTE
To install the controller, select a location where:
(1) no one may accidentally touch the terminals,
(2) mechanical vibrations are minimal,
(3) corrosive gas is minimal,
(4) temperature can be maintained at about 23
�
C and the fluctuation is minimal,
(5) no direct radiant heat is present,
(6) no magnetic disturbances are caused,
(7) no wind blows against the terminal board (reference junction compensation
element),
(8) no water is splashed,
(9) no flammable materials are around,
Never place the controller directly on flammable items or equipment.
If the controller has to be installed close to flammable items or equipment, be sure to provide shielding panels all
around the controller, at least 150mm away from every side; the panels should be made of either 1.43mm-thick
metal-plated steel plates or 1.6mm-thick uncoated steel plates.
q
Installation Position
Install the controller at an angle within 30
�
from horizontal
with the front panel facing upward. Do not install it facing
downward. The position of right and left sides should be hori-
zontal.
s
External Dimensions and Panel Cutout
Dimensions
P V
AL1
2
3
4
CAS
SET/ENT
A / M
REM
MAN
LP2
(25)
(53)
[(N-1) 96+92]
117 min.
145 min.
+0.8
0
+0.8
0
92
+0.8
0
92
+0.8
0
92
N stands for the number of controllers to be
installed.
However, the measured value applies if N

5.
100
11
UT551
General installation
Side-by-side close installation
1 to 10 mm
(Panel thickness)
Small bracket
Large bracket
91.8
112
Unit: mm
96
96
s
How to Install
CAUTION
Turn off the power to the controller before installing it on the panel because there is a possibility of electric shock.
After opening the mounting hole on the
panel, follow the procedures below to in-
stall the controller:
1.
Insert the controller into the opening
from the front of the panel so that the
terminal board on the rear is at the far
side.
2.
Set the brackets in place on the top and
bottom of the controller as shown in
the figure on the left, then tighten the
screws of the brackets. Take care not
to overtighten them.
4. How to Connect Wires
CAUTION
1)
Before carrying out wiring, turn off the power to the controller and check that the cables to be connected are not
alive with a tester or the like because there is a possibility of electric shock.
2)
For the protection and safe use of the controller, be sure to place a circuit breaker (conforms with IEC60947,
5A, 100V or 220V AC) near the controller where the breaker can easily be operated. In addition, be sure to
indicate that it is the instrument to cut the power supply of the controller.
3)
Wiring must be carried out by personnel who have basic electrical knowledge and practical experience.
NOTE
1)
Provide power from a single-phase instrument power supply. If there is a lot of noise in the power line, insert an
insulating transformer into the primary side of the line and use a line filter (recommended part: ZAC2205-00U
from TDK) on the secondary side.
As a countermeasures against noise, do not place the primary and secondary power cables close to each other.
2)
For thermocouple input, use shielded compensating lead wires for wiring. For RTD input, use shielded wires
that have low conductor resistance and cause no significant differences in resistance between the three wires.
The cables to be used for wiring, terminal specifications, and recommended parts are as shown below.
3)
Control output relays may be replaced. However,