Yokogawa UT350L Data sheet

<<Contents>> <<Index>>

General
Specifications

Model UT350L
Limit Controller

GS 05D01D21-01E

■Overview

The UT350L is an FM approved limit controller that can be
configured either as a high limit or as a low limit controller
by a user.

The UT350L features universal input, two alarm outputs,
retransmission output, a timer to count the total time the
setpoint is exceeded, and a register to retain the maximum
temperature reached.

The RS485 communication interface is available optionally.

■Features

• The large LED display of measured value whose character
is 20mm in height allows the good readability.

• Universal input is provided. The input type can be set and
changed easily by software.

• Retransmission function is included in the standard
features.

UT350L

SP

12

12

■Function Specifications

Limit Control Function

Setpoint : 1
Control type : high limit or low limit
Limit action : latching

When measured value (PV) exceeds the setpoint(SP), both
the “Exceeded” lamp and “OUT” lamp turn on.(1)
“Exceeded” lamp turns off when PV goes into normal
status, however, “OUT” lamp remains lit.(2)
“OUT” lamp turns off when the confirmation is done with
pressing the “RESEST” key by the operator.(3)
The confirmation(RESET) is not allowed while PV
exceeds SP.(4)

■State of Output Relay

State of output relay is de-energized whenever OUT lamp
is lit. When PV has not exceeded SP since power-on, state
of output relay is de-energized. (NC terminal : CLOSE,
NO terminal : OPEN) and after confirmation is done, the
state of output relay is energized. (NC terminal : OPEN,
NO terminal : CLOSE)
It is also possible to make the relay energized immediately
after power-on by the software setting.
At power-off, the relay is de-energized (NC terminal :
CLOSE, NO terminal : OPEN).

Control parameter setting range:

ON/OFF hysteresis band : 0.0 to 100.0 of instrument range
width.

Resrart mode:

Relay status at power-on can be selected.

EXCEEDED

Lamp

OUT

Lamp

PV

EXCEEDED

Lamp

OUT

Lamp

PV

SP

power off

power on

&

not over temp

(Settable as off, either)

3

(not accepted)

1

243

confir-

mation

43

confirmation

confirmation

(not accepted)

confirmationconfirmation

lit

off

lit

off

confir-

mation

lit

off

lit

off

GS 05D01D21-01E

© Copyright Apr. 1996 (YK)

4th Edition Apr. 2007 (KP)

<<Contents>> <<Index>>

2

● Signal Computation Function

Measured input computation:

Bias addition (-100.0 to 100.0 % of measured input
range width), and first-order lag filter (time constant off
or 1 to 120 s)

Contact input function:

Limit output confirmation

● Alarm Function

Types of alarm functions are provided. The alarm status is
indicated by the alarm lamp on the front panel. Also, two
points among them can be output as relay contact outputs.
Alarm types:

PV high limit, PV low limit, Deviation high limit,
Deviation low limit, De-energized on deviation high
limit, De-energized on deviation low limit, Deviation
high and low limits, Deviation within high and low
limits, De-energized on PV high limit,

De-energized on PV low limit.
Alarm output: 2 points.
Setting ranges for PV alarm and deviation alarm:

PV alarm: -100.0 to 100.0% of measured input range
Deviation alarm: -100.0 to 100.0% of measured input

range span

Alarm hysteresis width: 0.0 to 100.0% of measured

input range span

Waiting action:

Waiting action can be set to make PV/deviation alarm

stand-by during start-up until PV reaches the normal

region.
Fault diagnostic alarm:

Input burnout, A/D conversion error, thermocouple

reference junction compensation error.
FAIL output:

Software failure and/or hardware failure.
When in fail, retransmission output and alarm output
become 0% or OFF.

● Display and Operation Function

PV display:

In 4-digit digital display of engineering unit

Setpoint display:

Various data, such as the setpoint (SP), are displayed
by selection on the 4-digit digital display.

Status indicating lamps:

2 alarm indicator lamps: AL1, AL2

Exceeded lamp: Lit when PV exceeds SP

Output status lamp: Lit when output relay is de-

energized.

Operation keys:

▲ and ▼ keys: Increase or decrease setpoints and

various parameters.

SET/ENT key: For data setting or call-up/selection of

various parameters.

RESET key: Confirms the limit status and resets the

output.

Security function:

An operation-inhibiting mode using a password is

provided.

■Communication Specifications (op-

tional)

This controller has a communication function and can be
connected to a personal computer, programmable
controllers or other GREEN Series controllers.
Communication protocol:

Computer link communication: Communication protocol

with a personal computer.

Ladder communication: Communication protocol with

programmable controller.

Communication interface:

Communication protocol: Computer link or ladder

communication
Standards: EIA RS485
Maximum number of connectable controllers: 31

GREEN Series controllers
Maximum communication distance: 1,200 m
Communication method: Two-wire half duplex or four-

wire half duplex, start-stop synchronization,

non-procedural.
Communication rate: 600, 1200, 2400, 4800, 9600 bps

■Hardware Specifications

● PV Input Signal

Number of input points : 1
Input system:

The types of input/measurement ranges can be set

using software from a list of inputs.
Types of inputs, measurement ranges and measurement
accuracy: Refer to the table on page 4.
Burnout detection:

Functions with a thermocouple (TC), RTD, standard
signal 0.4 to 2 V, and 1 to 5 V.
Can be specified as upscale, downscale, and off. For

standard signal, judged as burnout at 0.1 V or less.
Input bias current : 0.05 µA (for TC/RTD)
Input resistance:

1 MΩ or more for TC/mV
About 1 MΩ for DC voltage input

Allowable signal source resistance:

250 Ω or less; effect of permissible signal source

resistance 0.1 µV/Ω or less for TC/mV

2 k Ω or less; effect of permissible signal source

resistance 0.01%/100 Ω or less for DC
voltage

Allowable leadwire resistance:

Max. of 150 Ω/wire (resistance in each of three wires

must be equal) for RTD.

However, 10 Ω/wire in the range of -150.0 to 150.0°C.
Effect of permissibe leadwire resistance:

0.1°C/10 Ω or less

Allowable input voltage:

± 10 V DC for TC/mV/RTD
± 20 V DC for DC voltage

Noise rejection ratio:

Normal mode 40 dB (50/60 Hz) or more
Common mode 120 dB (50/60 Hz) or more

Reference-junction compensation error:

± 1.0°C (15 to 35°C), ± 1.5°C (0 to 15°C, 35 to 50°C)
Applicable standards : JIS, IEC, or DIN for TC and RTD
Response time: 2 second or less, 63% (10 - 90%)

(The time required for transmission output to reach
63% of the maximum excursion when PV abruptly
changes from 10% to 90%)

All Rights Reserved. Copyright © 1996, Yokogawa Electric Corporation

GS 05D01D21-01E 4th Edition Apr. 02, 2007-00

<<Contents>> <<Index>>

3

Retransmission Output

Either PV or target setpoint is output.

Number of output points: 1
Output signal: 4 to 20 mA DC
Load resistance: 600 Ω or less
Output accuracy: ± 0.3% of span

Control Output

The control output is a relay output.

Number of output points : 1
Output signal: Three terminals for NC, NO, and

Common transfer-contacts

Contact rating: 250 V AC, 3 A or 30 V DC, 3A (resistive

load)

Resolution: 10 ms

Contact Input

Usage: Confirmation of limit output
Number of input points: 1
Input type: Voltage-free contact input or transistor contact

input
Input contact rating: 12 V DC, 10 mA or more
On/off determination:

For contact input,

ON = contact resistance of 1 kΩ or less,
OFF = contact resistance of 20 kΩ or more.

For transistor contact input,

ON = 2 V or less,
OFF = leakage current of 100 µA or less.

Minimum retention time for status detection: 1 s

Contact Output

Usage: Alarm output and FAIL output
Number of relay contact output points: 2
Relay contact rating: 240 V AC, 1 A or 30 V DC, 1 A

● Display Specifications

PV display: 4-digit, 7-segment red LED; character height -

20 mm
Setpoint display: 4-digit, 7-segment red LED; character

height - 9.3 mm
Status indicating lamps : LEDs

● Conformance to Safety and EMC Standards

Safety: Complies with IEC/EN61010-1 (CE), approved by

C22.2 No.61010-1, approved by UL508.
Certified for FM-3810 and FM-3545.
Installation category : CAT. II
Pollution degree : 2 (IEC/EN61010-1, C22.2
No.61010-1)
Measurement category : I (CAT. I : IEC/
EN61010-1)
Rated measurement input voltage : 10V DC
max.(across terminals), 300V AC max.(across
ground)
Rated transient overvoltage : 1500V (Note)
Note : It is a value on the safety standard
which is assumed by IEC/EN61010-1 in
Measurement category I, and is not the value
which guarantees an apparatus performance.

EMC standards:Complies with EN61326, EN61000-3-2,

EN61000-3-3 and EN55011 (CE).
Class A Group 1.
During test, the controller continues to operate
with the measurement accuracy within ±20%
of the range.

● Construction, Mounting, and Wiring

Construction: Front panel drip-proof (IP55 compatible)
Material: ABS resin and polycarbonate
Case color: Black
Weight: Approx. 1 kg or less
External dimensions: 96 (width) x 96 (height) x 100

Mounting: Direct panel mounting; mounting bracket, one

Panel cutout dimensions:

Mounting attitude: Up to 30 degrees above the horizontal.

Wiring: M3.5 (ISO 3.5 mm) screw terminals (signal wiring

(depth) mm

each for upper and lower mounting

92

+0.8

(width) x

0

92

+0.8

0

mm

No downward tilting allowed.

and power/ground wiring as well)

(height)

Status lamps

Alarm(AL1, 2), EXCEEDED,
OUT

LED display unit (for PV)

Displays PV, and error code when
error is detected.

LED display unit (for SP)

Displays setpoint (SP) and setting
item/value of parameters.

Operational keys

Increase/Decrease the setting data (▲,▼ )
Select parameter/Enter the setting data (SET/ENT)
Confirm and reset the output (RESET)

All Rights Reserved. Copyright © 1996, Yokogawa Electric Corporation GS 05D01D21-01E 4th Edition Apr. 02, 2007-00

<<Contents>> <<Index>>

4

● Power Supply Specifications and Isolation

Power supply: Rated at 100 to 240 V AC (±10%), 50/60

Hz
Power consumption: Max. 20 VA (Max. 8.0 W)
Memory back-up: Non-volatile memory.
Withstanding voltage:

1500 V AC for 1 minute between primary and

secondary terminals.

1500 V AC for 1 minute between primary and ground

terminals.

1500 V AC for 1 minute between ground and second-

ary terminals.

500VAC for 1minute between two secondary termi-

nals.

Primary terminals = power and relay output terminals
Secondary terminals = Analog I/O signal terminals,

contact input terminals.

Insulation resistance: 20 MΩ or more when 500 V DC

voltage is applied between the power

terminals and ground terminal.
Grounding: Class D grounding (grounding resistance of

100 Ω or less)

Isolation specifications

Measured input terminal: Isolated from other I/O

terminals. Not isolated from internal
circuits.

Analog 4 to 20 mA output (retransmission) terminal:

Isolated from other I/O terminals and
internal circuits.

Relay contact control output terminals: Isolated from

other contact output terminals, other I/O
terminals and internal circuits.

Contact input terminals: Not isolated from other contact

input terminals, and communication
terminals. Isolated from other I/O terminals
and internal circuits.

Relay contact output terminals: Not isolated from other

relay contact output terminals. Isolated from
other I/O terminals and internal circuits.

RS-485 communication terminals: Not isolated from

contact input terminals. Isolated from other
I/O terminals and internal circuits.

Power supply terminals: Isolated from other I/O

terminals, ground terminal, and internal
circuits.

Ground terminal: Isolated from other I/O terminals,

power terminals, and internal circuits.

Thermocouple

RTD

Standard
signal
DC voltage

Input type

K

J

T

B

S
R
N
E
L (DIN)

U (DIN)

W (DIN)
Platinel 2
PR20-40

W97Re3-W75Re25
JPt100

Pt100

0.4 to 2V
1 to 5V
0 to 2V
0 to 10V

-10 to 20mV
0 to 100mV

Input range

code

1
2
3
4
5
6

7

8

9
10
11
12
13
14
15
16

17

18
30
31
35
36
37
40
41
50
51
55
56

Instrument range (˚C) Instrument range (˚F) Measurement accuracy

-200 to 1370˚C

-199.9 to 999.9˚C

-199.9 to 500.0˚C

-199.9 to 999.9˚C

-199.9 to 400.0˚C

0.0 to 400.0˚C
0 to 1800˚C

0 to 1700˚C
0 to 1700˚C

-200 to 1300˚C

-199.9 to 999.9˚C

-199.9 to 900.0˚C

-199.9 to 400.0˚C

0.0 to 400.0˚C
0 to 2300˚C
0 to 1390˚C
0 to 1900˚C

0 to 2000˚C

-199.9 to 500.0˚C

-150.0 to 150.0˚C

-199.9 to 640.0˚C

-199.9 to 500.0˚C

-150.0 to 150.0˚C

0.400 to 2.000

1.000 to 5.000

0.000 to 2.000

0.00 to10.00

-10.00 to 20.00

0.0 to 100.0

Scaling is enable in the following
4 range.

-1999 to 9999

-199.9 to 999.9

-19.99 to 99.99

-1.999 to 9.999

-300 to 2500˚F
0 to 2300˚F

-199.9 to 999.9˚F

-300 to 2300˚F

-300 to 750˚F

-199.9 to 750.0˚F
32 to 3300˚F

32 to 3100˚F
32 to 3100˚F

-300 to 2400˚F

-300 to 1800˚F

-300 to 1300˚F

-300 to 750˚F

-199.9 to 750.0˚F
32 to 4200˚F
32 to 2500˚F
32 to 3400˚F

32 to 3600˚F

-199.9 to 999.9˚F

-199.9 to 300.0˚F

-300 to 1180˚F

-199.9 to 999.9˚F

-199.9 to 300.0˚F

At or above 0˚C, ±0.1% ±1 digit of F.S.
Below 0˚C, ±0.2% ±1 digit of F.S.

At or above 400˚C, ±0.15% ±1 digit of F.S.
Below 400˚C, ±5% ±1 digit of F.S.

±0.15% ±1 digit of F.S.

±0.1% ±1 digit of F.S.

At or above 0˚C, ±0.1% ±1 digit of F.S.
Below 0˚C, ±0.2% ±1 digit of F.S.

±0.2% ±1 digit of F.S.
±0.1% ±1 digit of F.S.

At or above 800˚C, ±0.5% ±1 digit of F.S.
Below 800˚C, not guaranteed

±0.2% ±1 digit of F.S.
±0.1% ±1 digit of F.S.
±0.2% ±1 digit of F.S.
±0.1% ±1 digit of F.S.

±0.2% ±1 digit of F.S.
±0.1% ±1 digit of F.S.

All Rights Reserved. Copyright © 1996, Yokogawa Electric Corporation

GS 05D01D21-01E 4th Edition Apr. 02, 2007-00

<<Contents>> <<Index>>

● Environmental Conditions

Normal operating conditions:

Ambient temperature: 0 to 50°C (40°C or less for

Temperature fluctuation: Max. 10°C/h
Ambient humidity: 20 to 90% RH (no condensation)
Magnetic field: 400 A/m or less
Continuous vibration (5 to 14 Hz): Peak-to-peak

Continuous vibration (14 to 150 Hz): 4.9 m/s

Short-period vibration: 14.7 m/s
Shock: 147 m/s
Installation altitude: 2,000 m or less above sea level
Attitude for installation: Max. 30° off vertical. Do not

Installation category based on IEC61010-1: II (See

Pollution degree based on IEC61010-1: 2 (See Note.)

Note:

• The “Installation category” implies the regulation for
impulse withstand voltage. It is also called the “Overvolt­age category.” “II” applies to electrical equipment.

• “Pollution level” describes the degree to which a solid,
liquid or gas which deteriorates dielectric strength is
adhering. “2” applies to a normal indoor atmosphere.

mounting of instruments side-by-side)

amplitude of 1.2 mm or less

less

2

(15G) or less, 11 ms

2

(1.5G), 15s or less

2

(0.5G) or

install upside-down.

Note.)

5

Transportation and storage conditions:

Temperature : -25 to 70°C
Humidity : 5 to 95% RH

Effects of operating conditions:

Effect of ambient temperature:

For voltage or TC inputs: Whichever is greater,

± 1µV/°C or ±0.01% of F.S./°C
For RTD inputs: ±0.05°C/°C or less for RTD input
For analog output: ±0.05% of F.S./°C or less

Effect of power supply fluctuation (within rated voltage

range):

For analog input: Equal to or less than whichever is

greater, ± 1 µV/10 V or

± 0.01% of F.S./10 V
For analog output: ±0.05% of F.S./10 V or less

All Rights Reserved. Copyright © 1996, Yokogawa Electric Corporation GS 05D01D21-01E 4th Edition Apr. 02, 2007-00

<<Contents>> <<Index>>

1

2

Relay contact output

3

Limit control output

NC

NO

COM

Contact rating: 250 V AC, 3 A

30 V DC, 3 A (resistance load)

23

24

RS-485 communication

* Wiring can only be carried out

for controllers with

communication functions.

Maximum baud rate: 9600 bps

25

26

27

SDB(+)

SDA(-)

RDB(+)

RDA(-)

SG

12

13

TC input

11

12

RTD input

13

12

13

mV/V input

A

b

B

-

+

-

+

12

13

Note: Connecting a 250

 resistor to the terminals is

optional.

Model: X010-250-2 (resistor with M3.5 crimp-on terminal

lugs)

*

When receiving 4-20 mA DC current signals,

set the PV input type to 1-5 V DC (setpoint “41”).

䊏

Receiving 4-20 mA DC Current

Signals with the Controller

250 

4-20mA

PV input

Confirmation of limit status

-

+

16

17

Retransmission output

4-20 mA DC

* PV retransmission is configured at factory

before shipment.

Load resistance: 600

 or less

-

+

6

Alarm output

5

7

AL1

AL2

COM

Relay contact rating: 240 V AC, 1 A

30 V DC, 1 A (resistance load)

Relay

Alarm-1 output

Alarm-2 output

Common

UT

8

9

Power supply

10

L

N

Allowable range: 100 to 240 V AC (

10%)

(free voltage)

50/60 Hz shared

Power supply

CAUTION

Before carrying out wiring, turn off the power to

the controller and check that cables to be connected

are not alive with a tester or the like because

there is a possibility of electric shock.

Contact rating: 12 V DC, 10 mA or more

External contact input

DI

COM

Common

RESET when DI=ON

(However, setup parameter

DIS=DI)

DI

COM

+5V

Contact

Transistor contact

19

20

UT

19

20

21

23

24

25

26

27

30

11

12

13

14

15

16

17

18

19

20

1

2

3

4

5

6

7

8

9

10

6

■Terminal Wiring Diagrams

All Rights Reserved. Copyright © 1996, Yokogawa Electric Corporation

GS 05D01D21-01E 4th Edition Apr. 02, 2007-00

<<Contents>> <<Index>>

■External Dimensions and Penel Cutout Dimensions

7

Unit: mm

96

96

11

100

Large bracket

91.8

Small bracket

1 to 10 mm (Panel thickness)

General installation Side-by-side close installation

[(N-1)96+92]117 min.

0

+0.8

92

(53)

145 min.

"N" stands for the number of controllers to be
installed.

92

+0.8

0

However, the measured value applies if N  5.

112

+0.8

0

92

+0.8

0

(25)

Normal Allowable Deviation=± (Value of JIS B 0401-1999 tolerance grade IT18) /2

■Model and Suffix Codes

Model Suffix code Description

UT350L
Type

Optional functions

Standard Accessories: User’s manual, mounting bracket

-0
0
1

Limit controller
Standard type
None
With communication

■Items to be Specified when Ordering

Model and suffix codes

All Rights Reserved. Copyright © 1996, Yokogawa Electric Corporation GS 05D01D21-01E 4th Edition Apr. 02, 2007-00