UNI-T UT321 Bedienungsanleitung PDF herunterladen (Seite 6)

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GS 05D01D12-02E 4th Edition Mar. 01, 2005-00

Allowable wiring resistance:

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

wires must be equal) for RTD input

However, max. 10 Ω/wire for the range of

–150.0 to 150.0°C.

Wiring resistance effect: ±0.1°C/10 Ω

Allowable input voltage:

±10 V DC for TC, mV or RTD input

±20 V DC for DC voltage input

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 (ITS-90) for TC and RTD

24 V DC Loop Power Supply for Sensor

Supplies power to a two-wire transmitter.

A resistor (10 to 250Ω) connected between the controller and

the transmitter converts a current signal into a voltage signal,

which is then read by the PV input terminal.

Supply voltage: 21.6 to 28.0 V DC

Maximum supply current : 30 mA (only for models with

24 V DC loop power supply)

Ambient temperature should be 0 to 40°C when using 24

V DC loop power supply for UT321.

Two-wire transmitter

Loop power

supply

21.6 to

28.0 V DC

PV input

1 to 5 V DC signal

External

resistor

(Note)

4-20 mADC

■ 24 V DC Power Supply Wiring to Two-wire Sensor

250Ω

Note: Connecting a 250

Ω

resistor to the terminals is optional.

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

Retransmission Output

Any of PV, target setpoint, or control output is output. Can

also be used for 15 V DC loop power supply.

Number of output points: 1

Output signal: 4 to 20 mA DC

Load resistance: 600 Ω or less

Output accuracy: ±0.3% of span

Performance in the standard operating

conditions (at 23± 2°C, 55± 10% RH, and 50/

60 Hz power frequency)

When used for 15 V DC loop power supply:

Supply voltage: 14.5 to 18.0 V DC

Maximum supply current : About 21 mA

(with the protection circuit at field short

circuit).

Control Outputs

The control output is of a universal scheme and can be

selected from the following types of outputs. In the case of

heating/cooling control, it is also selectable from these

outputs. However, if the cooling-side output is a relay

contact output, the alarm-3 cannot be used, and similarly if

the cooling-side output is a voltage pulse or current output,

the retransmission output (15 V DC loop power supply)

cannot be used.

Current output

Number of output points:

1 or 2 (2 for heating/cooling type)

Selected between voltage pulse output.

Output signal: 4 to 20 mA DC

Load resistance: 600 Ω or less

Output accuracy: ±0.3% of span

Performance in the standard operating

conditions (at 23± 2°C, 55± 10% RH, and

50/60 Hz power frequency)

Voltage pulse output

Number of output points:

1 or 2 (2 for heating/cooling type)

Selected between current output.

Output signal:

On voltage = 12 V DC or more (load

resistance; 600 Ω or more, current at short-

circuit; about 30 mA)

Off voltage = 0.1 V DC or less

Resolution: 10 ms

Relay contact output

Number of output points:

1 or 2 (2 for heating/cooling type)

Output signal:

At three terminals of NC, NO and Common,

transfer-contact

Contact rating:

250 V AC, 3 A or 30 V DC, 3 A (resistive

load)

Resolution: 10 ms

Contact Inputs

Usage: Target setpoint selection, Auto/Man mode

switching, or Key lock parameter show/hide

switching

Number of input points: 2

Input type: Non-voltage contact input or transistor open

collector input

Input contact rating:

12 V DC, 10 mA or more (for non-voltage

contact input)

On/off detection:

For non-voltage contact input,

ON= contact resistance; 1 kΩ or less,

OFF= contact resistance; 20 kΩ or more.

For transistor open collector input,

ON= 2 V or less,

OFF= leakage current; 100 µA or less.

Minimum retention time for status detection:

About 1 s

Contact Outputs

Usage: Alarm output, FAIL output, and others

Number of relay contact output points: 3

Relay contact rating:

240 V AC, 1 A or 30 V DC, 1 A

a-contact (COM terminals are common for

every contact output.) (b-contact for FAIL

output)

● Display Unit Specifications

PV display: 4-digit, 7-segment green/red LED; each digit

12 mm in height

Setpoint display:

4-digit, 7-segment red LED; each digit 9.3

mm in height

Status indicator lamps: LEDs

1 2 3 4 5 6 7 8 9 10 11 12

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