M-system LWT Manual de usuario

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN

Phone: +81(6)6659-8201 Fax:

+81(6)6659-8510 E-mail: info@m-system.co.jp

EM-1975 Rev.4 P. 1 / 3

INSTRUCTION MANUAL

WATT TRANSDUCER

(with pulse output) MODEL LWT

BEFORE USE ....

Thank you for choosing M-System. Before use, please check

contents of the package you received as outlined below.

If you have any problems or questions with the product,

please contact M-System’s Sales Ofﬁce or representatives.

■PACKAGE INCLUDES:

Signal conditioner ...............................................................(1)

■MODEL NO.

Conﬁrm Model No. marking on the product to be exactly

what you ordered.

■INSTRUCTION MANUAL

This manual describes necessary points of caution when

you use this product, including installation, connection and

basic maintenance procedures.

POINTS OF CAUTION

■AUXILIARY POWER INPUT RATING & OPERATIONAL

RANGE

•Locate the auxiliary power input rating marked on the

product and conﬁrm its operational range as indicated

below:

AC power: Rating -15/+10%, 50/60 Hz, approx. 2 VA

DC power: Rating ±10%, approx. 2 W

or 85 – 150 V, approx. 2 W for 110 V rating

■GENERAL PRECAUTIONS

•Before you remove the unit or mount it, turn off the power

supply and input signal for safety.

■ENVIRONMENT

•Indoor use.

•When heavy dust or metal particles are present in the

air, install the unit inside proper housing with sufﬁcient

ventilation.

•Do not install the unit where it is subjected to continuous

vibration. Do not subject the unit to physical impact.

•Environmental temperature must be within -10 to +55°C

(14 to 131°F) with relative humidity within 30 to 85% RH

in order to ensure adequate life span and operation.

■WIRING

•Do not install cables close to noise sources (relay drive

cable, high frequency line, etc.).

•Do not bind these cables together with those in which

noises are present. Do not install them in the same duct.

■AND ....

•The unit is designed to function as soon as power is sup-

plied, however, a warm up for 10 minutes is required for

satisfying complete performance described in the data

sheet.

COMPONENT IDENTIFICATION

Zero Adj.

Specifications

Connection Diagram

Body

Span Adj.

INSTALLATION

■DIN RAIL MOUNTING

Set the unit so that its DIN rail adaptor is at the bottom.

Position the upper hook at the rear side of the unit on the

DIN rail and push in the lower. When removing the unit,

push down the DIN rail adaptor utilizing a screwdriver (–)

and pull.

DIN Rail

35mm wide

Spring Loaded

DIN Rail Adaptor

■WALL MOUNTING unit: mm (inch)

2–M5

60 (2.36)

■M5 SCREWS

2–M4

60 (2.36)

50 (1.97)

■

M4 SCREWS

LW T

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN

Phone: +81(6)6659-8201 Fax:

+81(6)6659-8510 E-mail: info@m-system.co.jp

EM-1975 Rev.4 P. 2 / 3

TERMINAL CONNECTIONS

Connect the unit as in the diagram below or refer to the connection diagram on the top of the unit.

■EXTERNAL DIMENSIONS unit: mm (inch)

112 (4.41) [3.3 (.13)]

35.4 (1.39)

DIN RAIL

35mm wide

8 (.31) M3.5 SCREW

(Only on the used terminals)

75 (2.95)

TERMINAL

COVER

2–5.8 (.23) dia. or

2–4.8 (.18) dia.

MTG HOLE

8 (.31) deep

•When mounting, no extra space is needed between units.

75 (2.95)

910111213141516

12 345678

3 (.12)1(.04)

■CONNECTION DIAGRAM

–

PULSE OUTPUT

–

DC OUTPUT

■

3-PHASE/3-WIRE

■

SINGLE-PHASE/2-WIRE

LOAD

SOURCE

P2V

P1U

FUSE VT

–

PULSE OUTPUT

■

SINGLE-PHASE/3-WIRE

–

PULSE OUTPUT

U(+)

V(–)

*This unit can be powered from the input voltage when the voltage is

sufficiently stable and meets other supply voltage requirements.

LOAD

1N23

SOURCE

P1U

FUSE VT

KKK

–

PULSE OUTPUT

U(+)

V(–)

■

3-PHASE/4-WIRE

U(+)

V(–)

–

DC OUTPUT

–

DC OUTPUT

–

DC OUTPUT

U(+)

V(–)

■

Open Collector

Pulse Output Connection Example

AUXILIARY

POWER

*AUXILIARY

POWER

AUXILIARY

POWER

AUXILIARY

POWER

LOAD

1N2

SOURCE

P0V

P1U

FUSE VT

kkk

lll

LOAD

123

SOURCE

P2V

P1U

FUSE VT

LW T

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN

Phone: +81(6)6659-8201 Fax:

+81(6)6659-8510 E-mail: info@m-system.co.jp

EM-1975 Rev.4 P. 3 / 3

■TERMINAL ASSIGNMENTS

1 2 3 4 5 6 7 8

10 11 12 13 14 15 16

WIRING INSTRUCTIONS

■SCREW TERMINAL

Torque: 0.8 N·m

CHECKING

1 ) Terminal wiring: Check that all cables are correctly

connected according to the connection diagram.

2 ) Auxiliary power input voltage: Check voltage across

terminal 9 – 10 with a multimeter.

3 ) Input: Calculate the calibration range and check that

the result is within the usable range.

Calibration Range [W] = Measuring Wattage

(VT Ratio) × (CT Ratio)

4 ) DC output: Check that the load resistance meets the

described speciﬁcations.

5 ) Pulse output: Check that the load connected to the open

collector output is within 35 V DC @ 100 mA.

ADJUSTMENT PROCEDURE

This unit is calibrated at the factory to meet the ordered

speciﬁcations, therefore you usually do not need any cali-

bration.

For matching the signal to a receiving instrument or in case

of regular calibration, adjust the output as explained in the

following.

■HOW TO CALIBRATE THE OUTPUT SIGNAL

Use a signal source and measuring instruments of sufﬁ-

cient accuracy level. Turn the auxiliary power supply on

and warm up for more than 10 minutes.

1 ) ZERO: Apply 0% input and adjust output to 0%.

2 ) SPAN: Apply 100% input and adjust output to 100%.

3 ) Check ZERO adjustment again with 0% input.

4 ) When ZERO value is changed, repeat the above proce-

dure 1) – 3).

MAINTENANCE

Regular calibration procedure is explained below:

■CALIBRATION

Warm up the unit for at least 10 minutes. Apply 0%, 25%,

50%, 75% and 100% input signal. Check that the output

signal for the respective input signal remains within accu-

racy described in the data sheet. When the output is out of

tolerance, recalibrate the unit according to the “ADJUST-

MENT PROCEDURE” explained earlier.

LIGHTNING SURGE PROTECTION

M-System offers a series of lightning surge protector for

protection against induced lightning surges. Please contact

M-System to choose appropriate models.

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