Mitsubishi Electric EMU-CT100, EMU-CT50, EMU-CT250 Instruction Manual

CURRENT SENSOR

MODEL EMU-CT50, EMU-CT100, EMU-CT250

INSTRUCTION MANUAL

1 Safety Precautions

1.1 Precautions concerning working environment and conditions

Do not use the unit in any of the following places. Doing so may cause malfunctions or areduction in service life.

× Places where the ambient temperature exceeds the working temperature

range(−5°C to 55°C).

× Places where the humidity exceeds the humidity range (5% to 95%RH) or where

condensation occurs.

× Places with a lot of dust, corrosive gas, sal
× Places where the unit may be exposed to rain or drops of water.
× Places where metal piecesor inductive substances are laying around.

1.2 Precautions concerning preparations before using theequipment

･Use the unit in the specified usage environment and conditions.
･Check the current and voltage ratings of the equipment.

1.3 Precautions concerning installation and connection

Make sure to use the module by following cautions of this section.

1.4 Precautions concerning maintenance

1.5 Precautions concerning inspection

1.6 Precautions concerning storage

 When storing the unit, turn off power, disconnect cables and wires, and put them in vinyl bags or the like.

 When storing the unit for a long time, avoid keeping it in the places shown below.

× Places where the ambient temperature is out of the range from −10°C to 60°C. × Places where the daily average temperature exceeds 35°C.
× Places where the humidity exceeds the humidity range (5% to
× Places where metallic particles or inductive substances are laying around. × Places with a lot of dust, corrosive gas, salt or oily smoke.
× Places where the unit is exposed directly to rain, water droplets.

・

Danger

・

<Precautions concerning installation and connection>

・Any person who is involved in the installation and the wiring of this Programmable Controller should be fully competent to

do the work.

・Use an electric wire of the size of penetrating this current sensor for a primary side cable, do not use a non-insulation electric

wire or a metalfor a primary cable.

・When threading and wiring, take utmost care that cuttings and wire pieces do not enter the equipment.
・Connect the wires carefully, checking the wiring diagram. Incorrect wiring can cause unit failures, fires, and electric shocks.
・Perform wiring work with current off and do not perform live wire operations. Doing so can cause electric shocks, unit failures, and

fires.

・After tightening, be sure to check that all screws have been tightened. Failure to tighten any screw can cause unit

malfunctions, fires,and electric shocks.

・Use the M3.5 screws crimp type terminals (less than external form 7.2mm) appropriate for for which is suitable for electric

wire size (1.25mm
poor disconnection andcontact.

・UL／c-UL listed corresponds, use the wires according to the following conditions and UL-listed crimp type terminals.

Single wire：AWG24～AWG18，Stranded wire：AWG20～AWG18

・75℃ copper conductor only.

Caution

・Confirm that a terminal is closed surely. The lack of clamping causes malfunction of the machinery, a fire, the electric shock.
・Carry out the clamping of the crimp-type terminal lugs by prescribed torque (0.49 - 0.78N･m). The excessive clamping becomes

the ruination of a terminal and t

・Keep the second terminals 1cm or more away from the panel and the first conductor.
・Read the manual of measuring units which is used with this current sensor , and is used well, and follow it.
・Use this current sensor in cabinet certainly.

<To avoidgetting shock>

・As for the panel, it be assumed that it was given the following matters.

a)It is necessary to attach a key to the cabinet.
b)The structure that a power supply is intercepted automatically is necessary when opening a cabinet.

・Degrees of protection(IPcode)needs to higher than IP2X level.

<Precautions concerning usage>

・Dust or rust on the split partcan degrade the performance of the current transformer . Wipe the dirt from the surface with soft dry cloth.
・Usethe unit withinthe rated range stated here. Using the unit out ofthe rated range may cause not only malfunctions or unit failure,but

also fires orburnout.

・The secondary side of the current sensorhas a built-in protective circuit against opening of the secondary terminal. No problem occurs by

opening the terminal during wiring work. However, for safety,do not continuously apply current while the terminal is open.

･Protect the unit from a power failure. Failure to do so can cause unitfailures, fires,or electric shocks.

Caution

･Wipe off the surface dirt with tender cloth. Don’t let chemical cloths touch it for a long time, and do not wipe it with benzine or thinner.

･Perform the check in the state that does not turn on electricity by all means.Checkout the following.

a) Does not this product have the damage? b) Are not there an abnormal sound, bad-smelling fever?

Caution

c) Are not there installation, the slack of the screw?

t or oily smoke.

Perform installation, disassembly, the wiring work after intercepting a power supply by all means. There
might be the damage of anelectricshockortheproduct.( )
Do not install around non-insulated dangerous electric shock conductors that can cause electric shock,
electric burn or arc flash. ( )

2

). The use of the infelicity causes malfunction of the machinery, trouble, a damage by a fire, the fire by outbreak of the

he screw.

95%RH) . × Places with a lot of vibration or impact.

Read thismanualcarefully, and use this instrumentproperly.

●Read this manualthoroughly before using the equipment forproper handling.

●This manual should beretained for the future reference.

●Be sure that the manual isdeliveredto the end users.

× Places where the daily averagetemperature exceeds 35°C.
× Places with a lot ofvibration or impacts.
×Placesexposed to direct sunlight.
×Places where the out of the cabinet.
×Places with strong electromagnetic field or noise.

×Place where the altitude exceeds 2000

m.

1.7 Precautions concerning disposal

Dispose this productappropriately in accordance with the national or community rule.

2 Installation

●Installation

1)Open the moving core as shown Figure 1.Slowly lift the moving core locking claws on both sides of the moving core to open and removethem from the

2)After checking that the core parting faces are free from dirt, close the moving core. Push up the moving core until the stoppers are securely locked. (When the

3)Pass the tying bands into the current sensor locking holes to securethe sensor with the cable.(Figure 3)

＊For the details, see the manual for combination measurement unit.
＊Applicable wire size in the

●Connection

3 Specification

(

)

Figure 1

Primary
Cable

Movingcore
locking claw

Moving
core

Stopper

stoppers.Before inserting the cable, check the symbols K and L to fit the current sensor inthe correct direction. (The direction from the power supply side to the
load side is indicatedwith →.)(Figure 3)

Moving core
parting face

moving core securing claws on bothsides catch on the stoppers, you hear two clicks.)(Figure 2)

areas.These electric wires may not pass through the sensor owing to the error of the outer diameters of vinyl insulators finished by manufacturers or
deformation (bending) of the wires.Check the wire on site.

・For the details, ・see the manual for the combination measurement unit.

See the manual, please wire the polarity (Power supply side, Load side), 1 side (R phase), 2 side (S phase), 3 side (T phase) and the polarity (k, l) of the
secondary side of the CT to the k, l terminal of the measuring unit.

Measurement(installation)category CATⅢ

CE marking conformity standard Maximum voltage 127V/220V +10％ AC～

CE marking conformity combination unit

UL／c-UL conformity combination unit

Unité à combinaison conformée au UL/c-UL standard

* Please check the maximum voltage for the combination measurement unit.

Caution

table of specification is the normal sectional areas of 600V vinyl-coated cable.These values are the standard nominal sectional

Model EMU-CT50 EMU-CT100 EMU-CT250

Rated primary current 50A AC～ 100A AC～ 250A AC～

Maximum voltage*

(voltage to ground／line voltage)

Frequency 45-65Hz
Ratio error ±1%（5%～100% of rating，RL≦10Ω）

Phase displacement ±0.9 c rad（5%～100% of rating，RL≦10Ω）

Pollution degree

Applicable wire

size (reference)

Working temperature range

Working humidity range 5% to 95%RH (no condensation)

CE marking conformity standard EN61010-2-32

<Usage as the CE marking conformity article>

･As for the voltage to ground / line maximum voltage, 127V / 220VAC(+10%), the measurement category Ⅲ, pollution degree Ⅱ.
･Install the current sensorto the secondaryof the circuit breaker.
･Install the current sensor in the cabinet.
･Use the PVC insulation electric wire.(less than heat-resistant temperature 70°C,the rating voltage 300V class.)

(

Protective
cover

Moving core
locking claw

Figure 2

)

(

)

Figure 3

K side set
LINE side

(LINE side) (LOAD side)

Direction
of current

*Buy the tying bands.

266V/460V AC～

2

IV wire

CV wire

This sensor confirm CE marking standard in a condition to make combination use with Mitsubishi
MELSEC-Q series programmablecontrollers Energy Measuring Unit
(

Models QE81WH, QE81WH4W, QE84WH, QE83WH4W),Mitsubishi MELSEC-iQ-R series
programmable controllers Energy Measuring Unit (Model RE81WH), EcoMonitorLight
(Model : EMU4-BD1-MB, EMU4-HD1-MB) and EcoMonitorPlus (Model :EMU4-BM1-MB, EMU4-HM1-MB,
EMU4-A2, EMU4-VA2)

This sensor confirm UL/c-UL in a condition to make combination use with Mitsubishi MELSEC-Q
series programmablecontrollers Energy Measuring Unit (ModelsQE81WH,QE81WH4W,QE84WH
andQE83WH4W).
WhenEMU-CT50/100/250 is combined with EcoMonitorLight (Model:EMU4-BD1-MB, EMU4-HD1-MB),
EcoMonitorPlus(Model:EMU4-BM1-MB,EMU4-HM1-MB,EMU4-A2,EMU4-VA2),and Mitsubishi MELSEC
iQ-R series programmable controllers Energy Measuring Unit(Model RE81WH), it is necessary to confirm
compatibility with an end product.
CedétecteurestconforméauUL/c-UL standard sous condition d'être utilisé et combiné avec série MELSEC-Q
de Mi

tsubishi,appareilde contrôle et programmable,Unité d'Energie Mesurage(Modèle QE81WH,

QE81WH4W,QE84WH etQE83WH4W).
Lorsque EMU-CT50/100/250 est combiné avec EcoMonitorLight (Modèle:EMU4-BD1-MB, EMU4-HD1-MB),
et EcoMonitorPlus(Modèle:EMU4-BM1-MB,EMU4-HM1-MB,EMU4-A2,EMU4-VA2),et MELSEC iQ-R de
Mitsubishi, appareil de contrôle et programmable, Unité d'EnergieMesurage (Modèle:RE81WH),
il est nécessaire de confirmer la compatibilité avec le produit final.

2

60mm

or less 150mm2or less

2

38mm

or less 150mm2or less

-

5°C to +55°C (daily mean temperature: 35°C or less)

Direction
of current

Locking hole

Primary Cable

Tying bnd

（3×2）

4 Service Network

HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, Japan

Please refer to "catalog" or “user’s manual (Details)” for more detail.