Mitsubishi Electric EcoMonitorPro EMU2-RD3-F User manual

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Energy Measuring Unit (EcoMonitorPro)
MODEL EMU2-RD3-F, EMU2-RD5-F, EMU2-RD7-F (Non communication)
EMU2-RD3-C, EMU2-RD5-C, EMU2-RD7-C (CC-Link communication)
EMU2-RD2-F-4W, EMU2-RD4-F-4W (None communication; exclusive 3 phase 4 wire)
EMU2-RD2-C-4W, EMU2-RD4-C-4W (CC-Link communication; exclusive 3 phase 4 wire)
Instruction manual: Detailed edition
1. Introduction
Thank you for purchasing Mitsubishi energy measuring unit (EcoMonitorPro).
This unit is designed to measure various parameters of electricity flowing on a power line through the current sensor.
This manual explains the procedures for installing and using the unit. Read carefully the manual, and use the unit correctly. Before installing
the unit, read “Safety Precautions” to handle it correctly.
■Notation in manual
This manual uses the following signs.
Sign Meaning
Danger Improper handling in disregard of the instructions can result in death or serious injury.
Caution Improper handling in disregard of the instructions can result in personal injury or property damage.
Supplement Instructions to prevent trouble of the unit and to correctly operate the unit
Page of related information
■Confirmation of contents of package
Each unit comes with the following accessories. Check for missing ones. The accessories vary depending on the model.
Item Quantity Figure
Main Body
1
EMU2-RD3-F
EMU2-RD5-F
EMU2-RD7-F
EMU2-RD3-C
EMU2-RD5-C
EMU2-RD7-C
EMU2-RD2-F-4W
EMU2-RD4-F-4W
EMU2-RD2-C-4W
EMU2-RD4-C-4W
Instruction manual
Detailed edition (CD) 1
Instruction manual
Simple edition 1 MITSUBISHI
Connector for CC-Link
communication Note1 1
Note 1: Connector for CC-Link communication is bundled in only EMU2-RD*-C or EMU2-RD*-C-4W.
This product should not be used for the purpose of trading or certification of electric energy.
For trading and certification of electric energy, use a watt-hour meter (qualified).
2. Features
zThis unit is designed to measure various parameters of electricity flowing on a power line through the dedicated current sensor.
zThe single unit is capable of measuring the parameters on several transformer systems (differing in voltage and number of phases and
wires).
zThe unit can be applied to various primary voltage values and primary current values in combination with a potential transformer or a current
transformer.
zIt can transmit measuring data to a data collecting sequencer through CC-Link communication.

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3. Safety Precautions
3.1 Working environment and working conditions
Do not use the unit in any of the following places. Doing so may cause malfunction or reduction in service life.
⋅Place where the daily mean temperature
exceeds 35°C
⋅Place with much vibration or impact
⋅Place exposed to direct sunlight
⋅Place with strong electromagnetic field
or much foreign noise
⋅Place where the ambient temperature exceeds the working temperature range
(−5°C to 55°C)
⋅Place where the humidity exceeds the humidity range (30% to 80%RH) or
condensation occurs
⋅Place with much dust, corrosive gas, salt or oily smoke
⋅Place where the unit may be exposed to rain or drops of water
⋅Place where metallic particles or inductive substances are dispersed
3.2 Preparation before using
zEnsure that the working environment and working conditions in the installation location conform to the specifications.
zIt is necessary to set the CC-Link station number and transmission rate of this unit prior to use.
Set the phase and wire system, primary voltage and primary current.
For setting, it is necessary to use the optional display unit (EMU2-D65) or logging display unit (EMU2-D65-M). Order one of these units
when purchasing the measuring unit.
3.3 Installation and connection
Before installing and connecting the unit, read the instruction manual without fail. For safety, the unit shall be installed and connected by
experts in electrical work.
Caution
<Cautions for work>
zPerform wiring work in a dead state. Do not wire the unit in a live state. Doing so can cause electric shock, ground fault, unit failure and
fire.
zWhen threading and wiring, take utmost care that cuttings and wire pieces do not enter the unit.
zConnect the wires carefully checking the wiring diagram. Improper wiring can cause unit failure, fire and electric shock.
zTo prevent entry of noise, do not lay the transmission signal line and input/output signal line close to any power line or high-voltage line,
and or do not bind these lines.
zKeep the dust sheets applied on the unit while wiring work. After the completion of wiring work, remove the sheets.
zWhen opening and closing the terminal cover, take care not to apply undue force to the cover.
<Connection of terminal block>
zUse electric wire of an appropriate size (1.25 mm2). Use of wire of an improper size can cause fire due to heat generation.
zUse crimp-type terminals appropriate to the electric wire size (bare round terminals for M3.5 having an outer diameter of 7.2 mm or less).
Use of improper terminals can cause unit malfunction, failure, burnout or fire due to wire breaking and contact failure.
zTighten the screws to the specified torque (0.49 to 0.78 N⋅m). Excessive tightening can damage the terminals and screws.
zAfter tightening, be sure to check that all screws have been tightened. Failure to tighten any screw can cause unit malfunction, fire or
electric shock.
<Connection with current sensor>
zUse this product in combination with the dedicated current sensor.
zEMU-CT50, EMU-CT100, EMU-CT250, EMU-CT400 and EMU-CT600 are designed for low-voltage circuits (maximum voltage of
460 V). These models are not applicable to high-voltage circuits. When using EMU2-CT5 (-4W), pass the secondary side (5A)
of the current transformer through the sensor. The sensor can be connected directly to circuits of up to 200 V (maximum
voltage of 260 V). Connecting it to a high-voltage circuit by mistake may cause burnout of the unit or fire, resulting in a
hazardous situation.
zThe current sensor has polarity (directionality). When installing it, check the polarity.
zWhen the unit is used for a single-phase 3-wire circuit or a 3-phase 3-wire circuit, two current sensors are necessary.
zOne dedicated current sensor cable can connect two current sensors.
zConnect the unit and current sensor(s) with the dedicated cable.
<Wiring of CC-Link communication line and input signal line>
zWhen the transmission signal line and input signal line are laid in
parallel with a power line or a high-voltage line, keep the distance
shown in the right table between them.
zUse the specified cable for CC-Link connection. Dedicated CC-Link cable and dedicated CC-Link high-performance cable cannot be
used simultaneously. If the cables are used simultaneously, correct data transmission cannot be assured.
zThe terminal resistance shows different resistance value depending on the type of the dedicated cable.
zConnect the shielded wire of CC-Link connection cable to “SLD,” and ground “FG” according to Class D grounding (Class 3 grounding).
“SLD” and “FG” are connected in the unit.
zThe CC-Link transmission line is a small signal circuit. Lay the line at a distance of 10 cm or more from any heavy current circuit. If the
line is laid in parallel with such a circuit over a long distance, lay the line 30 cm or more away from the circuit. When using, ground the
FG terminal.
<Connection of FG terminal>
zFor practical use, ground the FG terminal.
zDo not connect the FG terminal when performing insulation resistance test or withstand voltage test.
zA high-voltage protective element is fitted between MA and FG and between MB and FG. If high voltage is applied for withstand voltage
test, the protective elements function to short-circuit MA and FG, and MB and FG.
Condition Distance
Low-voltage power line less than 600 V
Other high-voltage power line 30 cm or more 60 cm or more

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3.4 Instructions for use
zThis product should not be used for the purpose of trading or certification of electric energy regulated by Measurement Law.
zThis unit has a built-in clock. Set the clock (current date and time) prior to use. The accuracy of the clock is about 1 minute per month.
Adjust the time as necessary.
zBefore operating the unit, carefully check that there are no bare electric wires in a live state around the unit. If bare wires are laid around the
unit, immediately stop operating, and take proper measures, such as insulation and protection.
zWhen the clock or any other parameter is set or any setting is changed, the consistency with the currently retained data on time of
occurrence of maximum and minimum values, values upon occurrence of alarms and time of occurrence of alarms may not be ensured. In
this case, reset the maximum value, and clear the time of occurrence of maximum value in the past.
zIf a power failure occurs during setting from the display unit or the transmission line to the main body, values cannot be set correctly. Re-set
the values after power is restored.
Caution
zDo not disassemble or modify this product. Doing so can cause failure, electric shock or fire.
zUse the unit within the rated range stated herein. Using the unit out of the rated range may cause not only malfunction or unit failure, but
also ignition or burnout.
zA protective circuit against opening of the secondary terminal is incorporated on the secondary side of Models EMU2-CT5 (-4W),
EMU-CT50, EMU-CT100 and EMU-CT250. Opening the terminal during wiring work causes no problems. However, for safety, do not
continuously apply current with the terminal in the open state.
zThe current sensors EMU-CT400 and EMU-CT600 dedicated for this unit and the general split-type potential current transformer CW-5SL
have similar shapes. But they have quite different characteristics. Connect an appropriate dedicated current sensor. If CW-5SL is
connected directly to this unit, unit failure, burnout or fire may occur.
3.5 Instructions for maintenance
zWipe dirt on the surface with soft dry cloth. Avoid keeping a wipe in contact with the surface or wiping with benzene or thinner.
zCheck the unit for the following points to ensure correct operation of the unit for a long time. Particularly, Items ○
1to ○ 3shall be checked in
daily inspection.
○
1Check the product for damage.
○
2Check for abnormal indication of LED lamps.
○
3Check for abnormal noise, odor and heat generation.
○
4Check for loose fittings and loose wires on the terminal block.
(Perform the check stated in ○
4in the power-off state. Failure to do so can cause electric shock, unit failure or fire.)
3.6 Instructions for storage
zWhen storing the unit, turn off power, disconnect cables and wires, and put them in vinyl bags or the like.
zWhen storing the unit for a long time, avoid keeping it in a place as shown below. Doing so may result in failure or decrease in service life.
⋅Place where the ambient temperature is out of the range from −10°C to 60°C
⋅Place where the humidity exceeds the humidity range (30% to 80%RH) or
condensation occurs
⋅Place with much dust, corrosive gas, salt or oily smoke
⋅Place where the unit is exposed directly to rain, water droplets or sunlight
⋅Place where the daily mean temperature exceeds
35°C
⋅Place with much vibration or impact
⋅Place where metallic particles or inductive
substances are dispersed
3.7 Instructions for disposal
Dispose of this product appropriately in accordance with national or community rule.
3.8 Packaging materials and instruction manual
To reduce the effects on the environment, corrugated boards are used for packaging materials, and the instruction manual is printed on
recycled paper.
4. Attention
zThis document and this unit are delivered after strict quality control and product inspection. If the unit or instruction manual has any defect
caused by inadequacy of manufacture, we will replace it with a new one. Contact the store where you bought the unit. However, failure or
damage caused by act of God or incorrect usage is not included in the warranty.
zUnderstand that we are not liable for any trouble on the system caused by the customer or any third party, legal problem, failure caused by
improper use or during use of the unit and damage caused by other nonconformance.
zThe product is warranted without charge for less than one year after the day of your purchase or the delivery to the designated place or
within 18 month after the day of shipment from our plant (reckoned from the date of manufacture), whichever comes first.
zThe term of free warranty will not be renewed for the repaired product.
zIt is prohibited to reprint or copy part or all of this document in any form without our permission.
zWe are endeavoring to update this document to follow revisions to the software and hardware, but we cannot do so under unavoidable
circumstances.

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5. Contents
6.Part Names and Functions .....................................................................................................................................5
7.Installation................................................................................................................................................................6
8.Wiring Procedures...................................................................................................................................................7
8.1 Connection of voltage lines, sensors cable and sensors .....................................................................................7
Extension of current sensor cable.............................................................................................................................................9
Fitting of EMU2-CT5 (-4W).......................................................................................................................................................9
Fitting of EMU-CT50/CT100/CT250........................................................................................................................................10
Fitting of EMU-CT400/CT600 .................................................................................................................................................10
8.2 Connection of CC-Link communication line .......................................................................................................11
8.3 Connection of display unit (example of model EMU2-D65) ...............................................................................11
9.Setting Method.......................................................................................................................................................12
9.1 Setting of CC-Link station number and transmission rate..................................................................................12
9.2 Setting of ratings.................................................................................................................................................13
Phase and wire system...........................................................................................................................................................13
Primary voltage.......................................................................................................................................................................13
Sensor type and primary current.............................................................................................................................................13
Demand time limit...................................................................................................................................................................13
Upper and lower limit settings.................................................................................................................................................14
10.Operations of Instrument....................................................................................................................................17
10.1 Measuring functions .........................................................................................................................................17
10.2 Monitoring function ...........................................................................................................................................18
10.3 How to use the monitoring function..................................................................................................................19
10.4 Resolution of measuring data...........................................................................................................................20
Voltage and harmonic voltage RMS .......................................................................................................................................20
Current, current demand and harmonic current RMS.............................................................................................................20
Harmonic distortion rate..........................................................................................................................................................20
Power factor............................................................................................................................................................................20
Frequency...............................................................................................................................................................................20
10.5 Restrictions on measuring data........................................................................................................................21
11.Reference .............................................................................................................................................................22
11.1 Troubleshooting................................................................................................................................................22
11.2 Q&A..................................................................................................................................................................23
General...................................................................................................................................................................................23
Q&A relating to specifications.................................................................................................................................................23
Q&A relating to installation......................................................................................................................................................24
Q&A relating to connection.....................................................................................................................................................24
Q&A relating to setting............................................................................................................................................................24
12.Specifications ......................................................................................................................................................25
12.1 Common specifications ....................................................................................................................................25
12.2 CC-Link communication specifications.............................................................................................................28
13.Peripheral Devices...............................................................................................................................................28
14.External Dimensions...........................................................................................................................................29
15.Index......................................................................................................................................................................31
16.Enquiry .................................................................................................................................................................32

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6. Part Names and Functions
Example: Model EMU2-RD7-C
DISPLAY:
Connect the display unit cable.
STATION:
Station number setting switch
Set the CC-Link station number with this switch.
B RATE:
Baud rate setting switch.
Set the communication rate with this switch.
RESET:
Press this switch after setting or changing
the station number and the baud rate.
CC-Link communication connector:
Connect the CC-Link signal line.
SENSOR (SENSOR A, SENSOR B):
Connect the connector of the dedicated current sensor
cable.
P1, P2, P3:
Input voltage of the measuring circuit.
FG:
Keep the FG terminal grounded during practical use.
Caution
When performing the insulation resistance test or
withstand voltage test, disconnect the FG terminal.
MA, MB:
Input auxiliary power to operate this unit.
IEC rail fitting
Communication module:
CC-Link communication function block
RUN:
The status of the communication module is
displayed.
•On : Ready for communication
•Flashing : During setting change/in power-on status
•Off : In stopped state of communication
L RUN/L ERR/SD/RD:
The status of CC-Link communication is
displayed.
RUN:
This lamp is on while all circuits of this unit are in
operation.
•On : In operation
•Off : Out of operation
MEASURE (A-MEASURE, B-MEASURE):
The measuring status of each circuit is displayed.
•On/flashing :Under measurement
•Off :In stopped state of measurement
A
LARM (A-ALARM, B-ALARM):
This lamp is flashing while the upper/lower limit alarm of each
circuit is on.
•Flashing :Under alarming
•Off :No alarm
Front Right side
Circuit 1
Circuit 2
SENSOR
A
Circuit 3
SENSOR B
Circuit 4
SENSOR
A
Circuit 5
SENSOR B
Circuit 6
SENSOR
A
Circuit 7
SENSOR B
Example: Model EMU2-RD4-C-4W
DISPLAY:
Connect the display unit cable
SENSOR(SENSOR A, SENSOR B)
Connect the connector of the dedicated current sensor cable.
P0,P1,P2,P3
Input voltage of the measuring circuit
FG
Keep the FG terminal grounded during practical use.
Caution
When performing the insulation resistance test or
withstand voltage test, disconnect the FG terminal.
MA, MB
Input auxiliary power to operate this unit.
IEC rail fitting
RUN
The lamp is on while all circuits of this unit are in
operation.:
•On : In operation
•Off : Out of operation
MEASURE(A-MEASURE, B-MEASURE):
The measuring status of each circuit is displayed.
•On/flashing :Under measurement
•Off :In stopped state of measurement
A
LARM(A-ALARM、B-ALARM)
This lamp is flashing while the upper/lower limit alarm
of each circuit is on.
•Flashing :Under alarming
•Off :No alarm
Front Right side
Circuit 1
SENSOR
A
Circuit 2
SENSOR B
Circuit 3
SENSOR
A
Circuit 4
SENSOR B
STATION:
Station number setting switch
Set the CC-Link station number with this
switch.
B RATE:
Baud rate setting switch.
Set the communication rate with this switch.
RESET:
Press this switch after setting or changing the
station number and the baud rate.
CC-Link communication connector:
Connect the CC-Link signal line
Communication module:
CC-Link communication funcation block
RUN:
The status of the communication module is
displayed.
•On :Ready for communication
•Flashing :During setting change/in power-on
status
L RUN/L ERR/SD/RD:
The status of CC-Link communication is
displayed.
* RUN LED will light
approx. 10 seconds after
power is turned on.

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Supplementation ---------------------------------------------------------------------------------------------------------------------------------------------------------------
zTo each of the modules for the
second and following circuits,
the voltage lines and sensor
cables of two measuring
circuits can be connected.
Connect the voltage lines and
sensor cables as shown right.
Connection of the circuits 2 and 3 is shown as an example. Connect the
voltage line and sensor cable of each circuit to P1/P2/P3 for A and
SENSOR A or P1/P2/P3 for B and SENSOR B.
7. Installation
Caution
⋅For safety, the unit shall be installed and connected by experts in electrical work.
●Applicable IEC rail (35 mm) ●Installation ●Removal
⋅Fit the IEC rail with M4 or M5
screws at distances of 25 to 100
mm.
⋅When connecting some rails,
secure both ends with slide
preventive fittings.
⋅When installing the unit after
once it was removed from the
IEC rail, install it while pushing
the IEC rail fitting upward.
①Hang
②Push
②Pull-up
①Pull the IEC rail fitting
downward.
IEC rail
7.3 or more
Voltage and
current input
for circuit 2
Display of measuring status of circuit 2
Display of measuring status of circuit 3
Display ofAlarm status of circuit 2
Display ofAlarm status of circuit 3 Voltage and
current input
for circuit 3

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8. Wiring Procedures
•Connect all cables. When wiring, check the phase and wire system of the circuit to be connected, and see the relevant wiring
diagram. When connecting a potential transformer or a current transformer, see the transformer instruction manual.
•If the current sensor is installed in a strong magnetic field near a transformer or a large current cable bus bar, the measurements may be
affected. Install the sensor as far as possible from such a device.
8.1 Connection of voltage lines, sensor cables and sensors
Below given is an example of connection for measurement of some transformer systems (differing in voltage and number of phases and
wires) by one unit (example of connection of EMU2-RD7-C).
Circuit 1: 3-phase 3-wire system, primary voltage 690 V, primary current 800 A (A 690 V/110 V potential transformer is separately
necessary.)
Circuit 2: 3-phase 3-wire system, primary voltage 440 V, primary current 250 A (A 440 V/110 V potential transformer is separately
necessary.)
Circuit 3: Not used
Circuit 4: Single-phase 2-wire system, primary voltage 110 V, primary current 50 A
Circuit 5: Single-phase 3-wire system, primary voltage 110 V, primary current 100 A
Circuit 6: 3-phase 3-wire system, primary voltage 2200 V, primary current 400 A (A 2200 V/110 V potential transformer is separately
necessary.)
Circuit 7: Single-phase 2-wire system, primary voltage 110 V, primary current 50 A
N
EMU2-CT5
R
S
T
R
S
T
N
R
R
NR
S
T
R
EMU2-CT5
Current
transformer
Potential
transformer
440/110
Potential
transformer
2200/110
Circuit 1
Circuit 2
Circuit 4
Circuit 5
Circuit 6
Circuit 7
～
100 to 220 V
AC Potential
transformer
690/110
Current
transformer
Supplementation ---------------------------------------------------------------------------------------------------------------------------------------------------------------
zWhen the unit is used for a single-phase 2-wire circuit, the side 3 of the current sensor cable is not used. Disconnect the side 3 of the cable
from the connector, and protect the terminal with insulating tape as shown below.
Insulation tape

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Below given is an example of connection for measurement of 2 transformer systems (differing in voltage and number of phases and wires) by
one unit (example of connection of EMU2-RD4-F-4W).
Circuit 1: primary voltage 63.5/110V, primary current 800A (EMU2-CT5-4W)-------800/5A current transformer is separately necessary.
Circuit 2: primary voltage 63.5/110V, primary current 250 A (EMU-CT250)
Circuit 3: primary voltage 254/440V, primary current 600 A (EMU-CT600)----------- V
3
110
3
440
potential transformer is separately necessary.
Circuit 4: primary voltage 254/440V, primary current 1000 A (EMU2-CT5-4W)----- V
3
110
3
440
potential transformer and 1000/5A current
transformer are separately necessary.
EMU2-CT5-4W
A
C100
～220
V
0
1
2
3
CT Circuit 1
Circuit 2
0
1
2
3
VT
3
110
3
440
CT
Circuit 3
Circuit 4
EMU2-CT5-4W
63.5/110V
254/440V

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結束バンド
固定用穴
Tying band
Locking hole
zWhen the unit is used for a circuit of 440 V or more, use a potential transformer without fail. Connect
the secondary side of the potential transformer to the terminals P1 to P3.
zPass the secondary side (5 A) of the current transformer through EMU2-CT5 (-4W).
zAs the current transformer, a general current transformer for 5 A can be used.
zIt is recommended to connect protective devices (breakers or fuses) to the auxiliary supply voltage
input (terminals MA and MB) and the voltage input circuit (terminals P1, P2 and P3) for maintenance
to change the wiring or replace a device.
■Extension of current sensor cable
The current sensor cable EMU2-CB1-DR/EMU2-CT5 (-4W) can be extended in accordance with the following procedures.
◆Extension with current sensor extension cable EMU2-CB-T**M (standard type)
EMU2-CB1-DR
EMU2-CB-T**M
Brown
Blue
White
White
◆Extension with current sensor extension cable EMU2-CB-T**MS (separate type)
1) Disconnect the connectors.
EMU2-CB1-DR
Brow
n
Blue
White
White
Supplementation-----------------------------
zFor EMU-CT50, EMU-CT100, EMU-CT250, EMU-CT400
and EMU-CT600, the cable length can be extended to up
to 50 m (the total wiring length is up to 50.5 m).
zFor EMU2-CT5 (-4W), the cable length can be extended
to up to 10 m (the total wiring length is up to 10.5 m).
zUse EMU2-CB-T**MS when the side 1 is installed at a
distance from the side 3.
2) Connect the extension cables.
EMU2-CB-T**MS
Brown
Blue
White
White
■Fitting of EMU2-CT5 (-4W)
Fit the sensor to the cable of the circuit to be measured in accordance with the following procedures.
1) Slide the lock pin in the arrow direction.
2) Pass the electric wire into the clamp, and
close the clamp.
3) Push the lock pin until it is locked while
keeping the clamp with fingers in the fully
closed state.
Caution
zThe lock pin is a metallic part. Touching a live part may cause electric shock, unit failure or fire.
zThe cores may be damaged by shock. The damaged cores affect directly the unit performance.
Take care not to give shock to them.
zEven minute particles between core mating surfaces affect directly the performance (lower
measurements may be obtained). Check the surfaces carefully.
zIf undue force is applied to the open clamp, the clamp may be damaged. If the clamp is set in a
wrong direction, normal measurement cannot be performed.
zTo secure the through electric wire and the sensor, use tying bands 2.6 mm or less in width. To
secure them, pass each tying band to one of the current sensor locking holes. Lightly tie the bands.
Take care not to tighten the bands excessively. (The current sensor has four locking holes in all on both sides.)
P1
P3
P2
ブレーカもしくはヒューズ
MB
MA
Breakers or fuses
コア
一次導体（ケーブル）ロックピン
クランプ
Lock pin Clamp
Cores
Primary conductor (cable)

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■Fitting of EMU-CT50/CT100/CT250
Fit the sensor to the cable of the circuit to be measured.
1) Open the moving core as shown right.
Slowly lift the moving core locking claws on both sides of the moving core to open and remove
them from the stoppers. Do not open the core forcibly. Doing so may break the claws.
2) Insert the cable from beneath taking care not to bring the cable into contact with the core
parting faces. Before inserting the cable, check the symbols K and L to fit the current sensor in
the correct direction. (The direction from the power supply side to the load side is indicated
with Æ.)
3) 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 moving core securing claws on both
sides catch on the stoppers, you hear two clicks.)
4) Pass the tying bands into the current sensor locking holes to secure
the sensor with the cable. Lightly tie the band. Take care not to
tighten the bands excessively. (The current sensor has four locking
holes in all on both sides.)
5) Cut off the residual parts of the tying bands with nippers appropriately.
6) Remove the protective cover of the secondary terminal lifting the center of the protective cover,
and connect the specified sensor cable. Check the terminal symbols shown on the
secondary terminal surface, and take care not to connect the cable incorrectly.
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
zWhen opening the moving core of the split type current sensor, do not open the moving core locking claws excessively. Doing so
may damage the moving core locking claws.
zThe applicable electric wire size is shown below.
EMU-CT50 EMU-CT100 EMU-CT250
IV wire 60 mm2or less 60 mm2or less 150 mm2or less
Applicable wire
size (reference) CV wire 38 mm2or less 38 mm2or less 150 mm2or less
■Fitting of EMU-CT400/CT600
Fit the sensor to the cable of the circuit to be measured in accordance with the
following procedures.
1) Remove the band ○
1in the arrow (upward) direction, and remove the core
cover.
2) Remove the terminal cover, and set the secondary short-circuiting switch to
“Short.”
3) Loosen the screw ○
2, open the core band, and remove the core. Take care
that dust does not adhere to the core.
4) Loosen the screws ○
3, and fit the main body onto the cable. Then, tighten
the screws ○
3to secure the cable using the cable direct fitting. Tighten the
screws to such an extent that the direct fitting is not bent.
5) Set “K” on the removed core and “K” on the main body on the same side,
return the core as it was, and tighten the core band with the screw ○
2.
6) Fit the core cover, and secure it with the band ○
1.
7) After connecting the secondary terminal and the multi-circuit power
measuring unit, set the secondary short-circuiting switch to “Open,” and fit
the terminal cover.
Supplementation ----------------------------------------------------------------------------------------------------------------------
zBefore passing the cable, ensure that the current sensor is fitted in the correct direction. Current flows from K to L.
K: Power supply side
L: Load side
These applicable electric wire sizes have been
determined based on the values shown on the
catalogs of general vinyl-coated wires. The wire to
be used may have a different sheath thickness.
Check whether the wire to be used can be passed
through the sensor referring to the drawing o
f
external dimensions of the product.
一次導体
(ケーブル)
可動コア
固定づめ
可動コア
固定づめ
可動コア
ストッパ 可動コア分割面
保護カバー
固定用穴
(3×2)
固定用穴
(3×2)
結束バンド結束バンド
一次導体
(ケーブル)
電流の方向
Protective cover
Moving core
locking claw
Direction of
current
Stopper
Moving core
Moving core parting face
Locking hole
(3×2)
Primary
conductor
Locking hole
Moving core
locking claw
Locking hole
Primary
conductor
(cable)
Locking hole
(3×2)
Core band Core
Terminal cover
Cable direct fitting
○
2
Secondary terminal
Secondary
Short-circuiting switch
○
3
Primary current
○
1
Core cover
Primary conductor

(11/32)
8.2 Connection of CC-Link communication line
Wire type In the case of connection of 1 wire In the case of connection of 2 wires
Solid wire 0.2 mm2to 2.5 mm22 wires ×0.2 mm2 to 1.0 mm2
Twisted wire 0.2 mm2to 2.5 mm22 wires ×0.2 mm2 to 1.5 mm2
Twisted wire with bar terminal (without insulating sleeve) 0.25 mm2to 2.5 mm22 wires ×0.25 mm2to 1.0 mm2
Twisted wire with bar terminal (with insulating sleeve) 0.25 mm2to 2.5 mm2-
*1: The length of the signal line coating to be removed is 7 mm.
*2: Do not solder-plate the core wires.
Supplementation --------------------------------------------------------------------------------------------------------------------------------------------------------------
zUse the specified cable for CC-Link connection. The dedicated CC-Link cable and dedicated CC-Link high-performance cable must not
be used simultaneously. If the cables are used simultaneously, correct data transmission cannot be assured.
The terminal resistance shows different resistance value depending on the type of the dedicated cable.
zConnect the shielded wire of the CC-Link connection cable to “SLD,” and ground “FG” according to Class D grounding (Class 3
grounding). “SLD” and “FG” are connected in the unit.
zThe CC-Link transmission line is a small signal circuit. Lay the line at a distance of 10 cm or more from any heavy current circuit. If the
line is laid in parallel with such a circuit over a long distance, lay the line 30 cm or more away from the circuit. When using, ground the
FG terminal.
zAs the CC-Link communication line, use a dedicated line, and ensure that the total wiring distance, station-to-station distance and
terminal resistance are appropriate to B RATE. If a dedicated line is not used or any wiring requirement is not met, normal
communication may not be made. (For the dedicated line and wiring requirements, see the instruction manual for CC-Link master unit.)
zIt is necessary to fit the terminal resistance supplied with the CC-Link master unit to the units on both sides of the CC-Link
communication line. When the measuring unit is connected at an end of the CC-Link transmission line, connect it between the terminals
DA and DB.
zThe terminal resistance varies depending on the type of the CC-Link cable to be used. See the manual for the terminal resistance
supplied with the CC-Link master unit.
8.3 Connection of display unit (example of model EMU2-D65)
To DISPLAY
To IN1
Small display unit
EMU2-D65
Supplementation --------------------------------------------------------------------------------------------------------------------------------------------------------------
zFor the details, see the instruction manual for the display unit.
Cable tightening screws
CC-Link
communication
connector
○
1Draw out the CC-Link communication connector from the unit.
○
2Loosen the cable tightening screws on the CC-Link communication connector. Use
a thin slotted screwdriver (blade edge thickness: 0.6 mm/overall length: 3.5 mm).
○
3Insert the signal line according to the marking on the side of the CC-Link
communication connector.
○
4Secure the line with the tightening screws (recommended tightening torque: 0.5 to
0.6 N⋅m).
Installation in the middle of the
transmission route Installation at the end of the transmission route
Terminal
resistance

(12/32)
9. Setting Method
9.1 Setting of CC-Link station number and transmission rate
When connecting this unit to the CC-Link transmission line, set a unique station number (STATION) for the unit before applying power to the
unit, and set the transmission rate (B RATE). A unit provided with the CC-Link communication function communicates mutually with another
unit at the transmission rate that has been set by using the station number. Set the station number and communication rate without fail.
To set the station number, change the setting of the station number setting switch ( see page 5).
To set the transmission rate, change the setting of the B RATE setting switch ( see page 5).
1Set the station number (STATION).
zThis unit is a remote device station that occupies one station.
The station number setting range is from 1 to 64.
zThe station number is the sum of the values of the station number setting switch toggles that are set to ON.
zTo turn on the station number setting switch toggles, use a thin screwdriver or bar.
zWhen setting the station number of this unit to 36, set the switch as shown below.
⋅Turn on the switch toggles 1 and 2 on the ×10 side of the station number setting switch and the switch toggles 2 and 4 on the ×1 side
(The arrow => indicates the ON position.)
×10 (tens place) = (1+2) ×10 = 30
×1 (unit’s place)= (2+4) ×1 = 6
Î30 + 6 = 36 …Station No. 36
2Set the transmission rate (B RATE).
zTo set the B RATE setting switch, use a thin slotted screwdriver.
zThe relationship between the transmission rate and the setting switch is shown below.
Transmissio
n rate 156k 625k 2.5M 5M 10M
Setting ■□
■□
■□
■□
■□
□■
■□
□■
■□
■□
□■
□■
□■
■□
■□
* If the switch is set to a state not shown above, an error occurs.
3If the station number and/or the transmission rate are/is set or changed after power is applied to the unit, press the reset switch.
zIf the reset switch is not pressed, the setting(s) will be made ineffective.
zIt takes some seconds until the settings are reset. Keep pressing the reset switch, and release the switch after ensuring that RUN LED
is turned off.
zDo not use a mechanical pencil to change the setting of the station number switch or the transmission rate switch.
Broken leads and lead powders may be scattered on the internal circuit, thereby causing malfunction or failure.
zThe station-to-station cable length and the maximum total cable extension distance vary depending on the
transmission rate.
zTake care that a station number is not duplicated in a transmission route. If a number is duplicated, an error occurs.
zThe number of units that meets the following conditions 1 and 2 can be connected on CC-Link. When only energy measuring units are
connected, up to 42 units can be connected.
Condition 1: {(1 ×a)+(2 ×b)+(3 ×c) + (4 ×d)} ≤64
a: Number of units occupying one station b: Number of units occupying two stations
c: Number of units occupying three stations d: Number of units occupying four stations
Condition 2: {(16 ×A)+(54 ×B)+(88 ×C)} ≤2304
A: Number of remote I/O station, B: Number of remote device stations, C: Number of local stations
Caution
Set the to
gg
les 1 and 2 to ON.
Set the to
gg
les 2 and 4 to ON.

(13/32)
9.2 Setting of ratings
For setting, it is necessary to use the optional small display unit (EMU2-D65) or logging display unit (EMU2-D65-M). Order one of these
units when purchasing this unit.
In case of EMU2-RD3-F/C, EMU2-RD5-F/C, EMU2-RD7-F/C
■Phase and wiring [Default: 3-phase 3-wire]
One of the following systems can be set for each circuit.
Single-phase 2-wire, single-phase 3-wire and 3-phase 3-wire
■Primary voltage [Default: 220 V]
The primary voltage values applicable to each unit type are shown below. The primary voltage can be selected from the following values for each
circuit.
Settings
110 V, 220 V, 440 V, 690 V, 1100 V, 2200 V, 3300 V, 6600 V, 11000 V, 13200 V, 13800 V
15000 V, 16500 V, 22000 V, 24000 V, 33000 V, 66000 V, 77000 V, 110000 V
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
•On a single-phase 3-wire circuit, use the unit at the primary voltage setting of 110 V.
•The unit can be connected directly to a 110 V or 220 V circuit. To connect it to a circuit of 440 V or more, a potential transformer must
be connected externally.
■Sensor type and primary current [Default: Direct sensor/100 A]
The primary current must be set according to the sensor type as shown below. One of the following settings can be selected for each circuit.
Sensor type Primary current setting
EMU-CT50 50A
EMU-CT100 100A
EMU-CT250 250A
EMU-CT400 400A
Direct sensor
EMU-CT600 600A
5A
sensor
EMU2-CT5 5A, 6A, 7.5A, 8A, 10A, 12A, 15A, 20A, 25A, 30A, 40A, 50A, 60A, 75A, 80A, 100A, 120A, 150A, 200A, 250A, 300A, 400A,
500A, 600A, 750A, 800A, 1000A, 1200A, 1500A, 1600A, 2000A, 2500A, 3000A, 4000A, 5000A, 6000A, 7500A, 8000A,
10000A, 12000A, 20000A, 25000A, 30000A
Caution
EMU-CT50, EMU-CT100, EMU-CT250, EMU-CT400 and EMU-CT600 are designed for low-voltage circuits (maximum voltage of 460
V). These models are not applicable to high-voltage circuits. When using EMU2-CT5, pass the secondary side (5A) of the current
transformer through the sensor. The model can be connected directly to circuits of up to 200 V (maximum voltage of 260 V).
Connecting it to a high-voltage circuit by mistake may cause burnout of the unit or a fire, resulting in a hazardous situation.
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
zWhen EMU2-CT5 is used, set the ratings of the primary CT.
zEnsure that the product of primary voltage setting and primary current setting does not exceed 88665 kW (the setting range is limited
by the full-load power). For example, if the primary current is set to 30000 A when the primary voltage setting is 110000 V, the primary
voltage setting is automatically initialized to 220 V. If the primary voltage is set to 110000 V when the primary current setting is 30000 A,
the primary current setting is automatically initialized to 100 A.
■Demand time limit [Default: 2 min]
The current demand time limit and the power demand time limit can be set separately. One of the following settings of each item can be selected for
each circuit.
Item Settings
Current demand time limit 0, 10 sec, 20 sec, 30 sec, 40 sec, 50 sec, 1 to 15 min (in 1-min steps), 20 min, 25 min and 30 min
Power demand time limit 0, 10 sec, 20 sec, 30 sec, 40 sec, 50 sec, 1 to 15 min (in 1-min steps), 20 min, 25 min and 30 min

(14/32)
■Upper and lower limit settings [Defaults: Upper limit setting = Max. setting Lower limit setting = Min. setting]
The upper and lower limits can be set for each circuit as shown below. The upper and lower limits can be set only on the display unit. They
cannot be set by CC-Link communication.
◆Current demand upper/lower limit settings
Rated primary current setting Min. upper/lower limit setting Setting step Max. upper/lower limit setting
5A to 30A 0.00A 0.01A
40A to 300A 0.0A 0.1A
400A to 3000A 0A 1A
4000A to 30000A 0A 10A
Rated primary current setting
◆Voltage upper/lower limit setting
Rated primary voltage setting Min. upper/lower limit setting Setting step Max. upper/lower limit setting
110 V to 220 V 0.0 V 0.1 V
440 V to 2200 V 0 V 1 V
3300 V to 110000 V 0 V 10 V
Rated primary voltage setting
×(15/11)
◆Power demand upper/lower limit setting
Full-load power (kW) Min. upper/lower limit
setting Setting step Max. upper/lower limit setting
Less than 12 0.000 kW 0.001 kW
12 to less than 120 0.00 kW 0.01 kW
120 to less than 1200 0.0 kW 0.1 kW
1200 to less than 12000 0 kW 1 kW
12000 to less than 120000 0 kW 10 kW
120000 or over 0 kW 100 kW
Full-load power
◆Power factor upper/lower limit setting
Min. upper/lower limit
setting Setting step Max. upper/lower limit setting
LEAD 0.50 0.05 LAG 0.50
◆Alarm delay time [Default: 10 sec]
The setting is applied to all upper/lower limit alarms.
Setting value
0, 5 sec, 10 sec, 20 sec, 30 sec, 40 sec, 50 sec, 1 to 5 min (in 1-min steps)

(15/32)
In case of EMU2-RD2-F/C-4W, EMU2-RD4-F/C-4W
■Phase and wire system
Fixed 3-phase 4-wire
■Primary voltage [Default: 220/380 V]
The primary voltage can be selected from the following values for every 2 circuits. (Primary voltage is common for circuit1 and circuit2, or circuit3
and circuit4)
Settings
63.5/110V, 110/190V, 120/208V, 220/380V, 240/415V, 254/440V
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
•The unit can be connected directly to a 110 V or 220 V circuit. To connect it to a circuit of 440 V or more, a potential transformer must
be connected externally.
■Sensor type and primary current [Default: Direct sensor/100 A]
The primary current must be set according to the sensor type as shown below. One of the following settings can be selected for each circuit.
Sensor type Primary current setting
EMU-CT50 50A
EMU-CT100 100A
EMU-CT250 250A
EMU-CT400 400A
Direct sensor
EMU-CT600 600A
5A
sensor
EMU2-CT5 -4W 5A, 6A, 7.5A, 8A, 10A, 12A, 15A, 20A, 25A, 30A, 40A, 50A, 60A, 75A, 80A, 100A, 120A, 150A, 200A, 250A, 300A, 400A,
500A, 600A, 750A, 800A, 1000A, 1200A, 1500A, 1600A, 2000A, 2500A, 3000A, 4000A, 5000A, 6000A, 7500A, 8000A,
10000A, 12000A, 20000A, 25000A, 30000A
Caution
EMU-CT50, EMU-CT100, EMU-CT250, EMU-CT400 and EMU-CT600 are designed for low-voltage circuits (maximum voltage of 460
V). These models are not applicable to high-voltage circuits. When using EMU2-CT5-4W, pass the secondary side (5A) of the
current transformer through the sensor. The model can be connected directly to circuits of up to 200 V (maximum voltage of 260
V). Connecting it to a high-voltage circuit by mistake may cause burnout of the unit or a fire, resulting in a hazardous situation.
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
zWhen EMU2-CT5 -4W is used, set the ratings of the primary CT.
■Demand time limit [Default: 2 min]
The current demand time limit and the power demand time limit can be set separately. One of the following settings of each item can be selected for
each circuit.
Item Settings
Current demand time limit 0, 10 sec, 20 sec, 30 sec, 40 sec, 50 sec, 1 to 15 min (in 1-min steps), 20 min, 25 min and 30 min
Power demand time limit 0, 10 sec, 20 sec, 30 sec, 40 sec, 50 sec, 1 to 15 min (in 1-min steps), 20 min, 25 min and 30 min
■Upper and lower limit settings [Defaults: Upper limit setting = Max. setting Lower limit setting = Min. setting]
The upper and lower limits can be set for each circuit as shown below. The upper and lower limits can be set only on the display unit. They
cannot be set by CC-Link communication.
◆Current demand upper/lower limit settings
Rated primary current setting Min. upper/lower limit setting Setting step Max. upper/lower limit setting
5A to 30A 0.00A 0.01A
40A to 300A 0.0A 0.1A
400A to 3000A 0A 1A
4000A to 30000A 0A 10A
Rated primary current setting
◆Voltage upper/lower limit setting
Rated primary voltage setting Min. upper/lower limit setting Setting step Max. upper/lower limit setting
63.5/110V to 240/415V 0.0 V 0.1 V
254/440V 0 V 1 V Rated primary voltage setting
×(15/11)
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
zVoltage upper/lower limit setting is common for circuit1 and circuit2, or circuit3 and circuit4.
zVoltage upper/lower limit monitors not “phase voltage” but “line voltage”

(16/32)
◆Power demand upper/lower limit setting
Full-load power (kW) Min. upper/lower limit
setting Setting step Max. upper/lower limit setting
Less than 12 0.000 kW 0.001 kW
12 to less than 120 0.00 kW 0.01 kW
120 to less than 1200 0.0 kW 0.1 kW
1200 to less than 12000 0 kW 1 kW
12000 to less than 120000 0 kW 10 kW
Full-load power
◆Power factor upper/lower limit setting
Min. upper/lower limit
setting Setting step Max. upper/lower limit setting
LEAD 0.50 0.05 LAG 0.50
◆Alarm delay time [Default: 10 sec]
The setting is applied to all upper/lower limit alarms.
Setting value
0, 5 sec, 10 sec, 20 sec, 30 sec, 40 sec, 50 sec, 1 to 5 min (in 1-min steps)
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
•When any setting is changed, settings and measuring data are initialized according to the following table. Reset the relevant
parameters.
Alarm setting
Setting item
Parameter to be initialized
Phase and
wire system Sensor type Primary voltage Primary voltage Demand time limit Current Voltage Electric
power Power factor Delay time Clock
Sensor input switching Initialize
Primary voltage Initialize *1
Primary current Initialize Initialize *1
Demand time limit
Current upper/lower limit setting Initialize Initialize Initialize
Voltage upper/lower limit setting Initialize Initialize
Electric power upper/lower limit setting Initialize Initialize Initialize Initialize
Power factor upper/lower limit setting
Settings
Alarm delay time
Current upper/lower limit alarm value and
date and time of occurrence Initialize Initialize Initialize Initialize
Voltage upper/lower limit alarm value and
date and time of occurrence Initialize Initialize Initialize
Electric power upper/lower limit alarm
value and date and time of occurrence Initialize Initialize Initialize Initialize Initialize
Power factor upper/lower limit alarm value
and date and time of occurrence Initialize Initialize Initialize Initialize Initialize
Current Instantaneous/total Initialize Initialize Initialize
Demand current
Instantaneous/max./min. Initialize Initialize Initialize Initialized when
setting for current
is changed
Voltage
Instantaneous/max./min./total Initialize Initialize
Electric power Instantaneous Initialize Initialize Initialize Initialize
Demand power
Instantaneous/max./min. Initialize Initialize Initialize Initialize Initialized when
setting for electric
power is changed
Power factor
Instantaneous/max./min. Initialize Initialize Initialize Initialize
Reactive power Initialize Initialize Initialize Initialize
Frequency Initialize
High-frequency current total effective value Initialize Initialize Initialize
High-frequency voltage total effective value Initialize Initialize
High-frequency current total distortion
factor Initialize Initialize Initialize
High-frequency voltage total distortion
factor Initialize Initialize
High-frequency current n-th effective value Initialize Initialize Initialize
High-frequency voltage n-th effective value Initialize Initialize
High-frequency current n-th distortion
factor Initialize Initialize Initialize
High-frequency voltage n-th distortion
factor Initialize Initialize
Electric power
Measuring data
Reactive power energy
Note 1: The primary voltage and primary current must be set to ensure that the product of primary voltage setting and primary current setting
does not exceed 88665 kW. For example, if the primary current is set to 30000 A when the primary voltage setting is 110000 V, the
primary voltage setting is automatically initialized to 220 V. If the primary voltage is set to 110000 V when the primary current setting is
30000 A, the primary current setting is automatically initialized to 100 A.
Note 2: When the time is changed over a time limit (30 min), the parameter is initialized. It is not initialized when the change is made within
one time limit.

(17/32)
10. Operations of Instrument
10.1 Measuring functions
The measuring parameters are shown in the following table.
Measuring item Measuring parameters of each unit type
Details EMU2-RD3-F/C
EMU2-RD5-F/C
EMU2-RD7-F/C
EMU2-RD2-F/C-4W
EMU2-RD4-F/C-4W
R ●●
S Note 1 ●●
T Note 1 ●●
N
●
Instantaneous current value
Total ●●
R ●●
S Note 1 ●●
T Note 1 ●●
N
●
Maximum ●●
Minimum ●●
Current demand
* The moving average in the specified
time limit is indicated.
Date and time of
occurrence of max. and min. ●●
R-S ●●
S-T Note 1 ●●
T-R Note 1 ●●
R-N
●
S-N
●
T-N
●
Total ●●
Maximum ●●
Minimum ●●
Voltage
Date and time of
occurrence of max. and min. ●●
Current value of electric power ●●
Current value ●●
Maximum ●●
Minimum ●●
Power demand
* The moving average in the specified
time limit is indicated.
Date and time of
occurrence of max. and min. ●●
Reactive power ●●
Current value ●●
Maximum ●●
Minimum ●●
Power factor
Date and time of
occurrence of max. and min. ●●
Frequency ●●
R ●●
S
●
High-frequency current total effective
value/distortion factor T Note 1 ●●
R-S ●
S-T Note 1 ●
High-frequency voltage total effective
value/distortion factor R-N, S-N, T-N ●
R ●●
S
●
High-frequency current n-th effective
value/content T Note 1 ●●
R-S ●
S-T Note 1 ●
High-frequency voltage n-th effective
value/content R-N, S-N, T-N ●
Electric power ●●
Reactive power energy ●●
Note 1: When the phase and wire system is set to single-phase 2-wire, these parameters are not measured.

(18/32)
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
•Measuring parameters to be displayed on the display unit can be selected. For the details, see the instruction manual for each display
unit.
•The measuring conditions of following item vary with the phase wire system.
Item Phase wire system Measuring condition
Single-phase 2-wire Total current = IR
Single-phase 3-wire, 3-phase 3-wire Total current = (IR+ IT)/2
Total current
3-phase 4-wire Total current = (IR+ IS+ IT)/3
Single-phase 2-wire Total voltage = VR-S
Single-phase 3-wire, 3-phase 3-wire Total voltage = (VR-S + VT-R)/2
Total voltage
3-phase 4-wire Total voltage = (VR-S + VS-T + VT-R)/3
Single-phase 3-wire Larger value of IRor IT
3-phase 3-wire Largest value of IR, ISand IT
Maximum current
3-phase 4-wire Largest value of IR, IS, ITand IN
Single-phase 3-wire Smaller value of IRor IT
3-phase 3-wire Smallest value of IR, ISand IT
Minimum current
3-phase 4-wire Smallest value of IR, ISand IT
Single-phase 3-wire Larger value of VR-S or VT-R
3-phase 3-wire Largest value of VR-S, VS-T and VT-R
Maximum voltage
3-phase 4-wire Largest value of VR-S, VS-T and VT-R
Single-phase 3-wire Smaller value of VR-S or VT-R
3-phase 3-wire Smallest value of VR-S, VS-T and VT-R
Minimum voltage
3-phase 4-wire Smallest value of VR-S, VS-T and VT-R
10.2 Monitoring function
The parameters to be monitored are shown in the following table.
Monitoring item
Detail
Value upon
occurrence
Current demand
upper/lower limit alarm
Date and time of
occurrence
Value upon
occurrence
Voltage upper/lower limit
alarm
Date and time of
occurrence
Value upon
occurrence
Power demand upper/lower
limit alarm
Date and time of
occurrence
Value upon
occurrence
Power factor upper/lower
limit alarm
Date and time of
occurrence
Supplementation ----------------------------------------------------------------------------------------------------------------------------------------------------------------
•This unit has only a function to monitor the conditions of occurrence of upper/lower limit alarms and the history of upper/lower limit
alarms (date and time of occurrence and values upon occurrence) on the display unit.
•To monitor the current and electric power as instantaneous values, set the demand time limit to 0 second.
•The upper and lower limits can be set only on the display unit. They cannot be set by CC-Link.
•Each value upon occurrence and date and time of occurrence can be checked only on the display unit. They cannot be read by CC-Link.
On CC-Link, only the alarm status can be checked.

(19/32)
10.3 How to use the monitoring function
This unit can monitor the upper and lower limits of measurements of voltage, current demand, power demand and power factor separately.
<Monitor setting>
⋅Upper limit setting: Set the measurement upper limits. For the settings and the setting ranges, see page 11.
⋅Lower limit setting: Set the measurement lower limits. For the settings and the setting ranges, see page 11.
⋅Alarm delay time : If the measurement is kept higher than the upper limit setting or lower than the lower limit setting for less than the
specified alarm delay time, the alarm is not given. This function is useful in removing the rush current of load from the
parameters to be monitored. For the setting and the setting range, see page 12.
<Conditions of occurrence of alarm>
Mode Condition of occurrence of alarm
Measurement > Upper limit setting
Occurrence Alarm delay time can be set.
Upper limit
monitoring Recovery Measurement ≤Upper limit setting
Measurement < Lower limit setting
Occurrence Alarm delay time can be set.
Lower limit
monitoring Recovery Measurement ≥Lower limit setting
<Monitoring data>
⋅Alarm status :Indicates whether the alarm has occurred or not.
⋅Value upon occurrence of alarm :Value upon occurrence of the alarm (when condition of occurrence of alarm was met) (not the
maximum value)
⋅Date and time of occurrence of alarm :Date and time when the alarm occurred (condition of occurrence of alarm was met)
Example of current demand upper limit alarm
Example of current demand lower limit alarm
Measuremen
t
Upper limit
alarm
Time
A
larm delay
time
Occurrence of
upper limit alarm Recovery of
upper limit alarm
Value upon occurrence
of upper limit alarm
This period is regarded as the duration of time for which the
alarm is going on.
Date and time of occurrence
of upper limit alarm
Display unit:Example of display
on EMU2-D65
Measurement
Lower limit
alarm
Time
A
larm delay
time
Occurrence of
lower limit alarm Recovery of lower
limit alarm
Value upon occurrence
of lower limit alarm
Date and time of occurrence
of lower limit alarm
Display unit:Example of display
on EMU2-D65
This period is regarded as the duration of time for which the
alarm is going on.
Alarm Status
PF
Upp.
Low. ○
○○○○
●○○
ＷＶＡ
Alarm Status
PF
Upp.
Low. ○
○○○●
○○○
ＷＶＡ
04/02 11:58
Upper
5
Ａ
114
.
04/11 10:32
Lower
2
Ａ
2.

(20/32)
10.4 Resolution of measuring data
The resolution of measuring data is determined as follows according to the rating settings (phase and wire system, primary voltage and primary
current).
■Voltage and harmonic voltage RMS ■Current, current demand and harmonic current RMS
Rated primary voltage
setting Resolution
110 V to 220 V 1st decimal place 0.1 V
440 V to 2200 V Integer 1 V
3300 V to 110000 V x10 10 V
Rated primary voltage
setting Resolution
5A to 30A 2nd decimal place 0.01A
40A to 300A 1st decimal place 0.1A
400A to 3000A Integer 1A
4000A to 30000A x10 10A
■Harmonic distortion rate
1st decimal place: 0.1%
■Power factor
3rd decimal place: 0.001
■Frequency
1st decimal place: 0.1 Hz
■Electric power, power demand, reactive power, electric energy and reactive power energy
Single-phase 2-wire Single-phase 3-wire
3-phase 3-wire
3-phase 4-wire
Primar
y
volta
g
e settin
g
W, var : 3rd decimal place
Wh, varh: 2nd decimal place
W, var : 1st decimal place
Wh, varh: Integer
W, var : Integer
Wh, varh: ×10
Primary current setting (A)
Primary current setting (A)
W, var : 3rd decimal place
Wh, varh: 2nd decimal place
W, var : 2nd decimal place
Wh, varh: 1st decimal place
W, var : 1st decimal place
Wh, varh: Integer
W, var : Integer
Wh, varh: ×10
W, var : ×10
Wh, varh: ×100
Range in which
setting is prohibited
W, var : 2nd decimal place
Wh, varh: 1st decimal place
Primary current setting (A)
W, var : 3rd decimal place
Wh, varh: 2nd decimal place
W, var : 2nd decimal place
Wh, varh: 1st decimal place
W, var : Integer
Wh, varh: ×10
W, var : ×10
Wh, varh: ×100
Primar
y
volta
g
e settin
g
(
V
)
Range in which
setting is prohibited
W, var : ×100
Wh, varh: ×1000
Primar
y
volta
g
e settin
g
(
V
)
W, var : 1st decimal place
Wh, varh: Integer