Energy Measuring Module

3.1 Precautions for Operating Environment and Conditions

⚠️ Danger

Do not use this product in the places listed below. Failure to follow the instruction may cause malfunctions and a life decrease of product.

• Places the Ambient temperature exceeds the range 0 – 55°C.
• Places the Relative humidity exceeds the range 5 – 95% or places with dewfall.
• Altitude exceeds 2000 m.
• Places exposed to rain or water drop.
• Dust, corrosive gas, saline and oil smoke exist.
• Vibration and impact exceed the specifications.
• Installed excluding the control panel.

3.2 Matters concerning the preparation before use

• Use the module in the specified usage environment and conditions.
• The setting of this module phase system, primary voltage, primary current necessary before using it. Please refer to "User's Manual (Details)" about each setting method.

3.3 Installation and Wiring Precautions

⚠️ Danger

Shut off the external power supply for the module in all phases before installing or wiring. Failure to do so may cause an electric shock or damage of the module.

⚠️ Caution

• Any person who is involved in the installation and the wiring of this Sequencer should be fully competent to do the work.
• Use the programmable controller in an environment that meets the general specifications in the User's Manual for the CPU module used. Failure to do so may result in electric shock, fire, malfunction, or damage to or deterioration of the product.
• To mount the module, while pressing the module-mounting lever located in the lower part of the module, fully insert the module fixing projection(s) into the hole(s) in the base unit and press the module until it snaps into place. Incorrect mounting may cause malfunction, failure or drop of the module.
• When using the Sequencer in an environment of frequent vibrations, fix the module with a screw. Tighten the screw within the specified torque range. Under tightening can cause drop of the screw, short circuit or malfunction. Over tightening can damage the screw and/or module, resulting in drop, short circuit, or malfunction.
• Shut off the external power supply for the system in all phases before mounting or removing the module. Failure to do so may result in damage to the product.
• Do not directly touch any conductive part of the module. Doing so can cause malfunction or failure of the module.
• FG terminal must be grounded according to the D-type ground (Type 3) dedicated for sequencer. Failure to do so may result in an electric shock or a malfunction.
• When using this product, make sure to use it in combination with current sensor (EMU-CT series or EMU2-CT5). Please not to exceed the ratings of this product for input of current sensor. For further details, please refer to current sensor manual to maintain the functionality and the accuracy of this product.
• The dedicated current sensor (EMU-CT50/CT100/CT250/CT400/CT600) is used only for low voltage circuit. It cannot be used with a high voltage circuit. Also, EMU2-CT5 should be used with the secondary side (5 A) of transformer transfixed. In case directly using for the circuit, only the circuit up to 200V can be used. If it is connected with a high-voltage circuit by mistake, it may cause a burnout of the device and a fire. It is critically dangerous.
• The dedicated current sensor has a polarity (directionality). Be careful about it when installing the module.
• Take care not entering any foreign objects such as ships and wire pieces into the module. It may cause a fire, a failure or a malfunction.
• In order to prevent the module from incoming foreign objects such as wire pieces during wiring work, a foreign-object preventive label is placed on the module. While a wiring work is performed, keep the label on the module. Before operating the system, peel off the label for heat release. If the foreign-object preventive label is not peeled and the system is in use, residual heat inside the module may reduce the product life.
• The wires to be connected to the module shall be placed in a duct or fixed together by clamping. If the electric wires are not placed in the duct or clamped together, loosen wires or their movement or careless stretch may cause a breakage of the module or wire or a malfunction due to poor contact of electric wires.
• Use appropriate size of electric wires. If inappropriate size of electric wire is used, it may cause a fire due to generated heat.
• In case using stranded wire, take measures so that the filament should not vary by using a bar terminal or by processing the point twisted. Use the bar terminal appropriated for the size of electric wires. If inappropriate bar terminal is used, a wire breakage or a contact failure may occur, which may cause a device malfunction, a failure, a burnout, or a fire.
• After inserting the electric wire or a bar terminal, make sure that no missing insertion is existing. Missing insertion may cause a device malfunction, a fire, or an electric shock.
• If the wires connected to the module are strongly pulled off, it may cause a malfunction or a breakage to the module or the wire.
• Ensure the wiring to the module properly, checking the rated voltage and current of the product and the terminal pin assignment. If the input voltage exceed the rated voltage or the wiring is improper, it may cause a fire or a breakage. (Tensile load: 22N or less)
• Do not exceed the specified voltage when doing an insulation resistance test and a commercial frequency withstand voltage test.

3.4 Precautions for Start-up and Maintenance

• Use the product within the ratings specified in this manual. If it is used outside the ratings, it may cause not only malfunction or failure but also fire or burnout.
• Before operating the product, check that active bare wire, etc. does not exist around the product. If any bare wire is found, stop the operation immediately, and take an appropriate action such as isolation protection.
• Do not disassemble or modify the module. It may cause failure, malfunction, injury or fire.
• Attaching and detaching the module must be performed after the power source is shut off for all outside phases. If all phases are not shut off, it may cause electric shock, failure or malfunction of the module.
• Do not touch powered wires. It may cause malfunction.

⚠️ Caution

• Tighten mounting screws and cleaning module must be performed after the power source is shut off for all outside phases. If all phases are not shut off, it may cause electric shock, failure or malfunction of the module.
• Use a soft dry cloth to clean off dirt of the module surface.
• Do not let a chemical cloth remain on the surface for an extended period of time nor wipe the surface with thinner or benzene.
• Check for the following items to use this module properly for long time.

Daily maintenance:

• (1) No damage on this module
• (2) No abnormality with LED indicators
• (3) No abnormal noise, smell or heat.

Periodical maintenance (Once every 6 months to 1 year):

• (4) No looseness with installation, wire connection to terminal blocks, and connector connection. (Check these items under the electric outage condition.)

3.5 Disposal Precautions

When disposing of this module, treat it as industrial waste.

4.1 Names and functions of parts of QE81WH

Diagram shows the front panel of the QE81WH module. Key components are labeled:

• (1) LEDs: Display operation status and errors. (Refer to 7-4.)
• (2) Current input terminals: Connect the current wire of the measuring circuit with the secondary output of the dedicated current sensor.
• (3) Voltage input terminals: Connect the voltage input wire of the measuring circuit.
• (4) Strip gauge: A gauge used for checking the length of stripped wire.
• (5) Push button: Used to insert or remove a cable to the terminal.
• (6) Check hole: Used for continuity check to the terminal with a tester contact.

Names of signals of terminal block

Supplementary: Check the stripping length using the strip gauge of this module.

4.2 Names and functions of LEDs

The following describes names and functions of LEDs.

^*1For details, check with the list of error codes. (Refer to section 9.1)

5.1 How to attach to the base unit

Diagram shows the process of attaching the QE81WH module to a base unit. It illustrates inserting the module's fixing protrusion into the base unit's hole, pushing it until it clicks, and checking for secure insertion. A lever for attaching the module is also shown.

• Attach to the base unit of MELSEC-Q series.
• When attaching the module, make sure to insert the protruding portions for fixing the module into the holes on the base unit. In doing so, insert it securely so that the protruding portion of the module does not come off of the holes. Do not force to attach the module; otherwise the module may break.
• When installing the module at a vibrating area with strong impact, tighten the module to the base unit using screws.
• Fixing-Module screw (arranged by user): M3 x 12mm
• Tightening torque of the fixing-module screws: 0.36 – 0.48 N·m

6.1 Wiring

Follow the wiring diagram for external connection of QE81WH. When using this product, make sure to use it in combination with current sensor (EMU-CT series or EMU2-CT5). See the User's Manual (Details) of this unit, and the installation method and the detailed specifications of the current sensor.

Three-phase 3-wire (split current sensor)

Diagram shows the QE81WH module connected to a power source and a load. It features an EMU-CT*** model split current sensor (50/100/250/400/600). Terminal connections for 1k, 1I, 3k, 3I, P1, P2, P3, FG are illustrated.

Single-phase 3-wire

Diagram shows a single-phase, 3-wire connection for the QE81WH module, illustrating power source and load sides. Terminal connections are shown.

Three-phase 3-wire (with the voltage transformer for gauge/current transformer)

Diagram depicts a three-phase, 3-wire setup using an EMU2-CB-Q5A 5A current sensor cable and an EMU2-CT5 current sensor. A voltage transformer for gauge is also shown. It includes a note: "*For a low voltage circuit, grounding of the secondary sides of VT is not necessary."

Single-phase 2-wire

Diagram illustrates a single-phase, 2-wire connection for the QE81WH module, showing power source and load sides with terminal connections.

⚠️ Caution

• Input signal wire shall not be bound together with or placed close to the main circuit and power line. Keep 300 mm or longer distance between them.
• The input wiring of the measurement circuit uses other signals cable and separate cables, and do not be affected by serge and the instruction of the interchange side.
• For the actual usage, connect the FG terminal to ground. (D-type ground: Type 3) Connect it directly to the ground terminal.
• Do not connect to FG terminal during the insulation resistance test and pressure test.

Wiring Notes:

• Make sure that before connecting the cable, the orientation of the current sensor is correct for attachment. K to L is the correct direction. K: power source side, L: load side.
• If a 440 V or higher circuit is used, use a transformer. The available transformer ratio is 220/110 V to 6600/110 V. For connection to P1 to P3 terminals on QE81WH, connect the secondary of transformer. Make sure that terminal symbols are correct.

6.2 How to connect wires

• Use appropriate electric wires as described below.
• Stripping length of the used wire in use has to be 10 to 11mm. Check the stripping length using the strip gauge of this module.
• When stranded wire is used, a bar terminal must be used.
• When attaching and detaching cables to/from the terminal, use the push button. Check that the wire is securely inserted.
• Insert a wire to the terminal all the way until it touches the end.

Applicable wire (Usable electric wire)

• Single wire: 0.5 – 1.2mm² (AWG24–AWG17)
• Stranded wire: 0.5 – 1.3mm² (AWG20–AWG16)
• UL/c-UL listed corresponds, use the wires according to the following conditions:
• Single wire : AWG24–AWG18
• Stranded wire : AWG20–AWG18
• 60/75°C copper conductor only.

Câble applicable (Fil électrique utilisable)

• Câble simple: 0.5-1.2mm² (AWG24–AWG17)
• Câble brin: 0.5-1.3mm² (AWG20–AWG16)
• Pour être conforme à UL/c-UL standard, utilisez le fil électrique selon les conditions suivantes.
• Câble simple : AWG24–AWG18
• Câble brin : AWG20–AWG18
• Seulement le conduit en cuivre 60 °C /75 °C

Recommended bar terminal

TGV TC-1.25 -11T (NICHIFU TERMINAL INDUSTRIES CO.,LTD)