KW2G Eco-POWER METER (Discontinued)

Rating/ Performance

Measurement items
Power measurement (for AKW2010GB, AKW2020GB, AKW2110GB and AKW2160GB)

*1

KW2G / KW2G-H can measure regeneration electric power. Integrated electrical power is not integrated (not subtracted) when detecting regeneration electric power.

*2

While detecting regeneration electric power, minus is displayed on instantaneous active electric power and power factor.

*3

Eco-POWER METER is designed chiefly to manage saving energy. It is neither intended nor can it be legally used for billing.

*4

Displayed digit of pulse counter differs according to the pre-scale set by pre-scale setting mode.

Pulse input (for AKW2152G)

* The number of displayed digit of pulse count value differs according to the pre-scale set by pre-scale setting mode.

Analog input (for AKW2182G)

* The number of displayed digits of the converted digital values differs according to the preset decimal point position.

Hour Meter (excluding AKW2182G)

*1

Excluding AKW2152G

*2

Maintenance time by using pulse input cannot be measured with AKW2110GB or AKW2160GB

*3

Hour meter function can be used only with main unit and one expansion unit.

Accuracy (for AKW2010GB, AKW2020GB, AKW2110GB and AKW2160GB)

General specifications

Communication specifications

*1

For RS-485 converter on the computer side, we recommend SI-35 and SI-35USB (from LINE EYE Co.,Ltd.).

*2

When using SI-35, SI-35USB or PLC from our company (which can be connected up to 99 units), up to 99 Eco-POWER METER can be connected.
In case using this system with the other devices, up to 31 Eco-POWER METER can be connected.

*3

Please check with the actual devices when some commercial devices with RS-485 interface are connected. The number of connected devices, transmission distance, and transmission speed may be different according to using transmission line.

*4

With Modbus RTU protocol, it works only with 8-bit.

*5

When using the USB port, install the dedicated USB driver.

Pulse input specifications (for AKW2010GB, AKW2020GB and AKW2152G)

Analog input specifications (for AKW2182G)

*

Digital conversion value differs according to the scaling conversion value set by setting mode.
If the analog input value exceeds the upper or lower limit, the digital value will preserve the upper or lower limit.

Pulse output (Transistor output) specifications
(for AKW2010GB, AKW2020GB and AKW2160GB)

*1

General-purpose output (OUT) and Error alarm (Error) are possible using main unit software AKW2010GB Ver. 1.05 or later and AKW2020GB Ver. 1.02 or later and expansion unit software AKW2160GB Ver.1.01 or later.

*2

The min. pulse output cycle is 25ms in order to work correctly and output 1 to 10ms pulse output.

*3

These count output specifications are only for the main unit and expansion unit AKW2160GB.

The pulse output unit should be set as that it output 40 pulses or less in 1 second.
[How to calculate]
Unit for pulse output: PL-P > Max. measurement power (kW) / 3,600 sec × 40 pulse/sec
When the pulse output unit is 0.001, the maximum power that can be properly measured by pulse output is 144 kW (3,600 sec × 40 pulse/sec × 0.001).

Note:

(1) Count errors may occur if the pulse output is set to 40 pulses or more per 1 second.

(2) If the pulse output OFF time is set too short, count errors by connected counters, PLCs (Programmable Logic Controllers) may occur.

DEDICATED CURRENT TRANSFORMER (CT)

Specifications

Notes :

1)

Dedicated CT are dedicated for low voltage under 440 V AC system. They can not be used for high voltage circuit.

2)

In each type of Eco-POWER METER excluding AKW8115, KW9M and KW2M, a combination of commercially secondary side 5 A CTs and dedicated CTs for 5 A is used for measuring high voltage circuits; For details, confirm with each respective user's manual.

3)

Since dedicated CTs cannot be used when measuring with AKW8115, KW9M and KW2M, please be careful and do not purchase a dedicated CT by mistake.

4)

For the AKW8115, KW9M and KW2M, CT with a secondary side current 1 A or 5 A is recommended. Please confirm the specification beforehand.

5)

Dedicated CT are not included with Eco-POWER METERs.

6)

Each dedicated CT includes a 1 m 3.281 ft relay cable, respectively.

Dimensions

• Unit: mm in

KW2G

(Main unit) AKW2010GB

(Expansion unit)AKW2110GB/AKW2160GB/AKW2152G/AKW2182G

Dedicated current transformers CT

Dedicated current transformer (CT) Clamp-on type 5A/50A (AKW4801B)

Dedicated current transformer (CT) Clamp-on type 100A (AKW4802B)

Dedicated current transformer (CT) Clamp-on type 250A (AKW4803B)

Dedicated current transformer (CT) Clamp-on type 400A (AKW4804B)

Dedicated current transformer (CT) Clamp-on type 600A (AKW4808B)

Dedicated current transformer (CT) Through type 50A/100A (AKW4506B)

Dedicated current transformer (CT) Through type 250A/400A/600A (AKW4507B/AKW4508B)

Terminal arrangement

Be sure to wire correctly according to the terminal arrangement and wiring diagrams.
After completing wiring, be sure to attach the terminal cover for safety reasons.

Main unit

Expansion unit (Power measurement and Pulse output : AKW2160GB)

Expansion unit (Pulse input : AKW2152G)

Expansion unit (Analog input : AKW2182G)

Wiring diagrams

Single-phase two-wire system
* One dedicated current transformer (CT) is required for one load.

Single-phase three-wire system / Three-phase three-wire system
* Two dedicated current transformers (CT) are required for one load.

Caution for Wiring

• 1.Terminal fastening torque should be 0.5 to 0.6N･m for M3 screw and should be 0.8 to 1.0N･m for M3.5 screw. In case of using a crimping terminal, use it with insulating sleeve applicable to M3 screw or M3.5 screw.
• 2.To protect the device, it is necessary to install power switch and circuit breaker in the power supply circuit. And this has no built-in power switch, circuit breaker or fuse for measured voltage input parts. Therefore it is necessary to install them in the circuit near this unit.
• 3.We recommend a wire with the cross section of 0.75 to 1.25mm² for power supply line and measured voltage input line.
• 4.Use with 10m or less of the input line and 100m or less of the output line.
• 5.Use flame-resistant cable for each wiring.

Discontinued products [Order accepted till December, 2016]

(Main unit) AKW2010G

(Expansion unit) AKW2110G/AKW2160G

Dedicated current transformer (CT) Clamp-on type 5A/50A (AKW4801C)

Dedicated current transformer (CT) Clamp-on type 100A (AKW4802C)

Dedicated current transformer (CT) Clamp-on type 250A (AKW4803C)

Dedicated current transformer (CT) Clamp-on type 400A (AKW4804C)

Dedicated current transformer (CT) Clamp-on type 600A (AKW4808C)

Dedicated current transformer (CT) Through type 50A/100A (AKW4506C)

Dedicated current transformer (CT) Through type 250A/400A/600A (AKW4507C/AKW4508C)

Cautions For Use

*Please refer to each manual for the precautions in using.

Avoid locations subject to flammable or corrosive gases, excessive dust, oil, vibrations, or excessive shocks.

Although the case is made from fireproof resin, do not mount it next to flammable materials. Also, avoid placing it directly on top of materials that catch fire easily.

Since the cover for main unit is made of polycarbonate resin, avoid contact with or use in environments containing methyl alcohol, benzene, thinners, and other organic solvents; and ammonia, caustic sodas, and other alkaline substances.

This product is designed to be used only with our options. Options from other companies are not compatible.

Measurement

• Accurate measurement may not be possible if harmonics or waveforms are distorted. Therefore, please test on actual equipment before using.
• Do not use the secondary circuit of the inverter. It causes heat and malfunctions in the main unit.

Surge

• If the operating power supply surge exceeds the following value, the internal circuit could be destroyed, so be sure to use a surge absorption element.

The values in the graph are the surge-voltage resistance at ±(1.2 × 50) μs of single-polarity full-wave voltage.
Surge wave form [±(1.2/50) μs single-polarity full-wave voltage]

• External noise up to the level shown below is treated as noise voltage, but levels higher than this could lead to malfunctioning or damage to the internal circuit.

Noise wave form (noise simulator)
Rise time: 1 ns Pulse width: 1 μs, 50 ns
Polarity: ± Cycle: 10 ms
(Note 1): Accurate measurement may not be possible if excessive noise gets added to the input line.

Self-diagnostic function

If an error occurs, the following displays will be given.

(Note 2):

Includes the possibility that the EEPROM's life has expired.

Power failure memory

• Eco-POWER METER memories integrated electric power and working status to internal EEPROM until when power supply is off. (Power failure guarantee)
  And every time to change each setting, each setting value is memorized to internal EEPROM at the same time. Therefore, change setting frequently makes EEPROM's life short. Avoid to usage like this.

Others

• Eco-POWER METER is designed chiefly to manage saving energy. It is neither intended nor can it be legally used for billing.

Wiring

Please make sure to check wiring in dimensions page in each product page.

Note:

Please connect a breaker (3 to 15A) to the voltage input part for safety reasons and to protect the device. Grounding the secondary side of VT (Voltage transformer) and CT (Current transformer) is not necessary with low-voltage circuit.

Regarding dedicated current transformers(In AKW8115, dedicated current transformers are not used,therefore, please confirm the respective user's manual.)

HOW to attach the Current Transformer (CT)

• In case the Eco-POWER METER has connectors for CT, connect to the Eco-POWER METER as it is.
• In case the Eco-POWER METER has screw terminals for CT (KW4M and KW8M), cut the connector for Eco-POWER METER side. Refer to the below.

<Process drawings>

• The below number of CT is required.
  For single-phase, two-wire system; 1 pc.
  For single-phase, three-wire system; 2 pcs.
  For three-phase, three-wire system; 2 pcs.
  For three-phase, four-wire system; 3 pcs.
  All using CT for one Eco-POWER METER should have the same rating.
• Check beforehand that the thickness of the load electric wire is smaller than the through hole of the CT.
• Do not attach CT to the part which a conductor is exposed, such as a bus bar in a control box.
  It might cause an electric shock.
• When connecting CT, connect the secondary side to the terminal of the Eco-POWER METER first, and after that wire the primary side to a load electric wire. Incorrect order might cause an electric shock or break CT.
• CT has polarity. Align according to the direction (K → L) written on the CT and install from the power source side (K) facing the load side (L). If the direction is incorrect, accurate measurement is impossible.
• When installing and closing CTs, please confirm there is no dust or foreign matter on the separating surfaces. In addition, verify that the separating surfaces are making perfect contact when the CT is closed. Measurement errors will occur if there is a gap in the separating surfaces. (Only Clamp-on type)
• If there is some distortion by harmonic or waveform, it may not measure correctly. Please check with the actual system before adopting it.
• Separate the wiring (strong electric part) of the measured voltage input terminal (operating power supply terminal) from the CT cable. It may not satisfy the accuracy due to noise.

When CT's cable is extended

• Extension of the cable is possible up to approximately 10 m 32.808 ft if the environment is completely free from noise such as external and line induction noise, and the cable has a thickness of at least 0.75 mm². When extending the cable, use as thick a cable as possible.
  *When extending the cable, please perform testing under actual conditions before using.

To connect CT with secondary side current 5 A

How to connect for measuring by combination with CT (secondary side current 5 A)

• Select 5 A at CT type setting mode (CT-T).
• Set the primary current of measured CT (secondary side current 5 A) at primary side current of CT setting mode (CT-1). If the measured CT is 400 A / 5 A, set to "400".
• Clamp the dedicated CT for 5 A, which is connected to the main unit first, to secondary side of the CT. CT direction (K → L) should be set for the CT direction.
• Please set the CT (secondary side current 5 A CT) and, the dedicated CT for 5A, approximately 1 m 3.281 ft apart. If the two CTs are set too close each other, it may not measure accurately due to magnetic field interference.

(Connection example)
With ammeter etc.

Without ammeter

Input connection [except AKW7111B and AKW1110B]

• Contact input
  Use highly reliable metal plated contacts. Since the contact's bounce time leads directly to error in the count value, use contacts with as short a bounce time as possible. In general, select 30 Hz for max. counting speed.
• Non-contact input (Transistor input)
  Connect with an open collector. Use the transistor with the following specifications.
  V_CEO=min. 20 V, I_C=min. 20 mA, I_CBO= max. 6 μA
  Use transistors with a residual voltage of less than 1.5 V when the transistor is ON.

Note:

Short-circuit impedance should be less than 1 kΩ. (When the impedance is 0 Ω, drain current is approx, 7 mA. The opencircuit impedance should be more than 100 KΩ.)

• Input wiring
  Please use shielded wire or metal wire-ways exclusively and a wire length of 10 m 32.808 ft or less. If the wiring length is longer, the impact due to floating capacitance may result in abnormal operation.

Note:

Operating power supply input part and measured voltage input are not insulated to pulse input parts.So the input equipment must have the power supply transformer in which the secondary side is not grounded with the primary and secondary sides insulated, in order to prevent interference of the power supply circuit when connecting the external input circuit. Be sure not to use an auto-transformer.

Output connection

Since the transistor output is insulated from the internal circuit by a photo-coupler, it can be used both as a NPN output and PNP (equal value) output.

Crimping terminal

please make sure to check crimping terminal in dimensions page in each product page.

Low Voltage Directive

When using in the application confirming to EN61010-1/IEC61010-1, make sure to satisfy the following conditions.

(1)

Pulse output part secure only basic insulation. In order to secure reinforced (double) insulation demanded by EN 61010-1/ IEC61010-1, secure basic insulation or more with load side and reinforced (double) insulation with communication system side.

(2)

Provide the voltage input part with an EN60947-1 or EN60947-3 compliant circuit breaker. The breaker that connects to the voltage input part must arrange at the position easily reached, and display shows it is the breaker of the equipment.

(3)

Use a wire with basic insulation or more for a wire cramped (or connected) CT.

【Environmental conditions】

• Overvoltage category II, Pollution degree 2
• Indoor use
• An ambient temperature of –10 to 50℃
• An ambient non-condensing humidity of 35 to 85%RH (at 20℃)
• Altitude of 2000m or less

【Mount the product in a place with】

• A minimum of dust, and an absence of corrosive gases
• No flammable, explosive gasses
• Few mechanical vibrations or shocks
• No exposure to direct sunlight
• No large capacity electromagnetic switches or cables through which large current is flowing