Business > Industrial Devices > Automation Controls Top > FA Sensors & Components > Energy Management Solutions > Eco Series (Simple Watt-Hour Meter/ Simple Power-On Counter/ Power-On Hour Meter) > KW2G Eco-POWER METER > Rating/ Performance

KW2G Eco-POWER METER

Discontinuation plan

	September 30, 2024

Rating/ Performance

Rating/ Performance

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

Item		Unit	Data display range
Integrated electric power (Active)^*1		kWh/MWh	0.00 to 9999.99 kWh to 9999.99 MWh, 0.00 to 9999999.99 kWh (when 9-digit display)
Instantaneous electric power	Active^*2	kW	−9999.99 to 0.000 to 9999.99
	Reactive^*2	kvar	−9999.99 to 0.00 to 9999.99
	Apparent	kVA	0.00 to 9999.99
Current	R-current	A	0.000 to 6000.00
	N/S-current	A	0.000 to 6000.00 (calculated value)
	T-current	A	0.000 to 6000.00
Voltage	R (RS)-voltage	V	0.0 to 9999.9
	S (RT)-voltage	V	0.0 to 9999.9 (calculated value)
	T (TS)-voltage	V	0.0 to 9999.9
Electricity charge^*3			0.00 to 999999
Conversion carbon dioxide value		kg-CO₂	0.00 to 999999
Power factor^*2		Displayed on the main unit	−1.00 to 1.00 (without identify leading phase and lagging phase)
Frequency		Hz	47.5 to 63.0
Pulse counter^*4			0 to 999999

*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.

*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)

Item	Data display range
Pulse counter value^*	0 to 999999

* 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)

Item	Data display range
Converted digital value^*	−999999 to 9999999

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

Hour Meter (excluding AKW2182G)

Item	Unit	Data display range
OFF-time^*1	h(Hour)	0.0 to 99999.9
ON-time1^*1
ON-time2^*1
Maintenance-time^*2
Actual-hours
Rate of ON-time1^*1	%	0.0 to 100.0
Rate of ON-time2^*1	%	0.0 to 100.0

*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)

Item		Specifications
Accuracy (without error in CT and VT)	Instantaneous electric power, Integrated electric power, Electricity charge and Conversion value	Within ± (2.0 % F.S. + 1 digit) (at +20 ℃ +68 ℉, rated input, rated frequency, power factor 1) *Accuracy coverage: 10 to 100 % of rated current
	Current	Within ± (1.0 % F.S. + 1 digit) (at +20 ℃ +68 ℉, rated input, rated frequency, power factor 1) *Accuracy coverage: 10 to 100 % of rated current
	Voltage	Within ± (1.0 % F.S. + 1 digit) (at +20 ℃ +68 ℉, rated input, rated frequency, power factor 1)
	Temperature characteristics	Within ± (1.0 % F.S. + 1 digit) (Range of -10 to +50 ℃ +14 to +122℉, rated input, power factor 1)
	Hour meter	±(0.01% +1 digit) Monthly accuracy: ±280 sec. (at +20℃ +68℉)
	Frequency characteristics	Within ± (1.0 % F.S. + 1 digit) (Frequency change ± 5 % based on rated frequency, rated input, power factor 1)

General specifications

Item	Specifications
Rated operating voltage	100 to 240 V AC (Add to main unit)
Rated frequency	50 / 60 Hz common
Rated power consumption	Main unit: 6 VA, Expansion unit (Power measurement, Power measurement and Pulse output, and Analog input): 0.5 VA / unit, Expansion unit (Pulse input): 1.0 VA /unit (240 V AC at +25 ℃ +77 ℉)
Allowable operating voltage range	85 to 264 V AC (85 % to 110 % of rated operating voltage)
Allowable momentary power-off time	10 ms
Ambient temperature	-10 to +50 ℃ +14 to +122 ℉ (-25 to +70 ℃ -13 to +158 ℉ at storage)
Ambient humidity	30 to 85 % RH (at +20 ℃ +68 ℉) non-condensing
Display method	LCD with backlight (green), Upper: 5-digit (7-segment 1-digit + 16-segment 4-digit), Lower: 6-digit (7-segment)
Number of connectable expansion units	Max. 7 units
Power failure memory method	EEPROM (more than 1,000,000 overwrite), Memory items: setting value and integral measuring value
Weight	Main unit (Standard type): 180 g approx. Main unit (SD card type): 185 g approx. Expansion unit (Power measurement): 80 g approx. Expansion unit (Power measurement and Pulse output, Pulse input and Analog input): 85 g approx.

Communication specifications

Item	Specifications
Item	RS-485 communication	USB communication^*5
Protocol	MEWTOCOL / Modbus RTU (selectable with setting mode)	-
Transmission function	-	Computer link (MEWTOCOL)
Isolation status	Isolated with the internal circuit	Isolated with the internal circuit
Number of connected units	99 units Max.^12	-
Transmission distance	1200 m 3.937 ft Max.^*3	-
Transmission speed	2,400 / 4,800 / 9,600 / 19,200 / 38,400 / 57,600 / 115,200 bps (selectable with setting mode)	12 Mbps (Full-speed)
Transmission format	Data length: 8-bit / 7-bit (selectable with setting mode)^*4 Parity: Not available / Odd number / Even number (selectable with setting mode) Stop bit: 1-bit / 2-bit (selectable with setting mode)	-
Communication method	Half-duplex	-
Synchronous system	Synchronous communication method	-
Ending resistance	120 Ω approx. (built-in)	-

*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)

Item		Specifications
Input mode		Addition (Fixed)
Max. counting speed		50 kHz / 30 Hz (Select with setting mode)
Pulse input (Min. input signal width)		0.01 ms (When 50 kHz selected) / 16.7 ms (When 30 Hz selected), ON : OFF ratio = 1 : 1
Input signal		Contact / No contact (open collector) • Impedance when shorted: Max. 1 kΩ • Residual voltage when shorted: Max. 2 V • Impedance when open: Min. 100 kΩ
Output mode		HOLD (Over count)
Prescale	Decimal point	Setting possible up to under 3-digit
Prescale	Range	0.001 to 100.000 (Set with setting mode)

Analog input specifications (for AKW2182G)

Item		Specifications
Number of input points		2 channels
Input range (Select with setting mode)	Voltage	0 to 5 V / 1 to 5 V
Input range (Select with setting mode)	Current	0 to 20 mA / 4 to 20 mA
Converted digital value		0 to 4000 (decimal number)^*
Resolution		1/4000 (12 bits)
Overall precision		±1 % F.S. or less (-10 to 55 ℃ +14 to 131 ℉ )
Input impedance	Voltage	440 kΩ
Input impedance	Current	125 Ω
Absolute maximum input	Voltage	- 0.3 to +10 V
Absolute maximum input	Current	- 2 to + 30 mA
Input protection		Diode

* 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.

*	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)

Item	Specifications
Number of output point	1 point
Insulation method	Photo coupler
Output type / Output capacity	Open collector / 100 mA 30 V DC
Pulse width (when pulse output with integrated active electric power selected)	1 to 100 ms (selectable with setting mode)
ON state voltage drop	1.5 V or less
OFF state leakage current	100 μA or less
Pulse output unit^*1	0.001 kWh, 0.01 kWh, 0.1 kWh, 1 kWh, 10 kWh, 100 kWh / Power alarm(AL-P) / Current alarm(AL-C) / Stand-by power alarm(AL-S) / Counter(Cnt) / General purpose output(OUT) / Error alarm(Error) (selectable with setting mode)
General purpose output	Level output / Repeat cycle output / One-shot output (selectable with setting mode)
Output ON-time, Output OFF-time	0.1 to 10.0 sec. (selectable with setting mode)

*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	For normal operation of other functions, to switch on minimal pulse width of 1 to 10 ms, the maximum pulse output interval is 25 ms. Consequently, a minimum measurable pulse unit output setting of 40 pulses or less per 1 second is recommended.

[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.

*3	These count output specifications are only for the main unit.

DEDICATED CURRENT TRANSFORMER (CT)

Specifications

Item	Clamp-on typ
Item	AKW4801B AKW4801C	AKW4802B AKW4802C	AKW4803B AKW4803C	AKW4804B AKW4804C	AKW4808B AKW4808C
CE marking directive compliance	Low Voltage Directive, RoHS Directive
Primary side rated current	5A/50A	100A	250A	400A	600A
Secondary side rated current	1.67mA/16.7mA	33.3mA	125mA	200mA	200mA
Winding (Turn)	3000	3000	2000	2000	3000
Ratio error	±2.0%F.S.
Through hole	ø10 ø0.39	ø16 ø0.63	ø24 ø0.94	ø36 ø1.42	ø36 ø1.42
Breakdown voltage (initial)	1000V AC/1min (Between through hole and output lead wire)		2000V AC/1min (Between through hole and output lead wire)
Insulation resistance (initial)	Min. 100 M Ω (at 500 V DC) (Between through hole and output lead wire)
Functional vibration resistance	10 to 55 Hz (1 cycle / min), single amplitude: 0.15 mm 0.01 in (10 min on 3 axes)
Vibration resistance	10 to 55 Hz (1 cycle / min), single amplitude: 0.375 mm 0.01 in (1 hour on 3 axes)
Functional shock resistance	Min. 98m/s²(4 times on 3 axes)
Shock resistance	Min. 294m/s²(5 times on 3 axes)
Output protection level	±7.5 V with clamp element		±3.0V with clamp element
Permissible clamping frequency	100 times approx.
Ambient temperature range	-10 to +50℃ +14 to +122 ℉ (without frost and non-condensing)
Storage temperature	-20 to +60℃ -4 to +140 ℉ (without frost and non-condensing)
Ambient humidity	35 to 85%RH（at +20℃ +68 ℉ non-condensing）
Dimensions (mm in) (W x H x D)	23 x 40 x 26.5 0.08 x 0.13 x 0.09	30 x46.5 x 32 0.10 x 0.15 x 0.11	45 x65 x 34 0.15 x 0.21 x 0.11	57 x81 x 38 0.19 x 0.27 x 0.12	62.6 x93.3 x 40 0.21 x 0.31 x 0.13
Weight (Relay cable included)	60 g approx.	90 g approx.	200 g approx.	295 g approx.	450 g approx.

Item	Through type
Item	AKW4506B AKW4506C	AKW4507B AKW4507C	AKW4508B AKW4508C
CE marking directive compliance	Low Voltage Directive, RoHS Directive
Primary side rated current	50A/100A	250A/400A	600A
Secondary side rated current	16.7mA/33.3mA	125mA/200mA	200mA
Winding (Turn)	3000	2000	3000
Ratio error	±1.0%F.S.
Through hole	ø17mm ø0.67 in	ø36mm ø1.42 in
Breakdown voltage (initial)	1000V AC/1min (Between through hole and output lead wire)）	2000V AC/1min (Between through hole and output lead wire)
Insulation resistance (initial)	Min. 100 MΩ (at 500 V DC megger) (Between through hole and output lead wire)
Functional vibration resistance	10 to 55 Hz (1 cycle / min), single amplitude: 0.15 mm 0.01 in (10 min on 3 axes)
Vibration resistance	10 to 55 Hz (1 cycle / min), single amplitude: 0.375 mm 0.01 in (1 hour on 3 axes)
Functional shock resistance	Min. 98 m/s² (4 times on 3 axes)
Shock resistance	Min. 294 m/s² (5 times on 3 axes)
Output protection level	±7.5 V with clamp element	±3.0 V with clamp element
Permissible clamping frequency	-
Ambient temperature range	–10 to +50 ℃ +14 to +122 ℉ (without frost and non-condensing)
Storage temperature	–20 to +60 ℃ –4 to +140 ℉ (without frost and non-condensing)
Ambient humidity	35 to 80 % RH (at +20 ℃ +68 ℉non-condensing)
Dimensions (mm in) (W x H x D)	ø42 x 15 1.65 x 0.05	ø70 x19 2.76 x 0.06	ø70 x19 2.76 x 0.06
Weight (Relay cable included)	70 g approx.	200 g approx.	215 g approx.

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.