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Discontinued
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KW8M Eco-POWER METER (Discontinued Products)

Rating/ Performance

Measurement items

Item Unit Data Display range
Integrated
electric
power
Active kWh 0.00 to 9999999.9
Reactive kvarh 0.00 to 9999999.9
Apparent kVAh 0.00 to 9999999.9
Instantaneous
electric
power
Active kW 0.00 to 9999999.99
Reactive kvar -99999.99 to 0.00 to 999999.99
Apparent kVA 0.00 to 9999999.99
Current CT1 - phase
current
A 0.0 to 6000
CT2 - phase
current
A 0.0 to 6000
CT3 - phase
current
A 0.0 to 6000
Voltage Voltage
between P1
and P0
V 0.0 to 9999
Voltage
between P2
and P0
V 0.0 to 9999
Voltage
between P3
and P0
V 0.0 to 9999
Electricity charge *1 - 0.0 to 99999999
Power factor Displayed
on the
main unit
0.00 to 1.00
(LEAD: Leading phase, LAG: lagging phase)
Communication -1.00 to 0.00 to 1.00
(Within the range of phase angle θ=-90 to 0 to 90 degree)
Frequency Hz 47.5 to 63.0
Hour meter ON-time hour 0.0 to 99999.9
OFF-time
Pulse counter - 0.0 to 99999999
Simple demand *2 Present demand kW 0.00~999999.99
Estimated demand kW 0.00~999999.99
Ratio of estimated demand % 0.0~9999.9
*1 Eco-POWER METER is designed chiefly to manage saving energy. It is neither intended nor can it be legally used for billing.
*2 Simple demand is the function only for AKW8111H. It doesn’t support pulse input.It supports only CT input (power measurement).
Please use this simple demand function as your standard. The time used in this function is the time set by Eco-POWER METER. Therefore it is different from the demand meter controlled by your power company.

Main unit

Item Specifications
Rated operating voltage 100 to 240V AC
Rated frequency 50/60Hz common
Rated power consumption 8VA(240 V AC at +25℃ +77)
Inrush current 30 A or less (200 VAC at +25℃)
Allowable operating voltage range 85 to 264 V AC (85 % to 110 % of rated operating voltage)
Allowable momentary power-off time 10ms
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)
Breakdown voltage (initial) Between the isolated circuits: 2000V for 1min
(measured with 500 V DC)
• Outer edge (case) ⇔ All terminals
• Between insulated circuits
• Operating power supply terminals ⇔ Analog input terminals (Note)
• Operating power supply terminals ⇔ Pulse input terminal (Note)
• RS485 communication terminals ⇔ All other terminals
• Pulse output terminals ⇔ All other terminals
Insulation resistance (initial) Between the isolated circuits:100MΩ or more
(measured at 500V DC)
Vibration resistance 10 to 55Hz (1cycle/min) single amplitude: 0.375mm 0.01 in(1hour on 3 axes)
Shock resistance Min. 294m/s2 (5 times on 3 axes)
Display method 8-digit, 7-segment LED
Power failure memory method EEP-ROM (more than 100,000 overwrite)
Size 48 × 96 × 98.5 mm
Weight*2 AKW8111: approx.235g AKW8111H: approx.250g AKW8115: approx.265g

Note : Analog input terminals: No.11 to 20 / Pulse input terminal: No.4 and 5

Electric power input specifications

Item Specifications
Measured
input voltage
Rating Single-phase two-wire: 0 to 440V AC (Line voltage)
Single-phase three-wire: 0 to 220V AC (Phase voltage)
Three-phase three-wire: 0 to 440V AC (Line voltage)
Three-phase four-wire: 0 to 254V AC (Phase voltage)
Allowance 85% to 120% of rated input voltage
Allowable measurement
voltage
Single-phase two-wire: 0 to 528V AC (Line voltage)
Single-phase three-wire: 0 to 264V AC (Phase voltage)
Three-phase three-wire: 0 to 528V AC (Line voltage)
Three-phase four-wire: 0 to 300V AC (Phase voltage)
VT ratio 1.00 to 99.99 (Set with setting mode)
*Voltage transformer (VT) is required when you measure a load with voltage over 440V system. (Secondary side: 110V)
Measured
input current
Primary side rating • 5A/50A/100A/250A/400A/600A (In case using dedicated CT.) (Select with setting mode)
• 1 to 4000A (Set with setting mode)
*Use a CT with secondary side current of 5A when measure 600A or more.
Special
functions
Cut-off current 1.0 to 50.0%F.S. (Select with setting mode)
Current threshold
for hour meter
1.0 to 100.0%F.S. (Select with setting mode)
Accuracy
(without error in CT and VT)
Instantaneous electric power(Active/Reactive/Apparent),
Integrated electric power(Active/Reactive/Apparent),
Electricity charge
AKW8111
AKW8111H
Within ± (2.0 % F.S. + 1 digit)
In case of 5 A CT mode, within ± (2.5 % F.S. + 1 digit)
(at +20 ℃ +68 , rated input, rated frequency, power factor 1)
*Accuracy coverage: 5 to 100 % of rated current
Instantaneous electric power
(Active/Apparent),
Integrated electric power
(Active/Apparent),
Electricity charge
AKW8115 Within ± (1.0 % F.S. + 1 digit)
(at +20 ℃ +68 rated input, rated frequency, power factor 1)
*Accuracy coverage: 5 to 100 % of rated curre
Instantaneous electric power
(Reactive),
Integrated electric power
(Reactive)
AKW8115 Within ± (2.0 % F.S. + 1 digit)
(at +20 ℃ +68 , rated input, rated frequency, power factor 1)
Current Within ± (1.0 % F.S. + 1 digit)
(at +20 ℃ +68 rated input, rated frequency, power factor 1)
*Accuracy coverage: 5 to 100 % of rated current
Voltage Within ± (1.0 % F.S. + 1 digit)
(at +20 ℃ +68 rated input, rated frequency, power factor 1)
Hour meter Within ± (0.01 % +1 digit) (at +20 ℃ +68 )
(In case power on start or current energizing: ± 0.01 % + 1 sec + 1 digit)
Temperature
characteristics
Within ± (1.0 % F.S. / +10 ℃ +50 + 1 digit)
In case of 5 A CT mode, within ± (1.5 % F.S. + 1 digit)(AKW8111, AKW8111H only)
(Range of -10 to +50 ℃ +14 to +122 , rated input, power factor 1)
Frequency
characteristics
Within ± (1.0 % F.S. + 1 digit)
In case of 5 A CT mode, within ± (1.5 % F.S. + 1 digit)(AKW8111, AKW8111H only)
(Frequency change ± 5 % based on rated frequency, rated input, power factor 1)

Pulse input specifications

Item Specifications
Input mode Addition (Fixed)
Max. counting speed 2kHz/30Hz (Select with setting mode)
Pulse input Min. input signal width:
0.25ms (When 2kHz selected)/
16.7ms (When 30Hz selected)
ON:OFF ratio = 1 : 1
Input signal

Contact/No contact (open collector)
Impedance when shorted: 1kΩ
Residual voltage when shorted: Max. 2V
Impedance when open: 100kΩ

Output mode HOLD (Over count)
Number of digit 8-digit (0 to 99999999)

Pulse output (Transistor output) Specifications

Item Specifications
Number of output point 1 point
Insulation method Optical coupler
Output type Open collector
Output capacity

100mA 30V DC

Pulse width Approx. 100ms
ON state voltage drop 1.5V or less
OFF state leakage current 100μA or less
Pulse output unit 0.001/0.01/0.1/1/10/100kWh/Alarm(AL-P)/
Current alarm(AL-C) /Stand-by alarm (AL-S) /Counter(Cnt)/
Demand alarm(DEM) (Selectable with setting mode)

* We recommend the setting of minimum unit for pulse output for measurement shown as below.
Output pulse: 4 pulse or less per 1sec.

[How to calculate]
(Unit for pulse output:PL-P)>(Max. measurement power [kW] / (3600[s]×4 [pulse/s])

Caution
(1) Improper unit setting may cause miss counting.
(2) If the OFF time is too short, there is a possibility of counting errors.

Communication Specifications

Item Specifications
Interface Conforming to RS485
Protocol MEWTOCOL/MODBUS(RTU)(selectable with setting mode)
Isolation status Isolated with the internal circuit
Number of connected units 99 (max.)*2 *3
Transmission distance 1200m (max.)*1
Transmission speed 38400/19200/9600/4800/2400bps (selectable with setting mode)
Transmission Format Data length 8bit/7bit (selectable with setting mode)*4
Parity Not available / Odd number / Even number (selectable with setting mode)
Stop bit 1bit (fixed)
Communication method Half-duplex
Synchronous system

Synchronous communication method

Ending resistance Approx. 120Ω (built-in)
Transmission line Twisted-pair cable with shield or VCTF
Communication mode 1 : N communication

*1 Please check with the actual devices when some commercial devices with RS485 interface are connected. The number of connected devices, transmission distance, transmission speed may be different according to using transmission line.
*2 For RS485 converter on the computer side, we recommend SI-35 and SI-35USB (from LINE EYE Co., Ltd.).
*3 When using SI-35,SI-35USB or PLC from Panasonic Industrial Devices SUNX (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.
*4 With MODBUS(RTU) protocol, it works only with 8bit.

Logging specifications (only for AKW8111H)

Item Specifications
Log function
Memory of main unit
Automatic
logging
Save cycle 60 min.
Save data Integrated active power, Integrated reactive power, Integrated apparent power
Save data amount Max. 2232 records *3 months
Display Integrated electric power by month, Integrated electric power by day, Integrated electric power by hour
Selected
logging*1
Save cycle 1, 5, 10, 15, 30, 60 min.
Save data

Integrated active power, Integrated reactive power, Integrated apparent power, Instantaneous voltage,
Instantaneous current, Pulse count value

Save data amount Max. 2160 records *1.5 days (when save frequency is 1 min.)
Calendar timer function Time accuracy monthly accuracy: 240 sec. (at –10℃)
monthly accuracy: 70 sec. (at 25℃)
monthly accuracy: 240 sec. (at 50℃)
Arbitrary integrated active power

Integrated active power in arbitrary time Display range: 0.00 to 9999999.9 kWh

Content of battery backup Time measurement and log data retained
Battery life*2 *3 About 5 years (at ambient temperature 25℃)

*1

Another software is required to check selectable log data saved in the built-in memory. The recommended software, KW Monitor, is available for download from here.

*2 When battery power is reduced, “E” is blinking. Please change the battery according to the battery replacement procedure.
*3 Battery life will shorten if this product is used in high temperature environments.

Simple Demand specifications (only for AKW8111H)

Demand span 30 minutes span fix
Span system synchronized with the main unit clock
Data update cycle 1 minute
Measurement item Present demand (update every 1 second),
Estimated demand (update every 1 minute)
Remaining time (update every 1 minute)
Display Present demand, Estimated demand, Demand setting value
Remaining time
Ratio of estimated demand
Demand log, Monthly max. demand log
Saved date (main unit memory) Demand log 336 records (7 days)
Monthly max. demand log 13 records (13 months)
Demand alarm * Indication [d] blinking at the bottom line
Output Pulse output
Power Failure Memory Monthly max. demand log, Demand log, Present demand

*Demand alarm
When the present demand or estimated demand exceeds the setting value, it notifies by the output
and the indication. You need to set “DEM” with unit for pulse output setting in order to output.

Please use this simple demand function as your standard.
It doesn’t support pulse input. It supports only CT input (power measurement).
The time used by this function is the time set up with Eco-POWER METER.
Therefore, it is different from the demand meter controlled by an electric power company.

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