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KW7M Eco-POWER METER (Discontinued Products)

Rating/ Performance

Measurement items

Item
Unit
Data range
Instantaneous electrical power
kW
0.00 to 999999.99
Integrated electrical power
kWh
0.00 to 9999999.9
Current
L1 (CT1) phase current
A
0.0 to 6000
L2 (CT2) phase current
A
0.0 to 6000
Voltage
Voltage between 1-2
V
0.0 to 9999
Voltage between 2-3
V
0.0 to 9999
Electricity charge (Note)
0.00 to 99999999

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

Main unit

Item Specifications
Rated operating voltage
100 to 120/200 to 240V AC
Rated frequency
50/60 Hz common
Rated power consumption
6 VA (240 V AC at +25 ℃ +77 )
Allowable operating voltage range
85 to 132/170 to 264V 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)
Breakdown voltage (initial)
Between the isolated circuits: 2000 V for 1min ・ Insulated circuit [between (1) and (2), (2) and (3), (1) and (3)]
(1) Power terminal [1 (R), 2 (N and S) and 3 (T)]
CT input terminal [CT1 (+, -), CT2 (+, -)] - all terminals
(2) RS485 terminal (+, -, E) - all terminals
(3) Pulse output terminal (+, -) - all terminals
・ Outer edge (case) - all terminals
Insulation resistance (initial)
Between the isolated circuits: 100 MΩ or more
(measured with 500 V DC)
Vibration resistance
10 to 55 Hz (1cycle / min), single amplitude: 0.375 mm 0.01 in (1 hour on 3 axes)
Shock resistance
Min. 294 m/s2 (5 times on 3 axes)
Display method
8-digit, 7-segment LED
Power failure memory method
EEP-ROM (Over 100,000 overwrites)
Weight
100 g approx.

Input specifications

Item Specifications
Input voltage Rating Single-phase two-wire system: 100 to 120/200 to 240 V AC (common use)
Single-phase three-wire system: 100 to 120 V AC
Three-phase three-wire system: 100 to 240 V AC
Allowable measuring voltage 85% to 110% of rated operating voltage
VT ratio 1.00 to 99.99 [External voltage transformer (VT) is required.]
Input current Rating of primary side 5 A/50 A/100 A/250 A/400 A (when using dedicated CT)
1 to 4000 A (when using secondary 5A CT)
Cut-off current 1.0 to 50.0%F.S
Accuracy
(without error in CT and VT)
Basic accuracy Instantaneous electric power / Integrated electric power / Electricity charge
Within ± (2.0 % F.S. + 1 digit)
(at +20 ℃ +68 , rated input, rated frequency, power factor 1)
In case of 5 A CT mode, within ± (2.5 % F.S. + 1 digit)
*Accuracy coverage: 5 to 100 % of rated current
Current
Within ± (1.0 % 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
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)
In case of 5 A CT mode, within ± (1.5 % F.S. + 1 digit)
(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)
(Frequency change ± 5 % based on rated frequency, rated input, power factor 1)

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/
Power alarm(AL-P)/Current alarm(AL-C) /Stand-by alarm (AL-S)
(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])

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

Communication Specifications

Item Specifications
Interface Conforming to RS-485
Protocol MEWTOCOL/MODBUS(RTU) (selectable with setting mode)
Isolation status Isolated with the internal circuit
Number of connected units 99 (max.) (Note2)(Note3)
Transmission distance 1200m (max.) (Note1)
Transmission speed 38400/19200/9600/4800/2400bps (selectable with setting mode)
Transmission Format Data length 8bit/7bit (selectable with setting mode) (Note4)
Parity Not available / Odd number / Even number (selectable with setting mode)
Stop bit 1bit(fixed)
Communication method Half-duplex
Synchronous system Synchronous communication method
Transmission line Twisted-pair cable with shield or VCTF
Communication mode 1 : N communication
Ending resistance approx. 120Ω(built-in) (Terminal (E) and terminal (-) is shorted when ending.)

Notes:
1) Please check with the actual devices when some commercial devices with RS485 interface are connected. The number of connected devices, transmission distance, and 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 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.
4) With MODBUS (RTU) protocol, it works only with 8bit.

DEDICATED CURRENT TRANSFORMER (CT)

Specifications

Item Clamp-on typ
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
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.

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