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KW9M Eco-POWER METER

Rating/ Performance

OVERVIEW OF FUNCTIONS

Type Standard Advanced
Measurement
items
Active power Each phase and Total (Import, Export)
Reactive power Each phase and Total (Import, Export)
Apparent power Each phase and Total
Power demand IEC61557-12 demand IEC61557-12 demand
30-min demand
Peak demand
Active electric energy Each phase and Total (Import, Export)
Reactive electric energy Each phase and Total (Import, Export)
Apparent electric energy Each phase and Total
Current Each phase and Average current Each phase, N-phase (when 3P4W) and Average current
Unbalanced current - Total (except N-phase)
Current THD Each phase
Current harmonics - Each phase (2nd to 31st harmonics)
Current demand Each phase current demand
Voltage Line voltage (Each line and average), Phase voltage (Each phase and average)
Unbalanced voltage - Total
Voltage THD Line and Phase voltage
Voltage harmonics - Line and Phase voltage (2nd to 31st harmonics)
Power factor Each phase and Average
Frequency Each phase and Average
Pulse count (Integral pulse) - 2 points
Temperature Ambient temperature
Calendar - Internal clock
Input - 2 points
Output - 2 points

* IEC 61557-12 is an international standard on performance measuring and monitoring devices (PMD).

Measurement items

Type Standard Advanced
Item Unit Display data
range*1
Present value
(Instantaneous
value)*2
Present value
(Instantaneous
value)*2
Maximum Minimum
Instantaneous
power
Active kW -99999 to 0.000 to 99999
Reactive kvar
Apparent kVA
Integral
power
(import)
Active kWh 0.00 to 9999999.9Wh*3
0.000 to 29999999
- -
Reactive kvarh
Apparent kVAh
Integral power
for each time
zone (4-zone)
(import)
Active kWh 0.00 to 9999999.9 - - -
Reactive kvarh
Apparent kVAh
Integral power
(export)
Active kWh 0.000 to 9999999.9
* Total integral power (export)
0.000 to 29999999
- -
Reactive kvarh
Integral power
for each time
zone (4-zone)
(export)
Active kWh 0.000 to 9999999.9 - - -
Reactive kvarh
Current A 0.000 to 99999
  N-phase when 3P4W A -
Voltage (Phase and Line voltage) V 0.00 to 99999
Power factor -1.000 to 0.000 to 1.000
Frequency Hz 0.00 to 99.99
Pulse count value 0.000 to 99999999 - - -
Power
conversion
value
Total 0.000 to 9999999.9 - -
For
each time zone
- - -
Temperature degree C -100.0 to 100.0 - -
Calendar January 1, 2000 00:00:00
to
Dec. 31, 2099 23:59:59
- - -

*1 The data display range is the numerical value range which can be displayed by the main unit display section and not the allowable measurement range. *1 Instantaneous value
*2 Instantaneous value
*3 The value measured in 0.01Wh corresponds to reading via RS-485 communication only.

Power quality

Item Unit Display data range Present value
(Instantaneous
value)
Maximum Minimum
Unbalanced current*1 Each phase % 0.000 to 999.99
Unbalanced voltage*1 Each phase % 0.000 to 999.99
Current THD*2*4 Each phase % 0.000 to 400.00 - -
Voltage THD*2*4 Each phase % 0.000 to 400.00 - -
Current harmonics*1*3 Each phase % 0.000 to 400.00 - -
Voltage harmonics*1*3 Phase % 0.000 to 400.00 - -
Line % 0.000 to 400.00 - -

*1 Only advanced type
*2 Total harmonic distortion
*3 2nd to 31st
*4 If the voltage to be measured is not the rated (commercial) frequency, it may take time for THD (total harmonic distortion) to stabilize.

Demand measurement

Item Unit Display data range Present value
(Instantaneous value)
Maximum Minimum
Present
demand
Active kW 0.000 to 99999 -
Reactive kvar
Apparent kVA
Active (export) kW
Reactive (export) kvar
Current A
Estimated demand*1, 2 kW 0.000 to 99999 - -
Ratio of estimated demand*1, 2 % 0.000 to 99999 - -
Integral power converted by pulse*1, 2 kWh 0.000 to 999999.99 - -

* Please use this demand function as your standard.
The demand value calculated with this function is not guaranteed.
*1 Only advanced type
*2 Only when 30-min demand is set.

Accuracy

Item Standard Advanced
Accuracy
[Without error of
CT / VT]
Electrical
power
0.5%
Active electric power Class 0.5S (IEC 62053-22)*1
Reactive electric power Class 2(IEC 62053-23)*1
Current 0.2%*2 (Single-phase three-wire system 2 (N) phase current, three-phase three-wire system 2 (S) phase current, 0.5%)
Voltage 0.2% (Single-phase three-wire system 2 (N) phase voltage, three-phase three-wire system between 3-1 voltage, three-phase four-wire system line voltage is 0.5%)
Temperature ±5.0℃( after cycle temperature correction(selectable in setting mode)) two hours after communication

*1 IEC62053 is the international standard for electrical power measuring devices.
*2 Current less than 5% of rated value may be outside of accuracy assurance range according to CT setting (maximum tolerance: 0.5%).

General specifications

Type Standard Advanced
Supply voltage
range
100-240V AC
100-300V DC
Rated frequency 50/60 Hz
Nominal power
consumption
5 VA approx. (240 V AC at +25 ℃ +77 ℉) 6 VA approx. (240 V AC at +25 ℃ +77 ℉)
3 W approx. (240 V DC at +25 ℃ +77 ℉) 3 W approx. (240 V DC at +25 ℃ +77 ℉)
Inrush current 30 A or less (240 V AC/DC at +25 ℃ +77 ℉)
Allowable momentary
power-off time
10 ms
Ambient
temperature
Accuracy guarantee: −10 to +55 ℃ +14 to +131 ℉
Operation: −25 to +55 ℃ −13 to +131 ℉
Storage: −25 to +70 ℃ −13 to +158 ℉
Ambient humidity 30 to 85 % RH (at +20 ℃ +68 ℉) non-condensing
Breakdown voltage
(initial)
Between the isolated circuits: 2,000 V/1 min Between the isolated circuits: 1,500 V/1 min
a) enclosure - all terminals
b) between insulated circuits
・power supply terminals – other terminals
・RS-485 terminals – other terminals
・measured current input terminals – other terminals
a) enclosure - all terminals
b) between insulated circuits
・power supply terminals - other terminals
・RS-485 terminals - other terminals
・measured current input terminals - other terminals
・pulse input terminals - other terminals
・pulse output terminals - other terminals
Insulation resistance (initial) Between the isolated circuits: 100 MΩ or more
Vibration resistance 10 to 150 Hz (7.5 minutes/cycle)
single amplitude: 0.075 mm 0.0030 in (1 h on 3 axes)
10 to 55 Hz (1 minute/cycle)
single amplitude: 0.375 mm 0.015 in (1 h on 3 axes)
Shock resistance Min. 294 m/s2 (5 times on 3 axes)
Display method LCD with backlight
Display updating time 100 to 1000 ms (set with setting mode)
Power failure memory
method (when power OFF)
Internal memory (overwrite 1010 or more)
Calendar Range - From January 1, 2000 00:00:00
to December 31, 2099 23:59:59
Accuracy ±15 seconds/month (at +25 ℃ +77 ℉)
Backup About 1-month (backup with secondary battery)
(after passing 48-hour, at +23 ℃ +73.4 ℉)
Degree of protection Front: IP51, Back: IP20
Sea level altitude Under 2,000 m 6,562 ft
Overvoltage category 2
Pollution degree II
Dimensions W/H/D 96 × 96 × 56 mm 3.78 × 3.78 × 2.20 in (without terminal block)
96 × 96 × 68 mm 3.78 × 3.78 × 2.68 in (with terminal block)
Weight 450 g approx. 480 g approx. (with secondary battery)

MEASUREMENT SPECIFICATIONS

Type Standard Advanced
Measured data AC sine
Phase/Wire system Single-phase two-wire (1P2W) (max. 3-circuit), Single-phase three-wire (1P3W),
Three-phase three-wire (3P3W) and Three-phase four-wire (3P4W) (Common)
Applicable power system 100 V system, 200 V system and 400 V system
Measured frequency 50/60 Hz
Sampling
rate
Sampling 1.024 MHz (1.0 μs approx.) 1.024 MHz (1.0 μs approx.)
Date
update
Instantaneous
value
100 ms 100 ms
Harmonics 2.25s 22.5s (2nd to 31st)
Voltage Input
voltage
1P2W L-L 0 to 500 V AC
1P3W L-L 0 to 500 V AC
L-N 0 to 250 V AC
3P3W L-L 0 to 500 V AC
3P4W L-L 0 to 500 V AC
L-N 0 to 289 V AC
Impedance 2 MΩ or more (L-N: V1/V2/V3-Vn)
Resolution 0.01 V
Power consumption 0.2 VA approx. (L-N: V1/V2/V3-Vn)
Accuracy
(Note 1)
0.2 %
*0.5 % for 2-phase voltage of 1P3W, 3-1 voltage of 3P3W and line voltage of 3P4W.
VT ratio 1.00 to 600.00 (set with setting mode)
*Voltage transformer (VT) is required when you measure a load with voltage over rated voltage. (Rated secondary voltage of VT is 110 V.)
*When it input direct, VT ratio is set to 1.00.
Current Input
current
(with CT)
Primary
current
65,535 A or less
Secondary
current
1 A or 5 A (set with setting mode)
Max. current 10 A (200 % of the rating)
Overload capacity 1,000 % of the rating for 3s
Resolution 0.001 A
Power consumption 0.2 VA approx.
Accuracy
(Note 1)
0.2 % (Note 2)
*0.5 % for 2 (N) - phase current of 1P3W and 2 (S) - phase current of 3P3W.
Power Accuracy
(Note 1)
0.5 %
Active power Class 0.5S (IEC 62053-22)
Reactive power Class 2 (IEC 62053-23)
Temperature Accuracy ±5.0 ℃ ±41 ℉ (after ambient temperature correction with setting mode)
Passing 2 hours or more after energized

Notes:

1) Without error of current transformers (CT) and voltage transformers (VT)
2) As to the current under 5 % of rating, it may not satisfy the accuracy according to CT setting (max. error; 0.5 %).
* It measures from 0.1 % of CT secondary current.
* IEC62053 is the international standard for Electricity metering equipment.

Output specifications (for AKW92112)

Number of output point 2 points *Insulate between output terminals
Insulation method PhotoMOS relay
Output type 1a
Output capacity 100 mA, 30 V AC/DC
Output mode (OUT1/OUT2) ・Pulse by integral power
・Output by alarm or events (set with setting mode)
Pulse output
by integral
power
Pulse width 100 ms approx.
Pulse
output unit
0.0001 kWh / 0.001 kWh / 0.01 kWh / 0.1 kWh /1 kWh / 10 kWh / 100 kWh
Alarm
output
Event
output
Type Stand-by power alarm / Under voltage alarm / Over voltage alarm /
Power interruption alarm / Under current alarm / Over current alarm /
Active power alarm / Reactive power alarm / Apparent power alarm /
Power factor alarm / Over frequency alarm / Under frequency alarm /
Voltage harmonics alarm / Current harmonics alarm / Voltage THD alarm /
Current THD alarm / Unbalanced voltage alarm / Unbalanced current alarm /
Power demand alarm / Current demand alarm / Counter output /
Level output (external control)
Alarm reset Self-reset (according to the setting) / Manual-reset
Protection element Varistor (Note)

Note: Varistor is mounted internal as a protection element.
Install a protective device in case of using at the place where it effects by surge.

<How to calculate>

(1) Calculate the appropriate power to be measured from the unit of the integral power pulse output.
Unit for pulse output > (Max. measurement power [kW]) / (3,600 sec × 1 pulse/sec)
When the pulse output unit is 0.001, the maximum power that can be properly measured by pulse output is 3.6 kW (3,600 sec × 1 pulse/sec × 0.001).
If the load is higher than this value, the output pulses cannot keep up with it, and the number of pulses becomes small.
In such cases, set the pulse output unit to the value immediately above.
(2) Calculate the appropriate pulse output unit from the instantaneous power to be measured.
(Max. measurement power [kW]/3,600 sec × 1 pulse/sec) < Unit for pulse output
When the maximum power to be measured is 10 kW, the pulse output unit required for the correct pulse output is 0.01 kWh/pulse, which is the value immediately above this one:
10 W/3,600 sec × 1 pulse/sec = 0.0027

Notes:

(1) If the pulse output unit is set to output one pulse or more per second, the Eco- POWER METER® cannot correctly output pulses.
(2) If the pulse output OFF time is set too short, count errors by connected counters, PLCs (Programmable Logic Controllers) may occur.

Input specifications (for AKW92112)

Number of input point 2 points *Not insulate between input terminals (COM is common.)
Insulation method Designated insulation for input (insulate to the other functions)
Input method Contact/ non-voltage a contact or open-collector
(Powered by an internal power supply)
Input signal Nonvoltage
input
・Impedance; Max. 1 kΩ
(when short-circuit current: Max. 10 mA)
・Residual voltage when shorted: Max. 3 V
・Impedance when open: Min. 100 kΩ
Input mode IN1 Pulse input or synchronized with output from outer device
IN2 Pulse input
Max. counting
speed
IN1 30 Hz (when pulse input)
IN2 2000 Hz / 30 Hz
Min. input
signal width
IN1 16.7 ms ON:OFF ratio = 1:1
IN2 0.25 ms (when 2000 Hz is set) / 16.7 ms (when 30 Hz is set)
ON:OFF ratio = 1:1
Pre-scale Decimal point Under 3-digit
Range 0.001 to 100.000 (set with setting mode)
Output mode
(when pulse
output is selected)
HOLD
Protective elements Zener diode

DEMAND MONITOR AND CONTROL SPECIFICATIONS

Standard type supports only marked items(●).

Demand type ・Peak demand
・IEC61557-12 demand●
1. Sliding block interval demand
2. Fixed block interval demand
3. Current demand
・30-min demand
(set with setting mode)
Demand monitor input type Current transformer (CT) input (IEC demand /30-min demand)●
Integral pulse input (only 30-min demand) (set with setting mode)
Demand
time span
(Note 1)
IEC61557-12 demand● 1 to 60 min. (set with setting mode)
30-min demand 30 min. (fixed)
Demand measurement item Present demand, Estimated demand (only 30-min demand)
Demand calculate method
(Note 2)
Additional method / Average method
(set with setting mode)
Demand data update cycle● 1 min.
Demand stand-by time
(mask time) (Note 2)
1 to 30 min. (set with setting mode)
Display IEC61557-12 demand● Present demand [active/ reactive/ apparent/active(export)/ reactive(export)/ current]
30-min demand Power demand (active power), Estimated demand,
Demand target value, Ratio of estimated demand,
Current present demand, Monthly max. demand, Max. demand
Saved data Monthly max. demand 12 records (12-month), Max.demand●
Time span synchronized method Clock synchronized (Pulse input to IN1) (set with setting mode)
Synchronized
signal
input
<IN1>
Input terminal IN1
Input method Non-voltage a contact or open-collector
(Powered by an internal power supply)
Pulse input condition Pulse width 50 ms or more
Operatingvoltage/
current
5 V DC 10 mA
Signal common Common (IN2; common to pulse input)
Pulse
input
<IN2>
Input terminal IN2
Input method Non-voltage a contact or open-collector
(Powered by an internal power supply)
Pulse input
signal
50,000 pulse/kWh <An external pulse detector required>
2,000 pulse/kWh <An external pulse convertor required>
  Pulse rate 0.001 to 100.000 kWh/pulse
Pulse
input
condition
2000 Hz Pulse width
Pulse interval
0.25 ms or more
0.5 ms or more (OFF: 0.25 ms or more)
30 Hz Pulse width
Pulse interval
16.7 ms or more
33.4 ms or more (OFF: 16.7 ms or more)
Operating voltage/
current
5 V DC 10 mA
Signal common Common (IN1; common to clock synchronized input)

Notes:

1) Available when sliding block interval demand or fixed block interval demand is selected.
2) The time span can be arbitrarily set only for sliding block interval demand and fixed block interval demand.

COMMUNICATION SPECIFICATIONS

<RS-485>

Interface Conforming to RS-485
Communication method Half-duplex
Synchronous system Synchronous communication method
Isolation status Isolated with the internal circuits
Protocol MEWTOCOL, Modbus RTU, DL/T645-2007 (Note 1)
(select with setting mode)
Number of connected unit 99 (max.) (Note 2)
Transmission distance 1,200 m 3,937 ft (Note 3)
Transmission speed 1,200 / 2,400 / 4,800 / 9,600 / 19,200 / 38,400 / 57,600 / 115,200 bps
(select with setting mode)
Transmission
format
Data length 8bit (fixed)
Parity Not available / odd number / even number (select with setting mode)
Stop bit 1bit, 2bit (select with setting mode)

Notes:

1) MEWTOCOL is the protocol for PLC from Panasonic. DL/T645 is the China powermeter standard. Only DL/T645-2007 is supported.
2) For RS-485 converter on the computer side, we recommend SI-35 and SI-35USB (from LINE EYE Co., Ltd.). When using SI-35, SI-35USB or PLC from our company (which can be connected up to 99 units), up to 99 can be connected.
In case using this system with the other devices, up to 31 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.

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