KW Power Meters Specifications
Specifications for this product appear below.
Measurement items
| Item | KW4M | KW7M | KW8M | |
|---|---|---|---|---|
| Instantaneous electrical power | 0.00 to 9999.99KW | Active power: 0.00 to 9999999.9KWh Reactive Power: 0.00 to 9999999.9Kvarh Apparent Power: 0.00 to 9999999.9KVAh |
||
| Integrated electrical power | 0.00 to 9999.99kWh to 10.00MWh to 9999.99MWh 9-digit display: 0.00 to 9999999.99kWh |
0.00 to 999999.99 to 1000000.0 to 9999999.9KWh | Active power: 0.00 to 999999.99KWh Reactive Power: –99999.99 to 0.00 to 999999.99Kvarh Apparent Power: 0.00 to 999999.99KVAh |
|
| Current | MEWTOCOL type: L1(CT1),L2(CT2)phase current: 0.0 to 999.9A Modbus type : L1(CT1),L2(CT2)phase current: 0.0 to 6000.0A |
L1(CT1)phase current: 0.0 to 999.9 to 1000 to 6000A L2(CT2)phase current: 0.0 to 999.9 to 1000 to 6000A |
CT1:0.0 to 6000A CT2:0.0 to 6000A CT3:0.0 to 6000A |
|
| Voltage | Voltage between 1-2: 0.0 to 9999.9V Voltage between 2-3: 0.0 to 9999.9V |
Voltage between 1-2: 0.0 to 999.9 to 1000 to 9999A Voltage between 2-3: 0.0 to 999.9 to 1000 to 9999A |
Voltage between P1 and P0: 0.0 to 9999V Voltage between P2 and P0: 0.0 to 9999V Voltage between P3 and P0: 0.0 to 9999V |
|
| Electricity charge *1 | Yen | 0 to 999999JPY | 0.00 to 99999999 | |
| Dollars | 0 to 9999.99$ | |||
| Euros | 0 to 9999.99EUR | |||
| Yuan | 0 to 9999.99CNY | |||
| Power Factor | Display | - | - | 0.00 to 1.00 (Distiguishes if ahead (LEAD) or behind (LAG).) |
| Communication | - | - | –1.00 to 0.00 to 1.00 (Within range of phase angle θ = –90 to 0 to +90°) | |
| Frequency | 47.5 to 63.0 | |||
| Hour meter | ON time | 0.0 to 99999.9 h(Hour) | 0.0 to 99999.9 h(Hour) | |
| OFF time | 0.0 to 99999.9 h(Hour) | 0.0 to 99999.9 h(Hour) | ||
| Pulse input | 0 to 999999 Counts | - | 0 to 99999999 Counts | |
Main unit
| Item | KW4M | KW7M | KW8M |
|---|---|---|---|
| Rated operating voltage | 100-120/200-240V AC | 100 to 240V AC | |
| Rated frequency | 50/60 Hz common | 50/60Hz | |
| Rated power consumption | 8VA | 6 VA | 8VA |
| Allowable operating voltage range | 85 to 132/170 to 264V AC (85% to 110% of rated operating voltage) | 85 to 264V AC (85% to 110% of rated operating voltage) | |
| Allowable power off time | 10ms | ||
| Ambient temperature | -10°C to +50°C/+14°F to +122°F (Storage temperature: -25°C to +70°C/ - 13°F to 158°F) | ||
| Ambient humidity | 30 to 85%RH (at 20°C non-condensing) | ||
| Display method | With Backlight 6-digit, 7-segment LCD for settings and 4-digit, 16-segment LCD for modes. Upper display: green, Lower display: amber | 7-segment LED | 8-digit, 7-segment LED |
| Power failure memory method | EEP-ROM (Over 100,000 overwrites) | ||
| Protective construction | IP66 (front panel with rubber gasket) Note: Waterproofing (IP66)will be lost in continuous (permanently attached)installations. |
- | - |
| Weight | For 11-pin type: approx. 130 g, For Screw terminal type: approx. 140 g |
approx. 100 g | AKW8111: approx.235g AKW8111H: approx.250g |
Input specs
| Item | KW4M | KW7M | KW8M | |
|---|---|---|---|---|
| Input voltage | Rating | Single-phase two-wire : 100-120/200-240V AC（common） Single-phase three-wire : 100-120V AC Three-phase three-wire : 200-240V AC |
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) |
|
| Allowable measuring voltage | 85% to 110% of rated operating voltage Single-phase two-wire : 85-132/170-264V AC（common） Single-phase three-wire : 85-132V AC Three-phase three-wire : 170-264V AC |
|||
| VT ratio | 1.00 to 99.99 [External voltage transformer (VT) is required.] ※Voltage transformer (VT) is required when you measure a load with voltage over 200V system. ※Secondary current rating of commercial VT is 110V. |
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) |
||
| Max. displayed voltage | 9999.9 V | 9999 V | ||
| Input current | Primary side rating | <In case using dedicated CT> ・5A/50A/100A/250A/400A (Select with setting mode) <In case using 5A CT with secondary rating 5A> ・1～999.9A (Set with setting mode) (MEWTOCOL type) ・1～4000A (Set with setting mode) (MODBUS type) ※Use a commercial CT with secondary side current of 5A when measuring 400A or more. ※Accuracy coverage：10～100% of rated current of CT |
• 5A/50A/100A/250A/400A (In case using dedicated CT.) (Select with setting mode) • 1 to 4000A (Set with setting mode) *Use a commercial CT with secondary side current of 5A when measure 400A or more. *Accuracy coverage: 10 to 100% of rated current of CT |
|
| CT ratio | ・1～999 (Set with setting mode) (MEWTOCOL type) ・1～4000 (Set with setting mode) (MODBUS type) ※In case measuring CT of secondary rated current 5A. |
1 to 4000/5 A (Can be set in setting mode.) (Supported when dedicated CT used in 2-step configuration.) | ||
| Max. displayed current | ・ 999.9A (MEWTOCOL type) ・6000.0A (MODBUS type) |
6000 A (When 400 A or higher, use commercial CT with 5 A rated secondary current.) | ||
| Accuracy | Basic accuracy | Instantaneous electric power, Integrated electrical energy Voltage, Current, Electricity charge |
Instantaneous electrical power, Integrated electrical energy, Voltage, Current and Electricity charge | |
| ±2.5% F.S. ±1digit (at 20℃, rated input, rated frequency, power-factor 1) ※Accuracy coverage：10～100% of rated current of CT |
[±2.5% F.S. ±1 digit (at 20°C rated input, rated frequency, power factor: 1), Guarantee accuracy range: 10 to 100% of a rated current of each CT] |
|||
| Hour Meter | - | |||
| ±0.01％±1digit (at 20℃) (In case power on start or current energizing,±0.01％+1s±1 digit) |
- | |||
| Temperature characteristics | ±1.5% F.S. /10℃ ±1digit (Range of –10 to 50℃ based on 20℃ for rated input power-factor 1) |
±1.5% F.S./10°C ±1 digit (for -10 to 50°C range, rated input and power factor: 1) | ||
| Frequency characteristics | ±1.5% F.S.±1 digit (Frequency change±5% based on rated frequency, for rated input power-factor 1) |
±1.5% F.S. ±1 digit (for ±5% frequency change, rated input and power factor: 1) | ||
Communications
| Item | KW4M | KW7M |
|---|---|---|
| Interface | Conforming to RS485 | |
| Protocol | MEWTOCOL/Modbus(RTU)(Depending on part number.) | |
| Number of connected units | Max. 99 units | |
| Transmission distance | Max. 1,200m | |
Pulse input
| Item | KW4M | KW7M |
|---|---|---|
| Input mode | Addition (fixed) | - |
| Max. counting speed | 2 kHz/30 Hz (selectable by mode) | - |
| Pulse input | Min. input signal width: 0.25 ms (when 2 kHz selected)/16.7 ms (when 30 Hz selected) ON : OFF ratio = 1 : 1 | - |
| Input signal | Contact/No contact (open collector) | - |
| · Impedance when shorted: 1kohm | - | |
| · Residual voltage when shorted: Max. 2 V | - | |
| · Impedance when open: 100kohm | - | |
| Output mode | HOLD (over count) | - |
| Number of digits | 6 digits display (0 to 999999)(selectable by mode) | - |
Pulse output (transistor output)
| Item | KW4M | KW7M | |
|---|---|---|---|
| Number of output points | 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 | 100 µA or less | - | |
| Pulse output unit *2 | When measuring power | 0.001/0.01/0.1/1/10/100 kWh/Alarm (selectable by mode) | - |
| When measuring pulse input | HOLD (over count) | - | |
Notes
* Power and pulse output are not possible at the same time
