| Model |
KM50-C |
Accuracy
*1 |
Voltage |
± 1.0% FS ± 1 digit (at ambient temperature of 23 °C, rated input, and rated
frequency).
However, the accuracy is ± 2.0% FS ± 1 digit for the Vtr line voltage for three-
phase, three-wire power and the Vrs line voltage for single-phase, three-wire
power under the same conditions. |
| Current |
± 1.0% FS ± 1 digit (at ambient temperature of 23 °C, rated input, and rated
frequency).
However, the accuracy is ± 2.0% FS ± 1 digit for the phase-S current for
three-phase, three-wire power and the phase-N current for single-phase,
three-wire power under the same conditions. |
Active power Reactive
power |
± 2.0% FS ± 1 digit (at ambient temperature of 23 °C, rated input, rated
frequency, and a power factor of 1)
Reactive power formula: Reactive power = v × i × sin θ
* "v" is the instantaneous voltage and "i" is the instantaneous current.
θ is the phase difference between the voltage and current. |
| Frequency |
± 0.3 Hz ± 1 digit (at ambient temperature of 23 °C, rated input, and rated
frequency) |
| Power factor |
±5.0% FS ±1 digit (at ambient temperature of 23 °C, rated input, rated frequency,
and Power factor = 0.5 to 1 to 0.5)
Power factor formula: Power factor = Active power/Apparent power
* Apparent power = √ (Active power)2 + (Reactive power)2 |
| Temperature |
± 5 °C two hours after the power is turned ON (after setting the offset to match
the ambient environment) |
| Low-cut current set value |
0.1% to 19.9% of rated current input (in 0.1% increments) |
| Sampling cycle |
100 ms for measurement voltage at 50 Hz and 83.3 ms for measurement
voltage at 60 Hz |
| Temperature influence *1 |
± 1.0% FS ± 1 digit (percentage of power within operating temperature range,
at ambient temperature of 23 °C, rated input, rated frequency, and power
factor of 1) |
| Frequency influence *1 |
±1.0% FS ±1 digit (percentage of power within rated frequency ±5 Hz, at ambient
temperature of 23 °C, rated input, and power factor of 1) |
| Influence of harmonics *1 |
± 0.5% FS ± 1 digit (at ambient temperature of 23 °C, error for superimposed
2nd, 3rd, 5th, 7th, 9th, 11th, and 13th harmonics for a content percentage of
30% for current and 5% for voltage of the basic wave) |
| Insulation resistance |
1) Between all power circuits and all of the RS-485 terminals, OUT1, OUT2,
event inputs, I/O commons, and transistor outputs: 20 MΩ max. (at 500 VDC)
2) Between all current and voltage inputs and all of the RS-485 terminals, OUT1,
OUT2, event inputs, I/O commons, and transistor outputs: 20 MΩ max. (at 500
VDC)
3) Between all current and voltage inputs and the front case: 20 MΩ max. (at
500 VDC)
4) Between all power circuits and the front case: 20 MΩ max. (at 500 VDC) |
| Dielectric strength |
1) Between all power circuits and all of the RS-485 terminals, OUT1, OUT2,
event inputs, I/O commons, and transistor outputs: 2,800 VAC for 1 min
2) Between all current and voltage inputs and all of the RS-485 terminals,
OUT1, OUT2, event inputs, I/O commons, and transistor outputs: 3,600 VAC for
1 min
3) Between all current and voltage inputs and the front case: 3,600 VAC for 1 min
4) Between all power circuits and the front case: 2,800 VAC for 1 min |
| Vibration resistance |
Single amplitude: 0.35 mm, Acceleration: 50 m/s2, Frequency: 10 to 15 Hz, 10
sweeps for 8 min each along three axes |
| Shock resistance |
150 m/s2, 3 times each in 6 directions (up/down, left/right, forward/backward) |
| Weight |
Approx. 150 g (Power Monitor only) |
| Degree of protection |
Front panel: IP66 (when mounted to a panel), Rear case: IP20, Terminal
section: IP00 |
| Memory backup |
EEPROM (non-volatile memory), No. of writes: 1,000,000 times |
| Compliant standards |
EN61010-1 (IEC61010-1), EN61326-1 (IEC61326-1), UL61010-1, CAN/CSA-
C22.2 No.61010-1 |
Event
inputs |
Number of inputs |
Two event inputs
The common terminal is shared with the OUT1 |
| Voltage input |
High level: 4.75 to 30 VDC
Low level: 0 to 2 VDC
Input impedance: Approx. 2 kΩ |
| No-voltage input |
ON resistance: 1 kΩ max.
OFF resistance: 100 kΩ min.
ON residual voltage: 8 V max.
ON current (at 0 Ω ): 10 mA max. |
| Minimum input time |
5 ms |
Transistor
outputs |
Number of outputs |
5 open-collector outputs (two total power consumption pulse output or alarm
output, and three, 3-state outputs)
The total power consumption pulse output and alarm output use the same
common terminal.
The three, 3-state outputs use the same common terminal. |
| Output capacity |
30 VDC, 30 mA max.
ON residual voltage: 12 V max.
OFF leakage current: 100 μ A max. |
| Alarm output delay *2 |
OFF delay: 0.0 to 99.9 s, ON delay: 0.0 to 99.9 s |
Characteristic
operating time *3 |
±200 ms |
Commu-
nications |
Communications
method |
RS-485 (2-wire half-duplex) |
| Sync method |
Start-stop |
| Unit number setting |
CompoWay/F: 0 to 99, Modbus: 1 to 99 |
| Baud rate |
1.2, 2.4, 4.8, 9.6, 19.2, 38.4 kbps |
| Transmission code |
CompoWay/F: ASCII, Modbus: Binary |
| Data length |
7, 8 bits |
| Stop bit length |
1, 2 bits |
| Vertical parity |
Even, odd, or none |
Maximum transmission
distance |
500 m |
Maximum number of
connected Power
Monitors |
CompoWay/F: 31, Modbus: 99 |
EMC
(Industrial electromagnetic
environment) |
EMI
EN61326-1 |
Radiated RF Electromagnetic Field: CISPR 11 class A
Conducted Emission: CISPR 11 class A |
EMS
EN61326-1 |
Electrostatic Discharge Immunity: EN61000-4-2
Electromagnetic Field Immunity: EN61000-4-3
Fast Transient/Burst Noise Immunity: EN61000-4-4
Surge Immunity: EN61000-4-5
Conducted Disturbance Immunity: EN61000-4-6
Power Frequency Magnetic Field Immunity: EN61000-4-8
Voltage Dip and Interruption Immunity: EN61000-4-11 |
Item list of KM50-C
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