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KM50-C
Smart Power Monitor
Power and current can be measured simultaneously. Measurement of generated power (regenerative power), leading reactive power, lagging reactive power, and consumed power. Low Cost Power Monitor.
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last update: October 1, 2015
Ratings
| Model | KM50-C | |
|---|---|---|
| Applicable circuit | Single-phase two-wire, single-phase three-wire, and three-phase three-wire power | |
| Rated power supply voltage | 100 to 240 VAC, 50/60 Hz
The power supply voltage and measurement voltage input are shared (terminals 6 and 7). |
|
| Allowable supply voltage range | 85% to 110% of rated power supply voltage | |
| Allowable frequency range | 45 to 65 Hz | |
| Power consumption | 7 VA max. | |
| Rated
input |
Rated input voltage | 100 to 240 VAC (single-phase, 2-wire): Line voltage
100/200 VAC (single-phase, 3-wire): Phase voltage/line voltage 100 to 240 VAC (3-phase, 3-wire): Line voltage |
| Rated input current | 5 A, 50 A, 100 A, 200 A, 400 A, or 600 A (primary current of Special CT) * | |
| Rated frequency | 50/60 Hz | |
| Rated input power | With 5-A CT: 2 kW
With 50-A CT: 20 kW With 100-A CT: 40 kW With 200-A CT: 80 kW With 400-A CT: 160 kW With 600-A CT: 240 kW |
|
| Allowable input voltage | 110% of rated input voltage (continuous) | |
| Allowable input current | 120% of rated input current (continuous) | |
| Rated input load | Voltage input: 0.5 VA max. (excluding power supply)
Current input: 0.5 VA max. (for each input) |
|
| Time | 2010 to 2099 (Adjusted for leap year.)
Accuracy: ±1.5 min/month (at 23 °C) |
|
| Time backup period | 3 days (without power supply, at 23 °C) | |
| Ambient operating temperature | -10 to +55 °C (with no condensation or icing) | |
| Storage temperature | -25 to +65 °C (with no condensation or icing) | |
| Ambient operating humidity | 25% to 85% | |
| Storage humidity | 25% to 85% | |
| Altitude | 2,000 m max. | |
| Installation environment | Overvoltage category and measurement category: 2, Pollution level: 2 | |
* A special output signal is output as the secondary current from the Special CT.
Performance
Smart Power Monitor
| 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 |
||
*1 The error of the Special CT is not included.
*2 There may be error in the alarm output OFF delay and ON delay due to the measurement sampling cycle.
*3 This is the error in the operating time of the alarm output (including the error in the alarm output ON/OFF delays and
output terminal switch operating time).
*2 There may be error in the alarm output OFF delay and ON delay due to the measurement sampling cycle.
*3 This is the error in the operating time of the alarm output (including the error in the alarm output ON/OFF delays and
output terminal switch operating time).
CTs
| Model | KM20-
CTF- 5A |
KM20-
CTF- 50A |
KM20-
CTF- 100A |
KM20-
CTF- 200A |
KM20-
CTF- 400A |
KM20-
CTF- 600A |
|---|---|---|---|---|---|---|
| Rated primary current | 5 A | 50 A | 100 A | 200 A | 400 A | 600 A |
| Secondary winding | 3,000 turns | 6,000 turns | 9,000 turns | |||
| Application frequency | 10 Hz to 5 kHz | |||||
| Insulation resistance | Between output terminal and external case: 50 MΩ min. (at 500 VDC) | |||||
| Dielectric strength | Between output terminal and external case: 2,000 VAC for 1 min | |||||
| Protective element | 7.5 V clamp element | |||||
| Allowable number of
connections/disconnections |
100 times | |||||
| Inner diameter | 7.9 dia. max. | 9.5 dia. max. | 14.5 dia. max. | 24.0 dia. max. | 35.5 dia. max. | |
| Operating temperature and
humidity range |
-20 to +60 °C 85% (with no condensation) | |||||
| Storage temperature and
humidity range |
-30 to +65 °C 85% (with no condensation) | |||||
* If you use a flat cable, select the cable based on the dimensions of the CT.
CT Cable
| Model | KM20-CTF-CB3 |
|---|---|
| Cable length | 3 m |
Note: Either use the CT Cable specified by OMRON or use 1.25-B3A crimp terminals and AWG22 wire from J.S.T. Mfg.
Co., Ltd.
Co., Ltd.
last update: October 1, 2015
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