The UPM100 is a compact power monitor that can be attached in industrial machinery etc. and measure instantaneous apparent power, instantaneous active power, instantaneous reactive power, instantaneous rms voltage and rms current of each phase, active energy, reactive energy, regenerative energy, apparent energy and instantaneous power factor.
The UPM100 can measure one of the single-phase 2-wire, single-phase 3-wire, three-phase 3-wire or three-phase 4-wire.
The UPM 101 measures the secondary side line of the existing CT by using a dedicated CT.



  • Various electric power and energy can be monitored by using a wide array of measuring functions.

  • Communication via RS-485 communication is possible.

  • The UPM100 and UPM101 is compact and can be mounted on DIN rail or a wall.

  • Good readability is realized by using a large LED display. In addition, since the 6-digit value with the decimal point which can move by key operation on a front panel is displayed, detailed electric power and energy can be checked.


  • Instantaneous active power, active energy and optional electric energy
  • Instantaneous reactive power*1 and reactive energy *1*2
  • Instantaneous apparent power, apparent energy and regenerative energy
  • Instantaneous rms voltage of each phase and maximum/minimum rms voltages of each phase
  • Instantaneous rms current of each phase and maximum rms current of each phase
  • Instantaneous power factor *1
  • Frequency
Phase and Wire Type Single-phase 2-wire, singlephase 3-wire, three-phase 3-wire, three-phase 4-wire
Rated Input Voltage 220V AC*1, 440V AC Either 127V AC or 277V AC for three-phase 4-wire
Allowable Input Voltage 1.2 times of rated voltage (continuous)
1.5 times of rated voltage (for 10 seconds)
Rated Input Current UPM100:1A AC, 5A AC
UPM101:5A AC (primary-side current of the dedicated CT)
Allowable Input Current 1.2 times of rated current (continuous)
Twice of rated current (for 10 seconds),10 times of rated current (for 3 seconds)
Active power/
Regenerative power
UPM100:±1.0% FS
UPM101:±2.0% FS
rms voltage and current for each phase UPM100:±1.0% FS
UPM101:±2.0% FS
Frequency ±1 Hz
Option output Pulse Output of Electric Energy : 2 points
Communication Protocols PC-link (with or without checksum), MODBUS (ASCII, RTU)
Transmission Distance Approx. 1.2 km max. (Using twisted-pair cable with 24AWG shield)
Baud Rate 19200, 9600 or 2400 bps
Maximum Number of Connected Units 31 (units that can be connected to PC or other device in multi-drop connection)
Power Monitoring Package SMARTDAC+GM(Power monitoring package), PR970
Power Supply 85~264V AC 45~65Hz
Consumed Power Maximum 7VA (with display function)
Outline / Wight 106 x 100 x 60mm / Approx. 400 g

*1: When "optional measuring function" is specified.
*2 Reactive energy LEAD and LAG are integrated. When "with pulse output" is specified, active energy pulse and reactive energy pulse are outputted. However, either LEAD or LAG is output for reactive energy pulse.


Application Note

Improving manufacturing efficiency demands constant action - from uncovering operational waste to identifying areas for continuous improvement. Namely, we must always pursue a cycle of visualizing, analyzing, and solving energy saving challenges.


Power monitoring package SMARTDAC+ GM and UPM100 system measures and quantifies the electrical energy consumption for each assembly line.

No. You'll need to use a type of product matching the phase and wire type.
Yes. Select one with a secondary current rating of 1 A or 5 A. The consumption VA of the UPM100 itself is 0.2 VA, so check the rated load of the CT including the wiring.
If the integral power value is exceeded, it automatically becomes 0 Wh and the integral is recalculated.
The UPM100 is a compact power monitor that measures the following in industrial devices and other factory instruments: apparent, active, reactive, integral active, integral reactive, integral regenerated, and integral apparent power, instantaneous va...
Check the active power. If the active power turns negative or extremely small, check the items below. The active power is negative when the power is regenerating. Items to check Is the CT attachment orientation correct? Is a CT connected to th...
For power monitors, you need to set up CT and VT ratios. (In the case of the PR300 power monitor, phase, wiring method, voltage range, and other settings are required in advance.) However, even when you enter these settings, there are times when the ...
For each power monitor, normally you use 1 to 3 CTs. Single phase 2-wire = 1 CT; single-phase three-wire = 2 CTs; three-phase three-wire = 2 CTs, and three-phase four-wire = 3 CTs.
What are VT and CT ratios?
Generally, when measuring high voltage and high current transformer signals, you use a VT (voltage transformer) and CT (current transformer). The ratios between the primary and secondary rated voltages and rated currents are the VT and CT ratios. For...
For low and high voltage measurement it is a D type ground, and for especially high voltage measurement it's an A type ground. (Use in combination with a Yokogawa power monitor. Note that the CTW series current converters are for low voltages.) ...


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