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Techna-Tool Inc.
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Techna-Check - Model PWM3120T - Load Transducer for 3-phase AC Loads

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An ultra-fast measurement and ultra-precise transducer specifically developed for Machine Tool Monitoring applications. The PWM3120T is a unique design based on the fastest available 32-bit Microcontroller and 18-bit successive approximation AD Converters. A sampling rate of 150kHz ensures precise and correct measurement even when used with Frequency Inverters with 20kHz PWM base frequencies and higher.

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  • PWM3120T measures true motor power [kW].
  • TTBus Output
  • Proprietary RS485 type Sensor Bus
  • 8 Programmable Measurement Ranges
  • 1, 2.5, 5, 10, 15, 25, 50 or 100%
  • Shunt Sensors
  • 6 Amp. or 30 Amp. unit available as standard.
  • Custom ranges available upon request.

Mechanical

  • Housing: Polycarbonate.
  • Mounting: 35 mm DIN-rail.
  • Protection Class: IP40.
  • Temp. Range: -15 to + 50 C.
  • Weight: App. 200g.
  • Dimensions: 118 x 30 x 110 mm.

Electrical

  • Voltage Input: 3 x 0-500 VAC max.
  • Current Input: 3 x 6 Amp or 3 x 30 Amp
  • 0 Hz - 60kHz
  • Power Range: 0 - 4.780 kW AC (6A, 460 V)
  • 0 - 23.902 kW AC (30A, 460V)
  • Supply: 18-36 V DC max. 4.0 Watt.
  • TTbus output: RS485 - proprietary protocol.
  • The PWM3120T is designed primarily for measuring AC power consumed by motors driven by Variable Frequency Inverters. AC power is measured from the formula:
  • Where: T = period, V(t) = voltage and I(t) = current.        
  • The PWM3120T Power Transducer is specifically developed to function as a load transducer for the TECHNA- CHECK® Range of Machine Tool Monitors.
  • A Power Transducer for Tool-Monitoring must be fast and accurate. Sometime the measurement speed is as high as one half period, unlike commercial powermeters, which measure power averaged over several seconds.
  • Please note that most commercial Power Meters will not even be able to measure Power correctly after a Variable Frequency Inverter. The trans-ducer interfaces to Tool Monitor Applications via the proprietary TTBus interface.
  • The shunts (resistors actually) used by this de-vice represents the most accurate, linear and insensitive to external electromagnetic fields sensor available (unlike Hall Sensors and Current Transformers).