UMT 1

Applicatons

The UMT 1 is a measuring transducer for true RMS values. The UMT 1 can measure an electrical three-phase system with current and voltage measuring inputs. The primary measured values are calculated and displayed on the two-line, 16 character LC Display, and also transmitted by either analog outputs (configurable as -20 to 20 mA, 0 to 20 mA, or 4 to 20 mA) or a communication interface to a higher level-control system.

The primary measured values of voltage and current are used to calculate the values for real, reactive, and apparent power, power factor (cosphi), kWh, and kvarh. The kWh and kVarh can also be transmitted by using an pulse output.

The list of measured values includes

• Measured
  • Voltage
    • Wye: V_L1N / V_L2N / V_L3N
    • Delta: V_L12 / V_L23 / V_L31
  • Frequency f_L123
  • Current I_L1 /I_L2 /I_L3
• Calculated
  • Average voltage V_ØL123 / V_min / V_max
  • Average current I_ØL123 / I_min / I_max
  • Real power P_Total/ P_L1 / P_L2 / P_L3
  • Reactive power Q_total
  • Apparent power S_total
  • Power factor cosf_L1
  • Active energy kWh_{positive/negative}
  • Reactive energy kvarh_{leading/lagging}

Description

There are different UMT 1 packages to choose from:

Package UMT 1/A3

• 3× true RMS voltage sensing
• 3× true RMS current sensing
• Class 0.5 accuracy
• 3 config. analog outputs (20 mA)
• 1 config. pulse output for kWh/kvarh
• Two-line LC display

Package UMT 1/A3SU

• 3× true RMS voltage sensing
• 3× true RMS current sensing
• Class 0.5 accuracy
• 3 config. analog outputs (20 mA)
• 1 config. pulse output for kWh/kvarh
• Two-line LC display
• RS-485/Modbus RTU

Package UMT 1/A6

• 3× true RMS voltage sensing
• 3× true RMS current sensing
• Class 0.5 accuracy
• 6 config. analog outputs (20 mA)
• 1 config. pulse output for kWh/kvarh
• Two-line LC display