VCM-EN in Non Explosion-Proof Enclosure


MPS’ most popular model.  Applicable to Utility, Industrial, Hydro and all Rotating Machinery where monitoring of shaft current and shaft voltage on one unit is required.

For the most complete protection on large, or critical machines, the VCM-E is the perfect choice. With higher shaft current measurement capacity, uninterrupted grounding, continuous monitoring via 4-20mA signals and alarms,  operators are alerted to conditions such as grounding device failure or high voltage/current.  VCM-E’s continuously monitor shaft voltage and/or grounding/earthing current providing three 4‑20 mA output signals (per VCM-E) for remote monitoring and trending.


Key Benefits

  • Continuous Train Performance Sensing and Tracking
  • Continuous Train Trending Aiding in Maintenance Scheduling
  • Alarms when shaft grounding devices have lost contact with the shaft.
  • Alarms on high and low grounding current and/or high shaft voltage.

Early Warning of:

  • Loss of Shaft Grounding
  • High Residual Magnetism
  • High Static Electricity
  • Shaft or Rotor Rubs
  • Electrical Machinery Defects



  Operating Range:
-10°C to 50°C (14°F to 122°F)
  Relative Humidity:     0% to 95%, non-condensing
  Storage Range: -23°C to 60°C (-10°F to 140°F)
POWER REQUIREMENTS: 100-240 Vac, 50/60Hz input into the MPS supplied power supply.
     Current:100mV  (use shunt with 100mV/ full scale rating)
  (Max. input voltage equals +/-10V)
     Voltage:   +/- 1V    (Max. input voltage equals +/-5V)
  +/- 10V  (Max. input voltage equals +/-50V)
  +/- 100V(Max. input voltage equals +/-300V)
     Frequency                     Response:   30 Hz to 10 KHz
           Local: 3½ digit LCD display, indicating Average Current, Peak Current,                                                                                         Peak Voltage, and Power/Alarm Check, selectable with                                                                                                                                          rotary switch.
          Remote: 4 to 20 mA (Load impedance not to exceed 500 ohm) signal                                                                                                     representative of Peak Current.*
  4 to 20 mA (Load impedance not to exceed 500 ohm) signal                                                                                                     representative of Average Current.*
  4 to 20 mA (Load impedance not to exceed 500 ohm) signal                                                                                                     representative of Peak Shaft Voltage.*
  Optional latching available.  
          Local: LED’s for high and low current and high voltage.*
          Remote: Unified, single relay opening (10 watts, 0.5 A, and 100 Vdc)                                                                                           (100Ω minimum load) for high & low current and high voltage.*
NOTE:   Maximum shaft current is equal to shunt rating.                                                                                                                                                     Maximum shaft voltage is 1, 10, or 100 V (selectable).
Length: 7.4 inches (190 mm)   
Width: 7.8 inches (198 mm)  
Height:: 4.3 inches (109 mm)  
 Weight:   3.0 pounds (1.36 kg)  
*  For shaft current monitoring and alarm, a 100 mV current shunt                                                                                                                                                for 1, 2, 5, 10, 20, 50, or 100 A is required.  
   For shaft voltage monitoring and alarm, a shaft voltage sensing device is required.
Order Code: VCM-EN    


  • "We were experiencing persistent and numerous intermittent generator field ground alarms for 3 months. Had we not installed the MPS VCM-E, the failure would have forced an outage. Thank you MPS!"

    - Generator Maintenance Supervisor, U.S.