Frequently Asked Questions


  1. What is iMCC?
  2. iMCC is an intelligent and robust motor operating mechanism for disconnect switches. It offers variable speed control, monitoring, SCADA signalling & 61850/DNP3 communication, optical positioning and more. Communicate with EHT for more details.

  3. What is the difference between iMCC and iCOD?
  4. iCOD is a control and monitoring intelligent electronic module. It replaces the old electromechanical controlling technology (relays, push buttons, etc.).

    iMCC is a complete motor operating mechanism, including the motor, the positioning system, the terminal blocks, the heating system, etc. iMCC includes one iCOD for the intelligent management of control and monitoring.

  5. Can iMCC be installed on our disconnect switches?
  6. Generally, as long as there is a rotating output shaft used by the manual or motor operating mechanism to manoeuver the disconnect switch,, it is possible to install an iMCC.

    iMCC can be adapted to basically all 45 to 180 degrees and multi-turn disconnect switches. Furthermore, it covers a large range of output torque and operating times. Communicate with EHT for more details.

  7. What maintenance is required on the iMCC?
  8. The iMCC has been designed to be virtually maintenance free.

    • Cam switches have been replaced by an optical positioning system
    • Oxidation is prevented with the replacement of contact relays by solid state components and old fashion push buttons by membrane switches.
    • Motor overcurrent is detected and limited by intelligent electronics
    • The mechanical components need no lubrication
    • The housing is IP56 with robust components.

  9. What are the advantages of the optical positioning system (OPS)?
  10. The optical positioning system is easily configurable, reliable and very precise. As opposed to positioning cams that are difficult to adjust and that tend to loosen over time, the OPS can be configured with the software in a few minutes and retains the positioning during power outages.

    Furthermore, the precision of such a system assures an optimal closing of the DS in the jaw providing an ideal contact. Good contact prevents the DS from over heating and energy loss.

  11. How many output contacts are available?
  12. iMCC offers configurable and expandable relay outputs. Up to 3 outputs plug & play boards can be installed in the ASM (Auxiliary Signalling Module) for a total of 30 signals. The optional DNP3.0 IEC 61850 communication board is installed in the ASM.

  13. How long it takes to install the iMCC?
  14. EHT provides a simple questionnaire to be filled by the customer for factory pre-configuration purpose of the iMCC. Information such as motor and control supply voltages, DS type, amount of contact required, layout measurements, etc.

    The installation time of the motor operating mechanism varies based on many factors, a few examples are:
    1. Pre-configuration maintenance time; lubrication and alignment.
    2. Validity of the layout information provided for the manufacturing of the brackets versus the machining tools available for the drilling and machining if needed.
    3. Type of wiring performed; use of existing wiring or addition of cables for wiring alarms signals.
    4. Necessity of fine-tuning during the configuration; varies based on the DS design and conception.

    The configuration can take between 1h30 and 3h for the first configuration of one specific DS type. Thereafter, the upload of the configuration to another DS of the same type takes about 20min, which facilitates greatly the configuration process for a DS fleet of one particular type.

  15. How does the variable speed control decrease arc time?
  16. The fast, but gradual acceleration when moving out of the contact fingers decreases the arcing time and decrease the negative effects related to it. Depending on the DS type, a 50% reduction in arc time can be realized.

  17. What are the advantages of arc reduction?
  18. The arc is harmful for the DS contact fingers and causes harmonics damaging various components of the network like the insulating paper in the power transformer coils. Decreasing the arc time contributes to reduce exposure time and therefore increases the affected components’ lifespan.

  19. What are the parameters monitored and recorded by the iCOD?
  20. Up to 400 operations are recorded in the iCOD on board memory, the most recent operations replacing the oldest.

    The recorded parameters:

    • DS status
    • Alarm status
    • Motor voltage
    • Motor current
    • Motor torque
    • Motor speed
    • DS positioning
    • Temperature
    • Humidity
    • Date & time

  21. How are alarms managed by iCOD?
  22. Based on the monitored parameters, iCOD detects various problems and generates error codes displayed locally. Each of these error codes are classified into two categories; alarm 1: DS up and running, but a minor failure was detected (ex. Temperature sensor faulty); alarm 2: DS out of service, a major failure requiring immediate attention was detected. iCOD generates two signals for alarm 1 and 2 to the operator.

  23. Do you have a local agent in our region?
  24. EHT has agents in many countries around the world; please communicate with us for details.