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  • Prior to contracting with Electro-Motion, we did our own maintenance, which was very little due to lack of qualified staff and budget concerns. We have four diesel units at our various high schools and none were in great operating condition. Electro-Motion came in and provided us with professional services and brought our generators up to full operational capability. We are also considered emergency shelters due to unforseen natural disasters; and we need our generators to support this type of operation.

    John Schultz
    Director of Operations/Maintenance/Health-Safety & Transportation
    Jefferson Union High School District

    Elevator Pre-Signal Relays

    August 21, 2014

    Are you in the planning/design phase of retrofitting your elevator systems to be in compliance with current ASME codes and standards? If so, these new elevator systems require the installation of pre-signal relays. Why is this?

    With old elevator controllers, it didn't matter if the Automatic Transfer Switch transferred when the elevator cars were moving. But now, when elevator controls are upgraded from relay logic to solid state controls, the cars can no longer be in motion when the Automatic Transfer Switch transfers between hot power sources. The solid state logic in the new elevator controllers cannot handle this and it can result in damage to the controller. To circumvent this problem, a pre-signal (a delay to transfer) is sent to the elevator controller prior to transfer, allowing cars to reach the nearest floor and open their doors. The system resets after the Automatic Transfer Switch transfers and the cars are then ready to move again.

    Electro-Motion is experienced at installing pre-signal relays in the San Francisco Bay Area to address this issue. If you need to have pre-signal relays installed, call us today at 650-321-6169.


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