BOLT 0S1593 - Caterpillar

Operating the UMBC
Illustration 1 g03379722
Universal Maintenance Bypass Controller (UMBC) indicator lights (4) Amber light (5) Red light"To Maintenance Bypass" Button Illuminated - MIS Breaker Closed and MBP Breaker Open
When the MIS breaker is closed, the "To Maintenance Bypass" button is illuminated. Press the "To Maintenance Bypass" button to close the MBP breaker and open the MIS breaker. The MBP breaker must close before the MIS breaker opens. Hold the button down until the "To UPS" button lights.Note: If the MBP breaker is closed, the "To UPS" button is illuminated."To UPS" Button Illuminated - MIS Breaker Open and MBP Breaker Closed
Press the "To UPS" button to close the MIS breaker and open the MBP breaker. The MIS breaker must close before the MBP breaker opens.Operational Conditions
If either the MIS or MBP breaker fails to close during one of the transfers, the other breaker will not open. The "Transfer Fail" light will illuminate.
If a breaker fails to open during one of the transfers, the other breaker will be opened and the "Transfer Fail" light illuminates.If the "Transfer Fail" light is lit, the last button pressed will be blinking. The blinking light indicates the sequence that failed.To clear the "Transfer Fail" light, the non-blinking button must be pressed. No breaker closes unless voltage is present and within tolerance at the line terminals.Note: There is also a UL listed timer. The timer will not allow the MBP and MIS to be closed at the same time for more than 4 seconds. The timer will trip the MIS breaker.
If the source of the closed breaker is invalid, which could include a dead bus, the "Break Transfer" light is illuminated.
If the "Break Transfer" light is illuminated, and the illuminated button is pushed, the closed breaker will be tripped before the open breaker is closed. One breaker must open before the other breaker closes.
The "Break Transfer" light will be lit if there is no voltage on the output. The reason for the light will be because the MBP is closed and the source has been removed. An example of a source being removed, is like an upstream breaker that has tripped.
The "Break Transfer" light will be lit if there is no voltage on the output. The reason for the break transfer is because the MIS is closed and the source has been removed.