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 TM 55-1905-220-14-8
4-21. SEWAGE SYSTEM MOTOR CONTROLLER AND GAGE PANEL-MAINTENANCE
INSTRUCTIONS (Continued).
(6) Overload.
(a) An over load condition in any of the motors will cause its respective OL contacts to open,
dropping the contactor, and to close to energize the respective "OVERLOAD" indicating light.
The motor is removed from the line.
(b) After correction of the overload condition, press the appropriate reset button to restart the
vacuum pump, and the reset and then the START/JOG pushbutton to restart the overboard
discharge pump.
(7) Vacuum pump overrun. 1VP and/or 2VP auxiliary contacts close when the vacuum pumps are
running to energize timer VPTR. VPTR contacts open after an adjustable delay to stop the vacuum
pumps and initiate a summary alarm and close to maintain VPTR. After correction of the overrun
condition, press the system stop button to drop the VPTR and then the system start button to resume
operation.
b. The following is an index to the maintenance instructions.
DESCRIPTION
PARAGRAPH
Controller
Gages Panel
c . The following is a list of the foldout illustrations located at the back of this volume.
DESCRIPTION
LOCATION
Controller Wiring Diagram
Schematic Diagram
4-728
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