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 TM 55-1905-220-14-8
4-21. SEWAGE SYSTEM MOTOR CONTROLLER AND GAGE PANEL-MAINTENANCE
INSTRUCTIONS
a. Description of Operation.
(1) System start. With power on the lines, and the disconnect closed, the "POWER ON" indicating light
is energized. To start the system, press the SYSTEM START push button to energize the self-
maintaining Relay UV. UV contacts close providing power to the rest of the system, energizing the
"TANK EMPTY" and "SUM ALARM" indicating lights. Press the SUM ALARM RESET pushbutton to
energize the self-maintaining Relay SA. SA contacts open to cancel the alarm indication(s).
(2) Tank level. When the tank level exceeds "EMPTY", the transistor relay LR1 is energized. LR1
contact open to de-energize the "TANK EMPTY" light and close to allow manual starting of the
effluent pump. When the tank level exceeds "FULL", Transistor Relay LR2 is energized, the LR2
contacts open to stop the vacuum pumps and initiate a summary alarm, and close to energize the
"TANK FULL" light. when the LR2 is de-energized, the vacuum pumps restart, the alarm is canceled,
and the tank FULL light is de-energized. When LR1 is de-energized, the effluent pump is stopped
and the "TANK EMPTY" light energized.
(3) Vacuum pumps.
(a) In order for the vacuum pumps to operate in the normal LEAD/LAG/ALTERNATION manner,
press the Vacuum Pump No.1,and Vacuum Pump No.2 AUTO, maintaining type, push-
buttons.
(b) When PS1 contacts close on decreasing vacuum, (14 inches HG.), self maintaining Relay,
1CR ,is energized. 1CR contacts close to energize contactor 1VP, the "VACUUM PUMP
NO.1 MOTOR RUN" indicating light, and the self-maintaining Relay 3CR. 1VP main contacts
close to connect the Vacuum Pump No.1 Motor across the lines.
(c) If PS2 contacts close due to a further decrease in the vacuum (13 inches Hg.), contactor 2VP
and the "VACUUM PUMP NO.2 MOTOR RUN" indicating light are energized. 2VP main
contacts close to connect the Vacuum Pump No.2 Motor across the lines.
(d) 1VP and 2VP auxiliary contacts close to energize the timer VPTR. If the vacuum pump (s)
run longer than 20 Min, VPTR contacts open to drop the1VP,2VP,andSA,removing the
motors from the line, and initiating summary alarm(s).
(e) When PS1 and PS2 contacts open on increasing vacuum (16 inches Hg.), 1CR, 1VP, and
2VP are de-energized, removing the motors from the line.
4-726
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