TM 55-1930-209-14&P-5
b.
Installation
(1) Install switch In reverse order of removal In step a
(2) Check operationally that remote switch operates normally
4-7.2.16. Pressure set motor controller
WARNING
Before servicing water pressure set, check that motor controller Is electrically dead before starting repair or
removal. Redtag power panel circuit breaker 11P15 with: WARNING - DO NOT ACTIVATE - REPAIRS BEING
MADE.
4-7.2.16.1. Cleaning and inspection
a.
Make sure pressure set motor controller is electrically dead before starting cleaning or Inspection by
opening (OFF) circuit breaker 11 P15 on power panel Redtag circuit breaker with WARNING - DO
NOT ACTIVATE- REPAIRS BEING MADE
b.
Open motor controller door and vacuum clean or clean with electrician's brush
c.
Check fuse Replace If necessary
d.
Visually Inspect for indications of burns, corrosion, loose connections, or damaged parts Clean
corrosion from contacts and terminals, tighten loose connections and replace damaged parts
4-7.2.16.2. Test and repair
a.
Close controller door and check line voltage coming in across points Al and B1 (Figure 4-3) If
voltage between lines Is 0, power source Is at fault If voltage Is 220, go to step b
b.
Check line voltage to HI/LO pressure switch across points S3P1 and S3P2 (Figure 4-3) when
MAN/OFF/AUTO switch Is In AUTO. If voltage is 110, check switch continuity
(1) Release pressure from pressure set
(2) Check continuity across points S3P1 and S3P2
(3) If continuity Indicates open circuit, replace pressure switch
c.
Check voltage going out across points T1 and T2. If voltage Is 0, check motor controller continuity
using Figure 4-3 as given below If voltage Is 220, pressure set Is malfunctioning Repair or replace
pressure set as given in paragraph 4-7 2 2.
(1) After securing circuit breaker 11P15, open motor controller cover and clean by vacuuming or
with electrician’s brush
(2) Visually Inspect fuse contacts and connections for burns, looseness, and corrosion. Clean
and tighten or replace damaged fuse contacts or connections Inspect wiring for breaks or
other damage Replace wiring If necessary
(3) After correcting condition, reapply power If motor controller does not operate, go to step (4)
(4) Check disconnect switch voltage across points A1 and B2 and A2 and B1. If no voltage is
present across one pair of points, replace disconnect switch. If voltage is present across
both pairs of points, go to step (5)
(5) Check relay voltage across points L1 and L5 and L2 and L4 If a voltage Is present only
across one pair of points, replace relay If no voltage Is detected between both pairs of points,
go to step (6).
(6) Check transformer voltage across points X1 and X2 If voltage is 0, replace transformer If
voltage reading Is 110, go to step (7)
4-20
