3-49. MINI-PROBE,
TM 55-2090-201-14&P
L O C A T I O N
I T E M
A C T I O N
R E M A R K S
1.
Type A mini-probe
Meter
Reading
Test Procedure
(VDC)
Test Conditions
Remarks
1. To verify 24
VDC output of
power supply:
A. Unlock,
open con-
trol pan-
el (1)
and,
B. Connect a
test meter
across ter-
minal con-
tacts 8
and 9 on
terminal
board TB1
2. Verify the
operation of
first stage
(prefilter)
mini-probe
(4) and the
printed cir-
cuit board:
1. Auto controls
1.
switch (2) and
facility power
are on, supply
pump switch (3)
is off.
24
2. Facility power
2.
and auto controls
switch (2) are
on:
pump switch
off; both mini-
probe (4 and 5)
immersed in
water.
The normal opera-
tion of the mini-
probe is to
transmit a 24 VDC
signal to open
the solenoid
operated oil dis-
charge valve and
close the sole-
noid operated
water discharge
valve only when
the mini-probe
senses oil or
air.
The mini-
probe should be
If there is no
output power,
check that facil-
ity power is on.
Electrical input
lines are con-
nected properly.
There should be
no loose or
broken wires.
Check that the 1-
amp fast blow
fuse is not de-
fective 230 VAC
facility input
power can be read
across terminal
contacts 14 and
17.
3-370
