ARMY TM 10-4610-309-14
MARINE CORPS TM10802A-14/1
0035 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
TROUBLESHOOTING PROCEDURES
UNIT TROUBLESHOOTING - TWPS CONTROL SYSTEMS
Table 2. OCP Display and Instrument Loop Troubleshooting Continued.
ITEM
MALFUNCTION
POSSIBLE CAUSES
CORRECTIVE ACTION
7
TMP cannot be adjusted to
2)
If reading is approximately 20mA,
cont
zero (with TWPS properly in
perform continuity checks with PDP
STANDBY).
main breaker OFF. Perform continuity
check on wiring from input card to
Or
connector pins. Check for short circuit
between pins A and B with connector
TMP reading is suddenly very
disconnected from transducer and both
high and the TMP High alarm
wires disconnected from input card.
is on (continued).
Replace cable if short circuit found.If
short circuit not found, replace PT-101.
3)
If problem re-occurs replace Slot 12
input card.
Open the OCP display panel to expose the
Pressure Transmitter PT-102 failure or
sub-panel. Locate the Slot 12 input card
open circuit failure.
replace card.
1) Remove IN1+ wire and turn terminal
screw back in. Measure the mA (4-
20mA range) between the wire and the
terminal
2) If reading is approximately 20mA,
perform continuity checks with PDP
main breaker OFF. Perform continuity
check on wiring from input card to
connector pins. Check for short circuit
between pins A and B with connector
disconnected from transducer and both
wires disconnected from input card.
Replace cable if short circuit found.
3) If short circuit not found, replace PT-
102.
4) If problem re-occurs replace Slot 12
input card.
PLC Slot 11 input card or MF
Open the OCP display panel to expose the
Transmembrane Zero Adjust dial failure.
sub-panel. Locate the Slot 11 input card.
Open the wire way cover and locate terminal
IN1+ and IN1-. Check for VDC between the
terminals (WP 0060).
1) If voltage is noted and it changes as the
TMP Zero is adjusted, (but the TMP
display does not change) replace the
Slot 11 input card (WP 0060).
2) If voltage is noted but it does not
change as the TMP Zero is adjusted,
replace the MF Transmembrane Zero
Adjust (1000 Ohm) potentiometer (WP
0035 00-8
