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
2
Display reads zeros and fails
PLC Slot 8, 9 or 10 output card failure or
With the BIT set to the display test, open the
to count up for BIT test
display failure.
OCP display panel to expose the sub-panel.
(applies to any display except
Locate the output card and output terminal
the total product water
for the failed display. Remove the red wire
display. For this display, refer
from the appropriate output terminal and
to item 15 below) (continued).
measure the mA (0-20mA range) between
the terminal and the wire (WP 0060).
1) If the reading is steadily
increasing, replace the display
2) If the reading is zero or near zero
mA, check the wiring for open
circuit. If not found, replace the
output card (WP 0060).
Reference:
Slot 8
Feed Water TDS
O1
MF Flow
O2
MF TMP
O3
Slot 9
RO Feed Flow
O0
RO Feed Pressure
O1
RO Reject Flow
O2
RO Feed Tank Level
O3
Slot 10
RO % Salt Rejection
O0
Product Flow
O1
Product TDS
O2
3
Display is blank.
Display failure.
Replace display (WP 0059).
4
All displays are blank. All
24 VDC circuit breaker CB230 is tripped.
Reset if tripped. If it trips again, troubleshoot
lights function normally in BIT
24 VDC circuit for shorts (WP 0060).
test.
24 VDC instrumentation power supply
Check the power supply for output voltage.
failure.
If not at least 20 VDC, replace the
instrumentation power supply (WP 0060).
Power supply on time delay relay K236
Check for voltage between K236 relay
failure
socket terminal #1 and ground. If voltage is
not found, replace the relay (WP 0060).
5
Feed Water TDS Display
PLC Slot 8 output card failure or display
Conduct BIT test and stop at the display test.
does not change as the Feed
failure.
If the display does not count up, refer to Item
Water TDS Set dial is
2 above.
changed.
PLC Slot 11 input card or TDS Set dial
Open the OCP display panel to expose the
failure.
sub-panel. Locate the Slot 11 input card.
Open the wire way cover and locate terminal
IN2+ and IN2-. Check for VDC (0-10 VDC)
between the terminals (WP 0060).
1) If voltage is noted and it changes as the
TDS Set is adjusted, (but the TDS
display does not change) replace the
Slot 11 input card (WP 0060).
0035 00-5
