ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
0034 00
TROUBLESHOOTING PROCEDURES
UNIT TROUBLESHOOTING PROCEDURES TACTICAL WATER
PURIFICATION SYSTEM (TWPS)
Table 7. General RO System Troubleshooting Continued.
ITEM
MALFUNCTION
POSSIBLE CAUSES
CORRECTIVE ACTION
7
Cleaning solution does not
Tank Heater Switch or PLC Slot #1 Input
Open OCP display panel to expose the
(cont.)
heat up with heater switch
card failure.
sub-panel (WP 0060). Set Main CB to ON.
set to AUTO 2.
Make sure there is water in the RO feed
tank. Set the switch to AUTO 2. Check the
Or
Slot #1 LED lights. If channel 12 is not ON:
1) Open the Slot #1 wire-way cover.
The solution does not heat
Locate the IN12 terminal. Check for
up at least 30 degrees in 30
AC 110-volts between IN12 and
minutes with the heater
ground.
switch in AUTO 2.
2) If voltage is found, replace the Slot
#1 Input card (WP 0060).
(Continued)
3) If voltage is not found, replace the
Tank Heater Switch (WP 0059).
4) Repeat for the IN12 terminal.
Failure of PLC Slot #4 Output card or
Open the PDP. Set the main breaker to
failure of the heater contactor actuating
ON. Make sure there is water in the RO
coil failure.
feed tank. Set the heater switch to AUTO
2. If one or both contactors fail to pull in:
1) Open the Slot #4 wire-way cover.
Locate the O10 and 11 terminals
Check for AC 110 volts between O10
and ground and O11 and ground.
2) If voltage is not found at both
terminals, replace the Slot #4 output
card (WP 0060).
3) If voltage is found, replace the related
contactor. For terminal O10 replace
contactor K511. For terminal O11
replace contactor K512 (WP 0063).
Broken heating element(s).
Open the heater terminal boxes. Remove
the power cable wires. Check each heater
element for resistance. If an open circuit is
found, replace the heater (WP 0052).
8
Heaters do not turn off when
Temperature transmitter TT-201 or
Open the OCP display panel to expose the
RO Feed Tank temperature
electrical wiring failure.
sub-panel. Locate the Slot #12 card. If the
rises above 110 degrees F
channel #5 light is blinking:
1) Replace the temperature transmitter
2) If the light blinks after replacing
TT-201, troubleshoot the wiring.
Temperature transmitter TT-201 or Slot
If the light is not blinking, remove the wire
#12 input card failure.
from terminal IN5 and measure DC mA
between the wire and the terminal.
1) If the reading with the RO Feed Tank
temperature at 110 degrees F is
approximately 11 mA, replace the
Slot #12 input card (WP 0060).
2) If the reading is less, replace the
temperature transmitter (WP 0062).
0034 00-25
