ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
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TROUBLESHOOTING PROCEDURES
OPERATOR/CREW TROUBLESHOOTING PROCEDURES
Table 7. General RO System Troubleshooting Continued.
ITEM
MALFUNCTION
POSSIBLE CAUSES
CORRECTIVE ACTION
5
RO Feed Tank Low Level
Reset the PLC as follows:
Alarm and HP pump stops.
- Set Mode to Standby.
- Drain RO feed tank.
- Open the MAIN circuit breaker at the PDP
(OFF position)
- Then close the MAIN circuit breaker (ON)
1) MF Feed Tank almost empty.
(1)
Check level in MF Feed Tank. It
should never be less than one-third
full. If it is, troubleshoot raw water
system as described in Table 1.
2) Level measurement loop failure
(2)
Open the RO Feed Tank cover. If the
actual level is not almost empty, the
level measure loop has failed. Notify
Unit Maintenance.
3) MF Filtrate Flow control failure.
(3)
Restart. After the first backwash, the
level should be back between 95%
and 105% when the next backwash
begins. If the level is not reached and
the alarm repeats, switch to manual
flow control and continue operation.
Notify Unit Maintenance. If the flow
cannot be controlled in manual,
shutdown until the problem is
corrected.
6
RO Feed Pressure Low alarm
Reset the PLC as follows:
(during normal operation) and
- Set Mode to Standby.
HP Pumps stop automatically
- Drain RO feed tank.
(or will not start). RO Feed
- Open the MAIN circuit breaker at the PDP
Pump remains on.
(OFF position)
- Then close the MAIN circuit breaker (ON)
- Follow normal startup procedures.
- Watch HP Pump Feed Pressure gage
PI-202.
If the system was in backwash and the RO
tank level is low, see response for RO feed
tank low level alarm, item 5.
Pressure gage PI-202 does not drop
below 35 psig and alarm repeats.
1) Pressure transmitter PT-201 failure
1) Replace PT-201 with the spare located
in the BII (WP 0041). Continue operation.
2) After replacing PT-201 continue
(2) Notify Unit Maintenance.
operation. If the alarm repeats, the failure
is in the measurement loop electrical
system.
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