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 TM 55-1905-219-14-8
4-5. GENERAL (Continued).
Table 4-17. Macerator Pump - Electronic Controls - Troubleshooting.
NOTE
Refer to paragraph 4-15 for maintenance instructions.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Pump does not operate when commode or urinal is flushed.
Observe operation of pump.
a.
Check 115 VAC supply power coming into the Timing Control Box by
measuring the voltage across TB-1 and TB-2. If there is no voltage check
power supply.
b.
Push "RESET" button on motor starter and recheck operation.
c.
Inside the Timing Circuit Control Box, measure the voltage across TB-1 and
TB-3. At the same time have someone flush the commode or urinal. Voltage
should be 115 VAC whenever the commode or urinal is flushed. If no voltage
is detected check wiring from microswitch or flow switch to TB-2 and TB-3. If
wiring is OK. readjust or replace microswitch or check water flow through flow
switch. Replace flow switch.
d.
Check for faulty time delay relay TD, replace if necessary.
2. Pump operates only when microswitch is depressed or water is running through flow switch.
Operate pump by depressing microswitch or by flushing commode or urinal.
Control relay is not holding ocntacts CR. Replace control relay.
3. Pump does not turn off after 10 seconds of operation.
Time duration of pump operation.
Time delay relay is faulty or the timing resistor is not 200 K ohms. Replace resistor
and/or replace time delay relay.
4-63
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