Gardner Denver EBB BB-7.5 HP Operating And Service Manual page 45

SYMPTOM
Oil Carry–Over (Continued)
"CHANGE SEPARATOR" light
(Flashing or on steadily)
ON STARTUP
"CHANGE SEPARATOR" light
(Flashing or on steadily)
WHILE RUNNING
"MOTOR OVERLOAD"
shutdown.
POSSIBLE CAUSE
7. Operation at elevated
discharge temperatures.
8. Scavenge line check
valve failure.
9. Water condensate in oil.
1. Separator differential is
greater than 8 psid (.5 Bars).
2. Bad Transducer.
3. Misadjusted minimum
pressure valve.
4. Sticky minimum pressure
valve.
5. Defective minimum
pressure valve.
[Won't set at 65 psig (4.5 Bars)]
1. Separator differential is
greater than 8 psid (.5 Bars).
2. Electrical noise creating
false readings.
3. Oil reservoir is overfilling.
4. Defective transducer.
5. Plugged aftercooler, due
to freezing or varnishing.
1. Running compressor at a
pressure over nameplate
pressure.
2. Incoming voltage low or
high.
3. Imbalanced voltage
(check phase to phase).
13–8–612 Page 35
REMEDY
7. Reduce temperature. See
High Discharge Air
Temperature, page 34,
this section.
8. Replace check valve.
9. Check oil reservoir tempera–
ture and if low, change
thermal mixing valve element
to higher temperature.
1. Change Separator.
2. Verify readings with mechan–
ical gauges. If defective,
replace with 88H242.
3. Set minimum pressure valve
at 65 psig (4.5 Bars).
4. Disassemble and clean.
5. Rebuild or replace.
1. Change Separator.
2. Make sure transducer wires
are kept to a minimum length
and are twisted.
3. Fill to proper level (see
FIGURE 5–1, Section 5,
page 24).
4. Verify readings with mechan–
ical gauges. If defective,
replace with 88H242.
5. Clean or replace aftercooler.
1. Lower pressure to nameplate.
2. Consult your power company.
3. If imbalance exceeds 5%,
check incoming power.