Sullair LS-25 Operator's Manual And Parts List page 55

7.8 TROUBLESHOOTING GUIDE- SUPERVISOR (CONTINUED)
SYMPTOM
COMPRESSOR WILL NOT START
(CONT.):
MOTOR OL MESSAGE
T-1, T-2 FAIL MESSAGE
P-1, P-2, P-3, P-4 FAIL MESSAGE
MOTOR WILL NOT START,
E-STOP MESSAGE
LO WATER MESSAGE
(Water-cooled packages only)
COMPRESSOR SHUTS DOWN
WITH AIR DEMAND:
MOTOR OL MESSAGE
P1-LO
P3-LO
HI T1, HI T2 MESSAGE
PROBABLE CAUSE
Motor Starter Overloads Tripped
Low Incoming Line Voltage
Temperature Transducer Failure
Pressure Transducer Failure
Emergency Switch Open (depressed)
Water Pressure Feed Below 10 psig
(0.7 bar)
Motor Starter Overloads Tripped
Low Incoming Line Voltage
P1 is Less Than 10 psig (0.7 bar)
Loss of Oil
Plugged Oil Filter
P3 is Less Than One Half of P1
Discharge Temperature Exceeded
235°F (113°C) Because:
Ambient temperature exceeded105°F
(41°C)
Fluid Level in Sump is Too Low
Thermal Valve Malfunctioned
Cooler Fins are Dirty
Water Flow is Low (water-cooled pack-
ages only)
Water Temperature is High (water-cooled
packages only)
Cooler is Plugged (water-cooled pack-
ages only)
Temperature RTD Malfunction
MAINTENANCE
REMEDY
Reset after heater elements cool down.
Should trouble persist, check whether motor
starter contacts are functioning properly.
Check voltage. Should voltage check low,
consult power company.
Check connections from transducer. If adequate,
replace transducer.
Check connections from transducer. If adequate,
replace transducer.
Close switch (pull).
Check cooling water supply (i.e., closed valves).
Reset after heater elements cool down. Should
trouble persist, check whether motor starter con-
tacts are functioning properly.
Check voltage. Should voltage check low, consult
power company.
First, check starter wiring. If discharge pressure
above 10 psig (0.7 bar) was evident, then sensor
is at fault -check connections from transducer. If
adequate, replace transducer.
Check oil level.
Replace filter.
Improve local ventilation (i.e., remote intake of
process and/or cooling air).
Check/correct fluid level.
Check/replace thermal valve.
Clean cooler fins.
Check cooling water supply (i.e., closed valves).
Increase water flow, lower water temperature.
Clean tubes and/or shell - if tube plugging persists,
provide cleaner water.
Check connections from RTD. If adequate,
replace RTD.
Section 7
49