Section 6
TROUBLESHOOTING
29
6.1 TROUBLESHOOTING-- STANDARD ELECTRO-
MECHANICAL
The information contained in the Standard Electro-
Mechanical T roubleshooting chart has been com-
piled from field report data and factory experience. It
contains symptoms and usual causes for the de-
scribed problems. However, DO NOT assume that
these are the only problems that may occur. Allavail-
abledataconcerningaproblemshouldbesystemati-
cally analyzed before undertaking any repairs or
component replacement procedures.
A detailed visual inspection is worth performing for
almost all problems and may avoid unnecessary
additional damage to the compressor. Always re-
member to:
1. Check for loose wiring.
2. Check for damaged piping.
3. Check for parts damaged by heat or an electrical
short circuit, usually apparent by discoloration or
a burnt odor.
Shouldyourproblem persist after making the recom-
mended check, consult your nearest Sullair repre-
sentative.
TROUBLESHOOTING-- STANDARD ELECTRO-MECHANICAL
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR WILL NOT START Main Disconnect Switch Open Close switch.
Line Fuse Blown Replace fuse.
Control Transformer Fuse Blown Replace fuse.
Motor Starter Overloads Tripped Reset. Should trouble persist, check
whether motor starter contacts are
functioning properly.
Low Incoming Line V oltage Check voltage. Should voltage check low,
consult power company.
COMPRESSOR SHUTS DOWN WITH Loss of Control Voltage Reset. If trouble persists, check that line
AIR DEMAND PRESENT pressure does not exceed maximum oper--
ating pressure of the compressor (specified
on nameplate).
Low Incoming V oltage Consult power company.
Excessive Operating Pressure Defect in line pressure switch; check pressure
at which contact points open.
Separator requires maintenance; check
maintenance indicator under full load condi--
tions.
High pressure shutdown switch is defective;
replace.
Defective valve; regulator valve should
cause inlet valve to close when the pressure
switch contacts open. Repair if defective.
Defective blowdown valve; blowdown valve
should exhaust sump pressure to 10 to
15 psig (0.7 to 1.0 bar) when maximum
operating pressure is reached. Repair if
defective.
Discharge Temperature Switch Open Cooling water temperature too high;
increase water flow (water--cooled only).
Cooling water flow insufficient; check water
lines and valves (water--cooled only).
Cooler plugged; clean tubes. If plugging
persists, install water conditioner
(water--cooled only).
Cooling air flow restricted; clean cooler and
check for proper ventilation.
Ambient temperature is too high; provide
sufficient ventilation.
Low fluid level; add fluid.
Clogged filter; change the fluid filter element
and change the bearing filter element if
maintenance indicator shows red.
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