Troubleshooting Guide - Standard Electro - Sullair LS-120 series Operators Manual And Parts Lists

8.1 TROUBLESHOOTING- STANDARD ELECTRO-
MECHANICAL
The information contained in the Standard Electro-
Mechanical Troubleshooting chart has been com-
piled from field report data and factory experience.
It contains symptoms and usual causes for the
described problems. However, DO NOT assume
that these are the only problems that may occur. All
available data concerning a problem should be sys-
tematically analyzed before undertaking any repairs
or component replacement procedures.
A detailed visual inspection is worth performing for
almost all problems and may avoid unnecessary
8.2 TROUBLESHOOTING GUIDE-STANDARD ELECTRO-MECHANICAL
SYMPTOM
COMPRESSOR WILL NOT
START
COMPRESSOR SHUTS DOWN
WITH AIR DEMAND PRESENT
TROUBLESHOOTING- ELECTRO-MECHANICAL
PROBABLE CAUSE
Main Disconnect Switch Open
Line Fuse Blown
Control Transformer Fuse Blown
Motor Starter Overloads Tripped
Low Incoming Line Voltage
Loss of Control Voltage
Low Incoming Voltage
Excessive Operating Pressure
Discharge Temperature Switch Open
additional damage to the compressor. Always
remember 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.
Should your problem persist after making the rec-
ommended check, consult your nearest Sullair rep-
resentative.
REMEDY
Close switch.
Replace fuse.
Replace fuse.
Reset. Should trouble persist, check whether
motor starter contacts are functioning proper-
ly.
Check voltage. Should voltage check low,
consult power company.
Reset. If trouble persists, check that line
pressure does not exceed maximum operat-
ing pressure of the compressor (specified on
nameplate).
Consult power company.
Defect in line pressure switch; check pressure
at which contact points open.
Separator requires maintenance; check main-
tenance indicator under full load conditions.
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.
Cooling water temperature too high; increase
water flow (water-cooled only).
Section 8
39