Compressor Troubleshooting - Traulsen G Series Manual

II. d - Compressor Troubleshooting
Tools Required:
•
Basic hand tools
•
Clamp around amp meter
•
Volt Ohm meter
•
Basic 3 in 1(1/2 HP)
Terminology:
•
OEM – Original Equipment Manufacturer – Refers to the manufacturer of a piece of
equipment or component.
•
RLA – Rated Load Amps – The OEM test conditions amperage rating (does not
necessarily indicate the normal running amperage as conditions and applications can vary
from OEM test conditions)
•
LRA – Locked Rotor Amps – The OEM test condition lock rotor amperage rating indicating
the expected amperage at which a motor does not turn when power is applied.
•
Start Components – The capacitor and relay combinations used to start and/or run a
compressor motor consist of a start capacitor and start relay if IAA is shown on the serial
number of the compressor. If CAA is listed then there will be a potential relay along with a
start capacitor and a run capacitor.
gure 6
Note: This example shows one set of possible combinations that can be seen in the field. Resistance values
will vary between different compressors.
Ω= OHM= Unit Resistance
R= Run
S= Start
C= Common
Figure 6 shows the readings of the resistance through the compressor
motor windings. (C-S C-R). If the windings are good the start winding
resistance (C-S) will always be higher than the run winding resistance
(C-R).
17