Dear Sir/madam

We have two GA15 FF compressors one working and the other standby. One of the compressors (Compressor 2) is running smoothly while the other has a problem that trips the motor.  We have taken the following measurements on both compressors as detailed hereunder:

Atlas Copco rotary screw Compressor: GA15 FF 7.5CE 400 FM

Data

Compressor 1 (having problems)

Compressor 2

(working smoothly)

Remark

Relay setting

21 A

21 A

Measured phase current:

R

S

T

31.4

33.1

32.6

31.5

32.3

30.5

Temperature

Loading

Unloading

790c

(70-71) 0c

720c

670c

These remarks are valid only for compressor 1

§ Motor switches off after running for sometime

§ Oil  finds its way into the air filter

§ Temperature of the oil air separation thank is very high

N.B:  1. These two compressors are installed side by side; one working and the other standby

1.       Both are getting power from the same line


2.         Both compressors have two independent breakers


3.         Compressor 1 run only for 5 hours when the problem started to transpire

Please advise on how we should go about resolving the problem?

 Looking forward to your prompt action,

With kind regards,

Tadesse Woldeyes