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We have currently experienced low lift pressure on start-up of our GE 7FA unit. The pressure switch 63QB-1 switched and provided the low lift oil pressure alarm just as the unit was rolling up - approximately 75RPM.
We have verified the switch and cross checked against a pressure transmitter we have installed on the lift oil circuit.
Reviewing the trend data the lift is approximately 3050 psi on turning gear and as the unit starts to roll up it dropped to 2650 psi at 75 RPM and recovers to 3050 psi at approximately 400 rpm. This is the first time we have experienced this issue.
Any feedback would be appreciated.
We have verified the switch and cross checked against a pressure transmitter we have installed on the lift oil circuit.
Reviewing the trend data the lift is approximately 3050 psi on turning gear and as the unit starts to roll up it dropped to 2650 psi at 75 RPM and recovers to 3050 psi at approximately 400 rpm. This is the first time we have experienced this issue.
Any feedback would be appreciated.