We have a rotary screw IR compressor 50hp with intellysis controller. It shuts down and displays Start Fault 1SL. any suggestions?

check relay

Vsd fault 2 is a current imbalance. Check your current readings and compare them to those on the intellysis display they should match, also check for a imbalance in amps. After that it gets more complicated using board diagnostics etc

STARTER FAULT 1SL (2SL)- This will occur if the
starter contacts open while the machine is running. It
will also occur if the machine is given the stop
command and the starter contacts do not open. 1SL
refers to the auxiliary circuit on starter contact 1M. 2SL
refers to the auxiliary circuit on starter contacts 2M
and 1S.

I've a ingersoll compressor ssr ep 20 which is shutting down on high airent temperature.

OK, Compressor should be shut down and showing (ready to start) in display. Press load/unload button once then press hidden right button within 3 seconds. This will let you access the set point program. It will include language, temperature and pressure, rated pressure,etc. Make sure you look at the data tag affixed to the unit and see what the rated pressure is for your unit. You can endanger yourself and equipment by over pressurizing the components of the compressor.

I use to start up a 25 HP Ingersol screw type compressor. The only alarms I got were from power spikes which just needed the reset button to be pushed, then the on button - and the low oil sensor would shut it down and give an alarm when the tank was about half way down. They will blow up with no oil so there is a saftey margin on oil level.

This is letting you know the motor rotation is incorrect. If this is a new unit or has just been installed or other rewiring work done in your plant etc. you need to get your electrician to roll 2 of the 3 incoming power leads. If this compressor has been in service and operating you have a vacuum switch or transducer possibly bad. you also need to check the transducer line or vacuum switch line ( both are normally 1/4 inch plastic tubing) for tightness and leaks. For example the line has rubbed a hole in it. When you try to start the unit the transducer does not see the required vacuum. The controller interrupts this low or no vacuum as the rotation is incorrect and thus gives a check motor rotation alarm and shuts down.

Does this unit have an intellysis controller. If so it also has a pressure transducer. The pressure transducer may need calibration. Also if this happen during freezing weather you may have condensate that froze in the sensor line. This would not allow the transducer or pressure switch to sense the correct line pressure which could cause oil to be blown out the air filter. If it does it during non freezing temps I would focus my attention on the minimum pressure check valve.

1. Check oil level 2. Check Thermostatic Valve

I have a ingersoll compreesor that keeps shuting down on high discharg air temp