Converting a rotary screw compressor from high voltage 460 to low voltage 208 3-P. Motor rewired but I believe that the transformer needs rewired also. Rodgers BG-7.5H/A-B-D5 rotary screw compressor

SOURCE: how to test high voltage transformer

#1 Turn off and un-plug the unit for 20 minutes

#2 There is as real risk of electrocuting yourself.

#3 Short the capacitor wit a screwdriver. BE READY for an arc or pop.

#4 You need a special high voltage probe to measure the high voltage. We're talking THOUSANDS of VOLTS here DANGER -DANGER - DANGER!

#4 If you want to try, you first have to DISCONNECT the capacitor from the circuit.

#5 DON'T re connect the power. Measure the resistance of the SECONDARY of the transformer (one lead goes to the capacitor). TELL ME WHAT THE MEASUREMENT IS..

#6 The rectifier could be bad (which is connected to the Capacitor) Usually - if one of th components is bad, it'll blow one of the internal fuses.

SOURCE: ROTARY SCREW COMPRESSOR TRIPPING

Possibly water in the air tank ? Or Ice covering the inlet or screen into the tank? DOes it have a belt? or direct drive? Remove the belt and try to turn by hand. See if its the motor or the compressor is tight. If it rolls free possible a chack valve is hung up or has a broken spring OR yuo have a bad capicator or centrifical sw going to the start capicator. Check amp draw with no pressure on the compressor. tank open. If it runs extra time its somethign while under load. If it still cuts out you need to sepperate and discover if its a mechanical or electrical problem.
HOPE THIS HELPS PLEASE RATE ME ACCORDINGLY AND GOOD LUCK 

SOURCE: My rotary screw air compressor model SSREP100H

It's just too hot. Blow out the radiator weekly. There is an oil temp switch that might need replaced but the radiator is the most common problem with screw compressors. You can check the settings in the control panel, where you turn it on and off. It should be set for a high temp of 185°.

SOURCE: 40 hp ingersoll rand rotary screw air compressor keep shutting

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

SOURCE: Where can I get a timer motor for an Malibu low voltage transform

The PB912M10 timer clock motor is not sold separately. Aug 2010.
If power pack transformer still works: buy cheap plug-in timer, set power pack to override, and plug power pack into cheap timer.
With receipt, power pack might still be under warranty.
Open following link for power pack tips and resources:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html