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We are using Frame-VI gas turbine machine and using Mark-V control system. while performing shutdown, our machine is tripping due to bleed valve position trouble alarm trip, and found that bleed valve is taking time to open, due to the poor operation of the solenoid valve. We would like to change the solenoid coil 130V DC. our new solenoid coil has three wires two are white colours and one green colour, but this two white colour does not showing any polarity. also, can anybody suggest the wiring philosophy i.e., is there any polarity issue for solenoid coil connections?