Ground short ?

[AddMore22]

Compressor ----
Copeland
3 Ph
560 Volt
60Hz

Equipment
10 ton split custom made (marine)......

Story.....

I fly 120 miles in the gulf of Mexico to work on a solenoid valve .... Change it.... All is good....
I pulled a vac to 700 microns ....
Dumped recovered gas back in (on both sides) and when I went to start it tripped main breaker. So I took wires off peckerhead and checked to ground. And alas.... Grounded. So.... Does anyone know why? It worked before.... I didn't turn anything on while in vac ....

[BillDuffy]

Compressor ----
Copeland
3 Ph
560 Volt
60Hz

Equipment
10 ton split custom made (marine)......

Story.....

I fly 120 miles in the gulf of Mexico to work on a solenoid valve .... Change it.... All is good....
I pulled a vac to 700 microns ....
Dumped recovered gas back in (on both sides) and when I went to start it tripped main breaker. So I took wires off peckerhead and checked to ground. And alas.... Grounded. So.... Does anyone know why? It worked before.... I didn't turn anything on while in vac ....

When you dumped the recovered gas back in both sides was it liquid?

[DNMechanical]

I think u charged liquid in suction side. compressor was probably compressing liquid refrigerant.

[Six]

Topping off the compressor sump with liquid will trash your valves but I doubt it caused an immediate short. Is that for a drive house ?

[Six]

Was the solenoid liquid valve leaking or just inoperable ?

Did you check it before you replaced the solenoid valve ?

[AddMore22]

Was the solenoid liquid valve leaking or just inoperable ?

Did you check it before you replaced the solenoid valve ?

It was just leaking .....
It has a receiver.
Not worried about liquid in suction
It was in a VFD house.

[Nuclrchiller]

What is a "VFD house" ? What kind of device interrupts power to the compressor ? Is it a contactor or something else ? What kind of crancase heater, if any ?

[AddMore22]

"VFD" - Variable Frequency Drive- its on a drilling rig.

It's a 3 phase 600 volt ... So no cap...

Crank case heater has been disabled prior this.

I guess my main question is this ...
Is there any way the insulation in the windings of a compressor be compromised due to a vacuum?

[Nuclrchiller]

I thought "VFD" probably meant Variable Frequency Drive, but what exactly is meant by "VFD house" ? EVERYTHING has VFD ? Including compressor ? I realise it has no capacitor, at least I've never heard of a cap used to interrupt power as a means of starting and stopping something, like a compressor... The reason I ask what does start and stop, or interrupt the power to, the compressor is to determine if it is a solid state device ( like a soft starter, or a VFD ). It seems unlikley that it would be anything other that a simple contactor on something this size, but I just wanted to rule it out.

[AddMore22]

Actually it's a 10 ton with 2 5 ton Copland scrolls. And one legs is always hot with the other two going in a contractor.

[Six]

I thought "VFD" probably meant Variable Frequency Drive, but what exactly is meant by "VFD house" ? EVERYTHING has VFD ? Including compressor ? I realise it has no capacitor, at least I've never heard of a cap used to interrupt power as a means of starting and stopping something, like a compressor... The reason I ask what does start and stop, or interrupt the power to, the compressor is to determine if it is a solid state device ( like a soft starter, or a VFD ). It seems unlikley that it would be anything other that a simple contactor on something this size, but I just wanted to rule it out.

Its a seperate building on land and offshore rigs that houses all of the motor control, fuses, controls and VFDs for the DC motors on the rig.

High heat load and a critical part of any rig. You lose AC and the drives overheat and they have to stop drilling.

A multi million dollar operation is put on hold until you get the AC repaired.

Roughnecks and tool pushers looking at you sideways.

[Nuclrchiller]

Actually it's a 10 ton with 2 5 ton Copland scrolls. And one legs is always hot with the other two going in a contractor.

Was unit powered up ( even though not running ) during evacuation ?

[Nuclrchiller]

Its a seperate building on land and offshore rigs that houses all of the motor control, fuses, controls and VFDs for the DC motors on the rig.

High heat load and a critical part of any rig. You lose AC and the drives overheat and they have to stop drilling.

A multi million dollar operation is put on hold until you get the AC repaired.

Roughnecks and tool pushers looking at you sideways.

Ohhh..., OK. Thanks.