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@REPLYADDR Leon <lcb11211@swbell.net>
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On 7/12/2023 6:47 PM, DJ Delorie wrote:
>
> So my big shop compressor has two problems.
>
> First, when it starts, it starts suddenly. Enough to startle whoever`s
> in the shop, which is not just annoying but dangerous.
>
> Second, when it starts, it`s now making a squeak sound for a moment as
> well as the expected noises. I mean, a LOUD squeak, like it`s trying to
> rip the pulleys off. (oil level is fine)
>
> So I might as well address both problems at the same time.
>
> The usual litany of questions follows...
>
> Has anyone experienced a loud squeak at compressor startup? I assume
> I`ll be disassembling the whole drive chain and inspecting everything,
> but I might as well have something to look for.
YES! I thought it was more like a bird chirp. The issue was the reed
valve plate gasket failed. The reed valve has a self adhered gasket,
meaning on mine, the gasket and reed valve had to be replaced as a unit.
Relatively inexpensive.
If that leak is significant the squeak could possibly be continuous and
or result in total compression loss of that particular
cylinder/cylinders. A motor may start much more quickly if there is
less or no resistance.
Another thought, the pressure relief valve is not closing after the
pressure is released at shut down. If it remains open there will be a
lot less resistance on the motor. It makes that short hiss when the
motor shuts down. If that valve remains open the motor will go to top
speed almost instantly. It should only remain open for a brief moment
until the motor begins to spin.
>
> Has anyone tried to soft-start a compressor? I`ve added hard-start kits
> to motors before to avoid current spikes, but nothing designed to ramp
> up the speed itself. Is switching to three phase and adding a VFD to
> ramp up the speed overkill, or even possible?
Another thought, 240 volt motors tend to start with a jolt if properly
wired, because of less voltage drop. Have you recently changed the
voltage for the motor?
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