"Bob La Londe" wrote in message news:ug4hq7$1cjmf$1@dont-email.me...
In my shop I run a 5HP Ingersol Rand 2 stage compressor. The first
motor lasted just a little longer than the warranty, but until it let
the magic smoke out it started the compressor every single time.
-------------------------
I put this PZEM-061 on my mongrel 80 gallon compressor to observe and
compare the current draw to the motor's rating, to match the motor pulley to >a replacement compressor pump.
https://tinyurl.com/yhjfzcxc
In my shop I run a 5HP Ingersol Rand 2 stage compressor. The first
motor lasted just a little longer than the warranty, but until it let
the magic smoke out it started the compressor every single time. I had
an extended warranty so eventually when the service company got tired of >lying to me and lying to the warranty company I eventually got a new
motor. Not the same motor (thank goodness), but also not the same frame
size motor.
(In the interim I ran a cheap motor I bought on-line.)
The interim motor would trip its thermal protector all the time. Drove
me bonkers. The new motor I eventually got also trips its thermal
protector, but not as often. The trip is just about always on startup.
The unloader appears to be operating correctly.
All of the motors are/were single phase induction motors with a great
big pair of caps on them. (run and start caps) In my research into the >original crappy motor from Ingersol Rand (reviews were insanely bad
including claims of bursting into flame) a couple people recommended >installing a soft start kit on the motor or any replacement motor.
Anybody have a soft start for dummies guide they can point me to that
might be appropriate for this application?
I also considered a reduced pulley size to reduce load on the motor, but
then the motor would run longer each time it cycled on. I don't know
what the balance of heat build up would be from longer run, verses less
load. Compressor duty motors are not intended to run continuously.
I also considered a 3 phase motor with a VFD and a soft start programmed
into the VFD, but 5HP 3 phase motors aren't cheap and neither are VFDs
big enough to drive them on single phase.
If this thing exploded tomorrow I'd be tempted to go back to the 3.7 HP >compressors I ran before, and just plan to repair them every couple years.
PZEM-061
On Tue, 10 Oct 2023 15:04:55 -0700, Bob La Londe <none@none.com99>
wrote:
In my shop I run a 5HP Ingersol Rand 2 stage compressor. The first
motor lasted just a little longer than the warranty, but until it let
the magic smoke out it started the compressor every single time. I had
an extended warranty so eventually when the service company got tired of
lying to me and lying to the warranty company I eventually got a new
motor. Not the same motor (thank goodness), but also not the same frame
size motor.
(In the interim I ran a cheap motor I bought on-line.)
The interim motor would trip its thermal protector all the time. Drove
me bonkers. The new motor I eventually got also trips its thermal
protector, but not as often. The trip is just about always on startup.
The unloader appears to be operating correctly.
All of the motors are/were single phase induction motors with a great
big pair of caps on them. (run and start caps) In my research into the
original crappy motor from Ingersol Rand (reviews were insanely bad
including claims of bursting into flame) a couple people recommended
installing a soft start kit on the motor or any replacement motor.
Anybody have a soft start for dummies guide they can point me to that
might be appropriate for this application?
I also considered a reduced pulley size to reduce load on the motor, but
then the motor would run longer each time it cycled on. I don't know
what the balance of heat build up would be from longer run, verses less
load. Compressor duty motors are not intended to run continuously.
I also considered a 3 phase motor with a VFD and a soft start programmed
into the VFD, but 5HP 3 phase motors aren't cheap and neither are VFDs
big enough to drive them on single phase.
If this thing exploded tomorrow I'd be tempted to go back to the 3.7 HP
compressors I ran before, and just plan to repair them every couple years.
It sure sounds like the motor is a tad too small for the task. And/or
needs the pulley system to run the pump slower for a given motor
speed.
Joe Gwinn
The best I have to capture current spikes on a scope is a Hantek Hall effect >probe for DC and a Fluke current clamp for AC. They were fairly inexpensive >and good enough for hobby use such as measuring refrigerator starting >surges, to select a large enough inverter.
On Wed, 11 Oct 2023 13:10:53 -0400
"Jim Wilkins" <muratlanne@gmail.com> wrote:
<snip>
The best I have to capture current spikes on a scope is a Hantek Hall effect >>probe for DC and a Fluke current clamp for AC. They were fairly inexpensive >>and good enough for hobby use such as measuring refrigerator starting >>surges, to select a large enough inverter.
Thanks, good info?
Analog meters were still widely used when I started working. Switched
to a digital (bought my own) a few years in. The analog meter
spike/twitch was sorely missing. Maybe 10 years later I bought a Fluke
87 which had the bottom bar in the display that updated 4x? faster than
the digital display. Was quirky but helpful once you got used to it...
"Bob La Londe" wrote in message news:ug4hq7$1cjmf$1@dont-email.me...
In my shop I run a 5HP Ingersol Rand 2 stage compressor. The first
motor lasted just a little longer than the warranty, but until it let
the magic smoke out it started the compressor every single time.
--------------------------
Here is a better controlled alternative to a mechanical unloader. It might >reduce the starting surge enough to make the motor last much longer. >https://tameson.com/pages/compressor-unloader-valves
Their indirect valve operates like the water valves on a lawn sprinkler >system. It does the same thing as my manual cammed-open pressure relief >valve, lets the motor start without a load. A mechanical unloader releases >the air between the compressor head and the tank check valve when the >pressure sensing diaphragm in the control unit rises to shut off the motor, >but the head outlet pipe's volume is low and the unloader vent valve closes >when the diaphragm drops and pressure builds again on the first piston >upstroke. A timed unloader can vent the air until the motor reach full
speed.
I think you could add one in parallel with the mechanical unloader, the >compressor won't build pressure until both unloaders have stopped venting.
Today at the ham radio flea market I picked up and examined a 1-10 second >time delay relay of the type I had used in industrial relay logic
controllers in the 70's. The seller explained using it to time a solenoid >valve unloader on a compressor, which suggests he had seen it done. I was >just trying to remember if I already had one like it. I built a 240V >spotwelder timer with another one that I set to 0.2 seconds for 22 gauge >galvanized steel.
Anybody have a soft start for dummies guide they can point me to that
might be appropriate for this application?
In my shop I run a 5HP Ingersol Rand 2 stage compressor. The first
motor lasted just a little longer than the warranty, but until it let
the magic smoke out it started the compressor every single time. I had
an extended warranty so eventually when the service company got tired of lying to me and lying to the warranty company I eventually got a new
motor. Not the same motor (thank goodness), but also not the same frame
size motor.
(In the interim I ran a cheap motor I bought on-line.)
The interim motor would trip its thermal protector all the time. Drove
me bonkers. The new motor I eventually got also trips its thermal
protector, but not as often. The trip is just about always on startup.
The unloader appears to be operating correctly.
All of the motors are/were single phase induction motors with a great
big pair of caps on them. (run and start caps) In my research into the original crappy motor from Ingersol Rand (reviews were insanely bad
including claims of bursting into flame) a couple people recommended installing a soft start kit on the motor or any replacement motor.
Anybody have a soft start for dummies guide they can point me to that
might be appropriate for this application?
I also considered a reduced pulley size to reduce load on the motor, but
then the motor would run longer each time it cycled on. I don't know
what the balance of heat build up would be from longer run, verses less
load. Compressor duty motors are not intended to run continuously.
I also considered a 3 phase motor with a VFD and a soft start programmed
into the VFD, but 5HP 3 phase motors aren't cheap and neither are VFDs
big enough to drive them on single phase.
On Wed, 11 Oct 2023 14:02:43 -0400, Leon Fisk <lfi...@gmail.invalid>...
wrote:
On Wed, 11 Oct 2023 13:10:53 -0400
"Jim Wilkins" <murat...@gmail.com> wrote:
<snip>
The best I have to capture current spikes on a scope is a Hantek Hall effect
probe for DC and a Fluke current clamp for AC. They were fairly inexpensive
and good enough for hobby use such as measuring refrigerator starting >>surges, to select a large enough inverter.
My compressor motor was originally wired for 115 and it kicked out on start-up about hnalf the time when cold and about 10% of the time when
warm. I switched it over to 230 and it hasn't had a single issue
since. I even put a bigger pulley on it after converting to 230. My
original motor was a repulsion start monster(with brishes) but the
start switch went bad and parts were unobtanium so I switched to the cap-start
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