GX CS4-I compressor P/S fan

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Tango Sierra said:
Nope. Doesn't run with 12V connected. I tried that last evening. The power supply is bypassed when running on 12V.
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If it were mine, I would replace the fan myself. Pretty sure it is going to overheat that power supply without it running. Simple job I would guess. Might just be a bad connection. The fan probably has a part number on it to find a replacement. Waiting to get a replacement from China is beyond my patience level. I tried for 8 months getting a part from Tuxing / Aliexpress and finally gave up.
 
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I think I got it figured out. Fan works as designed. The fan worked when I plugged it directly into 12V on the bench. The fan is temperature controlled. Pencil is pointing to a 55°C NO thermal switch that's within a small heatsink on the switching supply FETs. The switch closes at its setpoint and enables the fan. I confirmed with a heat gun that the switch does indeed work and powered up the fan. Nice.
There is a 2nd thermal switch on the FETs that controls the inverter supply. It's an 80°C switch. Looks like it would disable the supply if it gets too hot. Also nice feature.
I could/might hardwire the fan to 12V on the pcb but it will run continuously when the unit is either plugged into the 120Vac wall plug or 12V battery input, regardless of the power switch position. It seems odd to me that the inverter is continuously powered up even with the front red switch OFF. What I'd recommend is either plugging the unit into a power strip or unplug it when you're not using it. That might be a good reason to hardwire the fan to 12V. That way I would never leave it plugged in.
PA please send me my Avenge-X soon so I can use this new compressor! 🤪

20230903_140537.jpg
 
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Geezerhood said:
Nice diagnosis. I am curious why they might have that fan disabled other than to save on power use when it isn't needed like when running of a 12v battery. The CS3 version definitely does not have that feature.
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Looks like the power supply is a standalone module and doesn't feed the fan control circuit outside of the module. The thermal switch was added- pcb trace cut and soldered the switch wires into the ground side of the fan supply.
There are 2 fans in this unit. The power supply fan is a baby compared to the one used for the radiator cooler. This bigger fan is controlled by the power switch. One could wire in the power supply fan into the radiator fan. It's 12V too.
One correction. The temp sensing switches are mounted to the power supply catch diodes, not the FETs. The switching FETs are heatsunk, but have no temp sensing.
 
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A follow-up. I went ahead and hardwired the small power supply fan to run anytime the compressor is plugged into the wall. Works as expected. I then plugged into my F-150 battery and found that the power supply fan did not run and the compressor also worked as expected. So I don't see any downside to hardwiring the power supply fan to 12V within the power supply. I noticed a large blocking diode in the cable harness that isolates the 12V inputs. Nice.
 
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I have one of these CS4-i compressors. It has probably less than an hour of run time on it and works great when it runs.
Mine shuts down during the cool down after I've charged my Avenge-X. I think my power supply cooling fan isn't working at all. I opened the case to look around after the compressor went dark and after fiddling around checking connections and finding no issues, it came back to life. I charged the gun again and felt the power supply getting warmer and warmer but the fan never kicked on.
I messaged the seller on Ali, we'll see if I get a response.
 
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The fan in the CS4-I power supply is temperature controlled. It takes several minutes for it to warm up enough (55C switch-on temp) to kick on the fan. Filling an Avenge-X won't typically run it long enough to kick it on - I have one. I did bypass the temp sensor so mine runs whenever the unit is powered on, as some insurance, but believe the existing p/S fan temp control does work. I've got several hrs now on mine and it's doing great. Pumps the Avenge-X and Notos up in no time.
 
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Mmmm, I have the GX CS4-I with the integrated power supply.
And as soon as I turn the power switch on ON (without any pumping going on) the fan is running.
So far, the thing seems to work great.

However, after bleeding it with the compressors bleed screw, there seems to be a lot of moisture left in the hose to my tank. Shouldn't that moisture be in the filter somewhere in the innarts of the pump...? 🤔

Matthias
 
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JungleShooter said:
Mmmm, I have the GX CS4-I with the integrated power supply.
And as soon as I turn the power switch on ON (without any pumping going on) the fan is running.
So far, the thing seems to work great.

However, after bleeding it with the compressors bleed screw, there seems to be a lot of moisture left in the hose to my tank. Shouldn't that moisture be in the filter somewhere in the innarts of the pump...? 🤔

Matthias
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Where did you purchase that model?
 
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JungleShooter said:
Mmmm, I have the GX CS4-I with the integrated power supply.
And as soon as I turn the power switch on ON (without any pumping going on) the fan is running.
So far, the thing seems to work great.

However, after bleeding it with the compressors bleed screw, there seems to be a lot of moisture left in the hose to my tank. Shouldn't that moisture be in the filter somewhere in the innarts of the pump...? 🤔

Matthias
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Does the i model appear to be the exact same compressor as the cs-4 model except for the built in power supply?
 
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Purchased from a local dealer (in Peru), who bought a shipment from China.

Unfortunately, I cannot say if there are more differences besides the internal vs. external power supply.
Judging from my recent discovery 😮 that airgun manufacturers silently change a part "in the next run" and even pellet/slug manufacturers change design (often without informing their customers) — I would say, yes, the two CS4 models are different in other aspects as well.

Matthias
 
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