[GM81]

With the recent temp here in Southern California we have been having issues with our old VMC. If I don't keep the side cabinet door open the machine alarms out every 15-20 minutes. Has anyone added fans to the side panel? I hate running with the door open.

Thanks for reading.

[LSM]

I have the same problem, not a big surprise.
the cure ac, box fan blowing on the cabinet might work

[carbidecraters]

Good lord do not leave your cabinet open. The PCB boards need dry clean air. Fadals shipped form the factory with fans (1989 and newer) and dessicant bags to make sure the components do not suffer humidity issues. These boards are surface mounted and not coated over for repair purposes. They soccumb to moisture quite often if left to it. If you have a fan in the bottom of the cabinet take the filter out and clean it.

[jon_fallon]

Which cabinet is it - the one with the inverter? On the 6030 here, the inverter cabinet fan located at the bottom was installed incorrectly. It was blowing air into the cabinet with insufficient head to exhaust air through the upper vent. All it was doing was stirring up hot air, and three capacitors on the inverter finally blew out one hot day. The fan should be installed to pull air from within the cabinet and blow it downward, with makeup air being supplied by the upper panel vent. The filters can also get clogged as well which will reduce the flow of cooling air.

[neilw20]

When pulling air from a cabinet, every little nook and cranny needs to be sealed as dust, dirt and moisture will get sucked in as cabinet pressure is below ambient.
Cabinets are normally at higher pressure to keep out the the contaminants.
If air flow is bad, fix the airflow, but do suck it in through a nice filter system, with the outlet flow from the fan blowing on the hottest parts.
The fancy good sealed cabinets have a refrigeration reverse cycle aircon in the back (or somewhere) to exchange the heat, and no outside air goes in or out.
This also allows the machine to run in very low temperature environments without the risk of condensation on electronic assemblies.

[jon_fallon]

On the 4020 & 6030 here, the card cabinet (on right side looking from the front) is sealed with the 4020 having a close loop cooling system that is temperature activated. The inverter cabinet (on the left side looking from the front) is also sealed, but with inlet and outlet ports. The air must be pulled through this cabinet as there is insufficient fan head to move any air through the outlet port. This can be verified by installing the fan in both directions, letting the machine run for an hour, and then opening the cabinet door to check the temperature. Whoever installed the fan backward in the 6030 cost me 1800 bucs for a rebuilt inverter.