Search found 23 matches

by AngeloGomes
Wed Jan 22, 2020 2:44 pm
Forum: Vacuum Technology (& FAQs)
Topic: TC Gauge: AC/DC heater
Replies: 2
Views: 755

TC Gauge: AC/DC heater

I was wondering if a TC gauge, which was designed to use an AC heater, can be operated by using a DC heater instead. I have several DV-3M gauges but the meter I have is designed for a DV-6. The problem is the meter electronics supplies at most 90mA while the DV3 requires 120mA and the induced voltag...
by AngeloGomes
Mon Jan 06, 2020 1:39 pm
Forum: Vacuum Technology (& FAQs)
Topic: Edwards Active Gauge Controller Teardown
Replies: 7
Views: 1003

Re: Edwards Active Gauge Controller Teardown

My AGC does not have the Serial COMMS option. As I found a RS232 CI on the board, I was wondering if the connector is the only part missing for this option.
by AngeloGomes
Mon Jan 06, 2020 1:36 pm
Forum: Vacuum Technology (& FAQs)
Topic: Edwards Active Gauge Controller Teardown
Replies: 7
Views: 1003

Re: Edwards Active Gauge Controller Teardown

As you can see at right, just behind the RJ45 connectors (where the gauges are to be connected) there are a lot of varistors, they are 5 for each port. At top left the power wires and behind them the flat cable for the display board. This controller uses the voltage between pins 4 and 5 of the RJ45 ...
by AngeloGomes
Mon Dec 30, 2019 1:19 am
Forum: Vacuum Technology (& FAQs)
Topic: First ever Turbo experience
Replies: 38
Views: 7138

Re: First ever Turbo experience

Here, we usually have the heater attached to the chamber, but not at the pump body. About the venting... you have to wait for the turbo slow down the rotation and then admit air/gas in small amount. If I am not wrong, my pfeiffer performs the first vent operation at 1/3 of the max rotation and then ...
by AngeloGomes
Thu Dec 26, 2019 6:26 pm
Forum: Vacuum Technology (& FAQs)
Topic: Edwards Active Gauge Controller Teardown
Replies: 7
Views: 1003

Re: Edwards Active Gauge Controller Teardown

Below is the power Board. There are three stages here: one for 5V, 15V and 24V. the voltages go to the mainboard through soldered wires, the white ones at left. Here in Brazil, we call this as "dirty economy". A power connector at the mainboard should be right choice ! https://i.ibb.co/R0C1htK/POWER...
by AngeloGomes
Thu Dec 26, 2019 3:52 pm
Forum: Vacuum Technology (& FAQs)
Topic: Edwards Active Gauge Controller Teardown
Replies: 7
Views: 1003

Re: Edwards Active Gauge Controller Teardown

As none of membrane keys are working, I suppose the VCC line is broken somewhere. The plastic flat cable is not so easy to fix and after digging inside the display I messed up a bit, but I realize it is better to replace every membrane key separetely. As soon as individual membrane keys arrive from ...
by AngeloGomes
Thu Dec 26, 2019 3:44 pm
Forum: Vacuum Technology (& FAQs)
Topic: Edwards Active Gauge Controller Teardown
Replies: 7
Views: 1003

Re: Edwards Active Gauge Controller Teardown

The AGC has tree boards: 1) Power board 2) Display board 3) Mainboard The display board is shown below: https://i.ibb.co/NpV6GkF/displayboard.png The conector pin (PL9) is where the keyboard flat cable is attached. After some time playing around with these pins I found: Pin 1 = Up Key Pin 2 = Down K...
by AngeloGomes
Thu Dec 26, 2019 2:39 pm
Forum: Vacuum Technology (& FAQs)
Topic: Edwards Active Gauge Controller Teardown
Replies: 7
Views: 1003

Re: Edwards Active Gauge Controller Teardown

Well, this is a long story already posted here, and the original topic was lost with the forum last week. Below is how my AGC looks right now. Sometime ago, the membrane keyboard died, all keys. I´ve sent to Edwards representative who said the cheapest option I have was to forget the membrane keys a...
by AngeloGomes
Thu Dec 26, 2019 2:31 pm
Forum: Vacuum Technology (& FAQs)
Topic: Edwards Active Gauge Controller Teardown
Replies: 7
Views: 1003

Edwards Active Gauge Controller Teardown

The guy :

Image
The image/picture above is from someone else, mine is not in good shape as you will see below.


the symptom: No gauge is detected anymore and display shows ???ID