AXBB charge pump fault

[CharlieRam]

In the ucnc software I can configure which outputs to use for the charge pump so I was planning on setting it to the output 17 in the bob which is for the relay or forward reverse control but it isn't switching the relay which is why I think I need to power it from the ish rather than the on-board 5v connectors. I've included the pdf for the bob

I appreciate the help John
Edit.
I should probably add that the bob is connected to port 3 of the AXBB and not to the pc parallel port.
https://cloud.tapatalk.com/s/5d514e97...%20%281%29.pdf

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[john swift]

The BOB you have linked to does not have the charge pump / watchdog circuit needed



pin 17 just switches the relay on when the pin is taken high ( +5V )

one DIY circuit from Geckodrive.com



John

[CharlieRam]

The BOB you have linked to does not have the charge pump / watchdog circuit needed



pin 17 just switches the relay on when the pin is taken high ( +5V )

one DIY circuit from Geckodrive.com



John

Oh...my understanding was that the AXBB watched for the signal from the pc and then activates a chosen output for the charge pump. In my case it would be pin 17 controlled through the AXBB's 26pin idc to the bob which would then switch the onboard relay on to complete the circuit to power my safety relay for the drives.

Am I understanding it wrong? There should be no random outputs on the AXBBs port 3 lile would be on a pc's parallel port on start up or at least that's what I assumed.

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[john swift]

last night I expected the AXBB to work as you described but after downloading the manual

at the bottom of page 19
8.1.1 .Digital isolated ports.

Port#1 pins 2. to 8. are isolated outputs. These outputs contain high speed 10Mbit/sec
optocouplers and an N-channel Mosfet transistors.
The outputs can drive upto 500mAmps of current upto 24Volts voltage levels.
The high current capability of the output transistors makes these outputs ideal to drive
relays, solid state relays and other signals which require isolation.
19/29

on page 21
8.3 .Charge pump safety circuit port

There is one charge pump safety circuit integrated on the board in port#1 O1 CHP output.
The charge pump circuit senses the charge pump pulse stream signal from the controller and
if the signal exists then the output is switched on and if it cuts then the output switches off.
The charge pump can be used to control a safety relay to cut power when the software is not running on the computer.

Unless I have missed it
I have not seen an explicit ref to all output being switched off as I would of expected

My be another AXBB user can confirm

John

PS
have you contacted the manufactures ?

[CharlieRam]

last night I expected the AXBB to work as you described but after downloading the manual

at the bottom of page 19
8.1.1 .Digital isolated ports.

Port#1 pins 2. to 8. are isolated outputs. These outputs contain high speed 10Mbit/sec
optocouplers and an N-channel Mosfet transistors.
The outputs can drive upto 500mAmps of current upto 24Volts voltage levels.
The high current capability of the output transistors makes these outputs ideal to drive
relays, solid state relays and other signals which require isolation.
19/29

on page 21
8.3 .Charge pump safety circuit port

There is one charge pump safety circuit integrated on the board in port#1 O1 CHP output.
The charge pump circuit senses the charge pump pulse stream signal from the controller and
if the signal exists then the output is switched on and if it cuts then the output switches off.
The charge pump can be used to control a safety relay to cut power when the software is not running on the computer.

Unless I have missed it
I have not seen an explicit ref to all output being switched off as I would of expected

My be another AXBB user can confirm

John

PS
have you contacted the manufactures ?

I think I will have to, I just wanted to check I hadn't missed anything. It was working fine and I'm not sure when it turned faulty but noticed a few days ago that it started straight away it seems strange that the software will allow me to choose any output for the charge pump though.
Cheers for the help

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