PDMX 126 with AM822 drivers and relays.

[dachopper]

I read in the PDMX manual, if the charge pump signal is disabled, then it will disable the PMDX-126 and all motor drivers. If the drivers are disabled, then they cannot be in fault mode right?

The UCCNC software, can be set to de-activate the charge pump signal, whenever the software is in reset - ( which occurs when passed an E-stop or Fault signal for example )

So in summary Am882 Drivers detect fault. PDMX detects the 882 fault signal and passes to UCCNC. UCCNC goes into reset, which disables charge pump. PDMX now disabled ( powered down ) as charge pump off.

Click on UCCNC reset button now powers up PDMX, which powers up motors ( fault signal effectively reset ), Continue job.

Am I missing something regarding the fault loop? or does this sound like it will work?

Attached, schematic of rough config
Attachment 21408

[Clive S]

Attached, schematic of rough config
Attachment 21408

This is showing an invalid attachment at my end.

[dachopper]

try again

[JAZZCNC]

I read in the PDMX manual, if the charge pump signal is disabled, then it will disable the PMDX-126 and all motor drivers. If the drivers are disabled, then they cannot be in fault mode, right?


Am I missing something regarding the fault loop? or does this sound like it will work?

Yes, you are missing the fact the Drives will still be OUTPUT a fault signal unless the fault is cleared inside the drives. The PMDX only disables its OWN OUTPUTS it cannot control the Drives OUTPUTS and because you're watching these OUTPUTS with the PMDX INPUTS then the fault signal going to the PMDX will Never be cleared.

Also, think your misunderstanding the Charge Pump. The function of the Charge pump is to disable the PMDX outputs if the connection to the PC is lost. Shouldn't be used for E-stop or to control drives etc.

The drives could be reset using the Enable signal but not a good solution IMO because it's relying on software.

[dachopper]

I see, I just read this from 882 manual "Reset the drive by repowering it to make it function properly after removing above problems" so, if I have one of the pdmx relays controlling the driver voltage, so it cuts driver voltage on fault, this should accomplish the job, or I can manually cycle 882 drive power to clear ?

If I'm using the relay, should it be cutting power on the DC side, or AC side of my power supply?

Nick.

[m_c]

I see, I just read this from 882 manual "Reset the drive by repowering it to make it function properly after removing above problems" so, if I have one of the pdmx relays controlling the driver voltage, so it cuts driver voltage on fault, this should accomplish the job, or I can manually cycle 882 drive power to clear ?

If I'm using the relay, should it be cutting power on the DC side, or AC side of my power supply?

Nick.

Always cut the ac side. Cutting the dc side risks blowing up the drives.

[dachopper]

OK - I'm goint to try knock up a more complete schematic, and see what you think

[dachopper]

again#2

[JAZZCNC]

Don't like this setup because you don't have latching safety circuit. How you have it now soon as you release the E-stop the system becomes active again regardless if the fault is cleared or not.

Personally, I would run the E-Stop thru Master relay wired so forms latch. This then controls the Killing of power to high powered devices like Drives, Vfd etc. Then informs PMDX E-stop occurred which then does the Rest and turns off its Outputs. The Master Relay can only be Reset by pressing Momentary Button and will only allow the Relay to reset if all faults are clear.
The E-stop circuit can then be run using 24V giving better noise immunity.