spindle encoder question gmoccapy/Orac/7i96 ***Solved***

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20 Jun 2021 13:25 #212483 by Boris
Hello all,

Hoping someone may be able to point in the right direction having come to a bit of a halt with the spindle encoder on a Denford Orac conversion I'm very slowly working through.

I have managed to get GMOCCAPY running with a 7i96 and have got the X & Z axes moving with it. I also have a VFD fitted that but I am controlling the spindle with the VFD panel for the moment.

The next stage is to install an encoder and once the software is displaying the correct spindle RPM I will set the VFD to be controlled from the 7i96 with a PWM board.

The problem I'm having is that I cannot get an RPM indication on the screen. The Encoder is an OMROM E6B2-CWZ6C and is wired to the board as follows;

TB2 pin 7 ENCA = OUTA
TB2 pin 9 GND = 0V (common)
TB2 pin 10 ENCB = OUTB
TB2 pin 12 +5V = 5to24VDC
TB2 pin 13 IDX+ = OUTZ

I've updated the firmware ready to use PWM to control the spindle VFD the same way Rotary SMP did on his minilathe project. The configuration I pulled from the terminal is below;

cnclathe@CNCLathe:~$ mesaflash --device 7i96 --addr 10.10.10.10 --readhmid
Configuration Name: HOSTMOT2

General configuration information:

BoardName : MESA7I96
FPGA Size: 9 KGates
FPGA Pins: 144
Number of IO Ports: 3
Width of one I/O port: 17
Clock Low frequency: 100.0000 MHz
Clock High frequency: 200.0000 MHz
IDROM Type: 3
Instance Stride 0: 4
Instance Stride 1: 64
Register Stride 0: 256
Register Stride 1: 256

Modules in configuration:

Module: DPLL
There are 1 of DPLL in configuration
Version: 0
Registers: 7
BaseAddress: 7000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: WatchDog
There are 1 of WatchDog in configuration
Version: 0
Registers: 3
BaseAddress: 0C00
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: IOPort
There are 3 of IOPort in configuration
Version: 0
Registers: 5
BaseAddress: 1000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: PWM
There are 1 of PWM in configuration
Version: 0
Registers: 5
BaseAddress: 4100
ClockFrequency: 200.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: StepGen
There are 4 of StepGen in configuration
Version: 2
Registers: 10
BaseAddress: 2000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: QCount
There are 1 of QCount in configuration
Version: 2
Registers: 5
BaseAddress: 3000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: SSerial
There are 1 of SSerial in configuration
Version: 0
Registers: 6
BaseAddress: 5B00
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 64 bytes

Module: SSR
There are 1 of SSR in configuration
Version: 0
Registers: 2
BaseAddress: 7D00
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: LED
There are 1 of LED in configuration
Version: 0
Registers: 1
BaseAddress: 0200
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Configuration pin-out:

IO Connections for TB3
Pin# I/O Pri. func Sec. func Chan Pin func Pin Dir

1 0 IOPort None
14 1 IOPort None
2 2 IOPort None
15 3 IOPort None
3 4 IOPort None
16 5 IOPort None
4 6 IOPort None
17 7 IOPort None
5 8 IOPort None
6 9 IOPort None
7 10 IOPort None
8 11 IOPort SSR 0 Out-00 (Out)
9 12 IOPort SSR 0 Out-01 (Out)
10 13 IOPort SSR 0 Out-02 (Out)
11 14 IOPort SSR 0 Out-03 (Out)
12 15 IOPort SSR 0 Out-04 (Out)
13 16 IOPort SSR 0 Out-05 (Out)

IO Connections for TB1/TB2
Pin# I/O Pri. func Sec. func Chan Pin func Pin Dir

1 17 IOPort StepGen 0 Step/Table1 (Out)
14 18 IOPort StepGen 0 Dir/Table2 (Out)
2 19 IOPort StepGen 1 Step/Table1 (Out)
15 20 IOPort StepGen 1 Dir/Table2 (Out)
3 21 IOPort StepGen 2 Step/Table1 (Out)
16 22 IOPort StepGen 2 Dir/Table2 (Out)
4 23 IOPort StepGen 3 Step/Table1 (Out)
17 24 IOPort StepGen 3 Dir/Table2 (Out)
5 25 IOPort PWM 0 PWM (Out)
6 26 IOPort PWM 0 Dir (Out)
7 27 IOPort QCount 0 Quad-A (In)
8 28 IOPort QCount 0 Quad-B (In)
9 29 IOPort QCount 0 Quad-IDX (In)
10 30 IOPort SSerial 0 RXData0 (In)
11 31 IOPort SSerial 0 TXData0 (Out)
12 32 IOPort SSerial 0 TXEn0 (Out)
13 33 IOPort SSR 0 AC Ref (Out)

IO Connections for P1
Pin# I/O Pri. func Sec. func Chan Pin func Pin Dir

1 34 IOPort None
14 35 IOPort None
2 36 IOPort None
15 37 IOPort None
3 38 IOPort None
16 39 IOPort None
4 40 IOPort None
17 41 IOPort None
5 42 IOPort None
6 43 IOPort None
7 44 IOPort None
8 45 IOPort None
9 46 IOPort None
10 47 IOPort None
11 48 IOPort None
12 49 IOPort None
13 50 IOPort None

cnclathe@CNCLathe:~$


Can anyone see any obvious error with my wiring or configuration? I am at a loss. For info, the encoder is getting power and appears to be sending back a variable voltage the mesacard. I haven't attempted to edit the INI or HAL files yet as that will be another learning curve. Cheers

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20 Jun 2021 14:22 #212487 by PCW
Do you have the 7I96 encoder inputs jumpered for single ended (TTL) mode?

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20 Jun 2021 14:38 #212488 by Boris
Thanks for looking.

Yep, W2, W3 & W4 are all in the TTL position. I'm pretty sure I tried the other position just in case but no dice.

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20 Jun 2021 15:03 #212489 by PCW
Did you check the encoder position and velocity with halshow?

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20 Jun 2021 15:26 #212491 by Boris
I haven't as I have absolutely no idea how to do that (apologies and I appreciate everyone's patience - I'd never used linux before starting this project). Are there any useful references/guides to follow so I can check the position and velocity with halshow?

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20 Jun 2021 15:32 #212492 by PCW
Not sure how you launch halshow in GMOCCAPY but you cal always launch it by typing

halshow

in a terminal window when linuxcnc is running

You can now select the "Watch" pane and select/view the desired pins
parameters etc in real time

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20 Jun 2021 15:33 #212493 by Boris
Ok great. I'll go do some reading and give it a go.

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20 Jun 2021 15:57 #212495 by Boris
Hi PCW

found it - thank you. So in halshow the encoder shows a sensible looking RPM and counter and worked in both directions. It just doesn't show on the gmoccapy screen.

Could that be a problem ini setting or hal setting?

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20 Jun 2021 16:59 #212500 by Boris
Ok it's not looking like a hardware issue. I've just redone the Pncconf wizard and included the PyVCP GUI which has a spindle RPM scale. When I set the spindle running in that the small GUI window displays the rpm but the main gmoccapy window does not show any rpm.

Has anyone come across this before? I appreciate all of your time. Cheers.

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20 Jun 2021 21:03 #212514 by PCW
Its' likely that GMOCCAPY's RPM display pin is not connected

I have no idea what this is called but

halcmd show pin

will show all pins

and

halcmd show pin | grep -e spindle -e speed -e rpm

may narrow it down (but might miss it)

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