115 lines
4.3 KiB
Markdown
115 lines
4.3 KiB
Markdown
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Note: This is copied from a 2018 EEVBlog post by Luiz Renault for posterity.
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https://www.eevblog.com/forum/manufacture/neoden-tm245p-teardown-and-upgrade/
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# post
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Hi.
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Tired of the painful process to setup the Neoden TM245P Pick and Place, I decided to make a mod to OpenPNP to export a CSV file compatible with the Neoden machine.
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This way I can reuse component database and check if required components are present or need to be installed on free feeders.
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But that isn't enough. I really want to install a vision system and make it compatible with OpenPNP to control the machine.
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Today I opened the bottom plate and collected some information to check if the upgrade is possible using the original electronics.
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Here I share my findings...
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The guts of the TM245P consists of:
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a motherboard (model TY164) with TFT LCD and resistive touch
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a power supply and control board (model TY131)
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two microstep driver
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two vacuum pumps
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one air blower
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a transformer
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The motherboard have a STM32F407ZGT6 and a RA8875L3N TFT LCD Controller. The SD card slot can be seen on the left side of the board.
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At the center there is a 26 pin IDC connector that goes to the power supply and control board.
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On the top a 3 pin SWD connector and on the right side a 2 pin connector that powers the vibration feeder can be seen.
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The board uses as power supply 24V that comes from the power supply and control board. There is a 5V step down regulator (LM2576S-5.0) that supplies the uC through a 3.3V Linear reg.
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The 5V rail are sent back to the power supply and control board.
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This is the microstep driver:
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The power supply and control board have 4 diode bridge rectifiers (GBU808 on bottom layer) with +100V, +30V, +12V and -12V labels.
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There are four step down regulators (LM2576T-ADJ): +30V->+24V, +30V->+24V, +12V->+9V e -12V->-9V
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And the following connectors:
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P1 -> Transformer (label 220V)
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P2 -> air blower (connected to AC input)
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P3 -> Transformer (label 110V)
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P4 -> AC input and on/off switch
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P5 -> Transformer taps labeled 70V, 23V, 11V, 11V
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P6 -> To motherboard
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P7 -> Power Supply to step controller X axis (connected to 100V labeled line)
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P8 -> Power Supply to step controller Y axis (connected to 100V labeled line)
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P9 -> X axis step controller signals (EN, DIR, STEP)
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P10 -> Y axis step controller signals (EN, DIR, STEP)
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P11 -> To DB9 connector at the back of the equipment (CAN-H CAN-L JTMS e JTCK
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P12 -> Endstop Y axis switch
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P13 -> Pick and place head
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P14 -> Vacuum Pump A
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P15 -> Vacuum Pump B
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P16 -> Endstop / origin Y axis switch
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P17 -> Feeder block 1
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P18 -> Feeder block 2
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The feeders and the head are controlled through a CAN bus connection. The same bus goes to the back DB9 connector.
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This is the 26 pin connector pinout from the motherboard:
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I tried to read the firmware but the uC have Level 1 Read Protection.
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The next step is to log the CAN communication while sending simple commands using the equipment GUI.
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Then I will check if the X and Y axis can be controlled through CAN messages.
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Does anybody have the CAN message specification?
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Anybody tried to mod this machine?
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Best Regards,
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Luiz Renault
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-------------------------------------------
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Hi today I placed a scope on the CAN_H and CAN_L signals on the DB9 back connector.
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But they are too noisy to be useful and I had open the Pick and Place head and monitor on the inner (uC) side of the CAN transceiver (SN65HVD230).
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I assumed a bit rate 512 kbit/s because the smallest pulse length.
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But the oscilloscope wasn't able to decode it. The problem is that the CAN bit stuffing is not present.
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Does anyone have any clue?
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-------------------------------------------
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Although it uses a CAN transceiver, I could see on the Placement Head board that the CAN_TX and CAN_RX signals were connected to the USART signals of the STM32F103C8 (PA9 and PA10).
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Then I was able to decode de USART 512kbit/s signal. It uses a binary format.
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