Difference between revisions of "Determining Argon hardware failure"
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The parts mentioned here on Argon and SMV2USB may be replaced by person capable of desoldering and soldering SMT components. | The parts mentioned here on Argon and SMV2USB may be replaced by person capable of desoldering and soldering SMT components. | ||
+ | ===Testing the failure=== | ||
+ | Typically D19 short circuits to GND when it has been damaged. To test whether this is the case, measure resistance with multimeter between GND and RS485_A / RS485_B pins of RJ45 connector. If resistance is low (less than 10 Ohms), the D19 is shorted and should be replaced. | ||
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===Replacing components to repair communication faulure=== | ===Replacing components to repair communication faulure=== | ||
[[File:Hot-Air-Soldering-Station-850.jpg|thumb|Typical hot air soldering station]] | [[File:Hot-Air-Soldering-Station-850.jpg|thumb|Typical hot air soldering station]] | ||
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If still no connection (after new D19, IC4 and SMV2USB), then failure might have propagated further making repair more challenging. Granite Devices may be still able to repair it cost efficiently. | If still no connection (after new D19, IC4 and SMV2USB), then failure might have propagated further making repair more challenging. Granite Devices may be still able to repair it cost efficiently. | ||
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+ | {{tip|As D19 is a protection device, drive works without it as well, so it is possible to repair the drive just by removing D19. However without the diode, rest of the electronics inside drive are vulnerable to the same error that caused D19 to burn. Operating without D19 will always terminate warranty.}} | ||
[[category:Argon troubleshooting]] | [[category:Argon troubleshooting]] |
Revision as of 14:54, 3 March 2016
If Argon (servo drive) refuses to operate in any meaningful way, it is good to perform few tests for the hardware to identify possible hardware failures.
Contents
Verifying AC to HV DC circuity
See Argon supply voltage troubleshooting
Testing power stage
Motor power stage and braking resistor output consists IGBT transistors that typically short circuit if they are damaged. Testing of such failure needs only a multimeter with resistance measurement function.
- Unplug all connectors from the drive at least 30 minutes before testing as residue voltages may disturb this test and pose a danger. After 30 minutes fully disconnected, ensure that voltage has been safely discharged.
- Measure resistance between J4 pin VN against BR,U,V and W. A typical resistance is between 100 kΩ - 10 MΩ. If resistance is less than 10 kΩ, there may be a failed IGBT.
- Measure resistance between J4 pin VP against BR,U,V and W. A typical resistance is between 100 kΩ - 10 MΩ. If resistance is less than 10 kΩ, there may be a failed IGBT.
SimpleMotion V2 port
SimpleMotion V2 port (J2 on argon) is protected by clamping diode (type NXP PESD5V0S4UD) that is identified as D19 in the adapter and Argon drive. That diode typically burns if 24VDC is miswired in the port or if faulty Ethernet/RJ45 cable is being used. Same diode exists also in the SimpleMotion V2 USB adapter and may be damaged as well. Sometimes fault propagates longer and kills also RS485 driver chip (Texas Instruments SN65176BDR) which is identified as IC4 on Argon and IC1 on SM V2 USB Adapter.Typical symptom of failure is inability to connect drive through SimpleMotion bus (i.e. Granity does not connect). Sometimes D19 short circuits 5V bus to ground making devices appear completely dead. To test if the device still has life, removing D19 (and possibly IC1 or IC4) can be used to verify whether lights come on when voltage is applied to the device.
The parts mentioned here on Argon and SMV2USB may be replaced by person capable of desoldering and soldering SMT components.
Testing the failure
Typically D19 short circuits to GND when it has been damaged. To test whether this is the case, measure resistance with multimeter between GND and RS485_A / RS485_B pins of RJ45 connector. If resistance is low (less than 10 Ohms), the D19 is shorted and should be replaced.
Replacing components to repair communication faulure
Replacing surface mount components like D19 or IC4 are most conviently done with hot air soldering station.
Typical repair procedure
- First eliminate the original wiring error to prevent same mistake again
- Remove D19
- Try drive communication (just 24V supplied and RJ45 wired straight to SMV2USB).
- If device works, solder a new D19 in place. Job done.
- If no luck, try with known-good or new SMV2USB as well.
- If still no connection is possible, replace also IC4, and try again.
If still no connection (after new D19, IC4 and SMV2USB), then failure might have propagated further making repair more challenging. Granite Devices may be still able to repair it cost efficiently.
As D19 is a protection device, drive works without it as well, so it is possible to repair the drive just by removing D19. However without the diode, rest of the electronics inside drive are vulnerable to the same error that caused D19 to burn. Operating without D19 will always terminate warranty. |