CAN-Bus wiring check list
Description
Unicontrol 3/4 |
|
C- = BK = 0V (Can) |
Pin contacts for the D-Sub connector (viewed from the front) 9. + 24 V |
Can-bus transmission quality indicator
LED A: Transmission quality indicator (LED)
LED B: Transmission quality indicator CANopen (used only for the CANopen Gateway node)
The node (I/O box, I/O unit) indicates the quality of the CAN bus signal transmission
LED is green = good signal transmission
LED is red = signal transmission is faulty
If a CAN bus signal is not correctly transmitted, the LED of each node lights up red 1 second.
This indicates that an error has occurred during the signal transmission. However, the source of the error cannot be determined.
CAN bus diagnostics
G → Error frames (since starting the Machine)
H → Error frames (last minute)
Each of the Can-Bus ends must have a 120 Ohm terminating resistor .
If one side of the repeater is completely open and does not have either a connection to a node or terminating resistor, the can bus will not run successfully.
Repeater +190-A1
X22.1 welder
X22.2 to powder |
If there is also a "Can Open" bus in the machine, please check it in the same way.
Measurements
With Power Off
Please check the following on both sides of your repeater:
| Can H – 0V | → | Ohm meter | > 10 kΩ |
| Can L – 0V | → | Ohm meter | > 10 kΩ |
| Can H – Can L | → | Ohm meter | 60 Ω +/- 2 Ω |
| 0V - Ground | → | Ohm meter | < 2 Ω |
Check all connections (screws) and end resistors of the can bus if you measure more than 62 Ohms
Protocol “with power off”
Please fill out the complete test protocol and submit it to Soudronic.
| CAN H- 0V [Ω] | CAN L - 0V [Ω] | CAN H - CAN L [Ω] | 0V - Ground [Ω] | Test points ? | |
| Welder | |||||
| Oven / Powder | |||||
| SWM-2/3 Monitor +800 | |||||
| Can Open Gateway (if present) |
With Power on
Please check the following on both sides of your repeater:
| Can H – 0V | → | 2,3 - 2,7 Volt |
| Can L – 0V | → | 2,3 - 2,7 Volt |
| 24V – 0V | → | 24 Volt |
Protocol "with power on"
Please fill out the complete test protocol and submit it to Soudronic.
| CAN H - 0V [V] | CAN L - 0V [V] | 24V - 0V [V] | Test points ? | |
| Welder | ||||
| Oven / Powder | ||||
| SWM-2/3 Monitor +800 | ||||
| Can Open Gateway (if present) |
Tighten all screws on all plugs
- Tighten all screws on the CAN bus plugs and check if the connectors are fully pushed in (red arrows)
- Tighten all screws on the Power supply plugs and check if the connectors are fully pushed in (blue arrows)