Can Bus - Sirona TENEO Service Manual

3 Important information
3.2

CAN BUS

In the treatment center there are several CAN networks.
Thestandard CAN runs all of the control units for the treatment center, software updates and service support.
The S CAN runs only PC software functions for the user interface.
The motor CAN runs all commands for controlling the motorsM1 / M2 / M3 from theNSA board to the three DCFU boards.
After the treatment center is switched on, all components and software are queried and displayed in the set-up dialog. If the
connection fails during operation, the unit must be switched on again.
SET-UP key
If an installed component is missing here, this board and the CAN connection to the user interface (NAKboard) must be
checked.
Each node that loses its standard CAN connection to the central error memory in the NSA board flashes cyclically 2x at its
error LED. -> Check the CAN bus.
In each CAN network there are 2x 120-Ohm resistors, that, measured in parallel on the CAN line, result in 60 Ohms. If you
measure 120 Ohms on the CAN line with an Ohm meter (when the dental treatment unit is switched off), there is a disruption
in the line.
In the case of a disruption, measure the connections between the connectors.
For example:
+
Check CAN : NSA board, X1.5 to NAJboard X22.5:
0 - 3 Ohm = OK
00 Ohm = line disruption
240 Ohm = line disruption CAN+ but CAN- is OK
3 – 6
C
Clean Setup
> 2s
61 94 448 D 3509
D 3509.076.01.01.02 07.2008