Intec MLC 8000 Operating Manual page 86

INTEC GmbH
Lift controller MLC 8000
22/12/2016
Operating manual V2.0
time, the GND of power supply 0(24V) must be connected to PE at a single point (also in
the control cabinet).
3. Check that the two CAN bus lines CX+ and CX- are not reversed at any point and the bus
cable is properly clamped.
4. Then switch on power supply again and check the communication in the hardware test
menu.
5. If the CAN bus is still totally disturbed, then step by step, all bus modules should be
separated from the CAN bus and tested by menu item "Hardware test" whether the other
modules can communicate with each other. So it can be determined which of the modules
may be defect.
If individual components are separated from the CAN bus, then it should always be
taken into consideration that both cable ends are terminated with a 120Ω resistor
(activated by jumper at the last module on each end of the CAN bus). However, the
CAN bus works for testing purposes even if there is only a termination resistor at one
end of the CAN bus activated, but it should be completed in normal operation always
at both sides.
Are both ends of the cable open (no terminating resistor), then the CAN-Bus does not
work!
It should be noted that the CAN bus data transfer may also be disturbed by external
influences (shielded motor cables, missing suppressors on contactors, relays, brake
magnets, and so on). These factors must be included within the troubleshooting.
For interference suppression (EMC) it is particularly important that coils (e.g. relays,
brake, contactors) have a corresponding suppressor capacitor or similar. So the coil of
the mechanical motor brake at roped lifts should necessarily be suppressed with a
varistor. It should be noted that the suppressor is located as close as possible to the
coil.
Node ID:
Each module, which is connected to the CAN bus, has its own node ID number. At each of
the two CAN buses (control bus, shaft bus) each number must be unique, otherwise there
will be disturbances in the data transmission, which are difficult to diagnose.
Since TSE and ESE modules are used at different CAN busses (control bus, shaft bus), it is
allowed that a TSE as well as an ESE have the same node ID number.
The following error messages may be displayed when a node number is assigned twice:
- "CAN faulty xxx" (Module xxx has trouble sending / receiving data on the CAN bus)
- "CAN bus off xxx" (Module xxx turns because of frequent disturbances temporarily from the
CAN bus.)
- "No connect. xxx" (No CAN bus connection to the module xxx)
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