Nord Drivesystems SK 180E Series, User Manual

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8 Additional information
BU 0180 en-4118 191
8.6 System bus
The device and many of the associated components communicate with each other via the system bus.
This bus system is a CAN bus with CANopen protocol. Up to four frequency inverters and their
components (field bus module, absolute encoder, I/O modules etc.) can be connected to the system
bus. Integration of the components into the system bus does not require any specific knowledge of the
bus on the part of the user.
Only the proper physical configuration of the bus system and if necessary the correct addressing of
the participants need to be taken into account by the user.
No. Type Terminal Meaning
1 Mains connection 77 System bus+ (CAN_H)
2 System bus cable (CAN_H, CAN_L, GND) 78 System bus- (CAN_L)
3
Frequency inverters
40
GND (Reference potential)
4 Options
•
Bus modules
• IO Extensions
• CANopen rotary encoder
Terminal numbers may differ (depending on the device)
Information
Communication interference
To minimise the risk of communication interference, the GND –potentials (Terminal 40) of all GNDs which are
linked via the system bus GND must be connected together . The shield of the bus cable must also be
connected to PE at both ends.
Information
Communication on the system bus
Communication on the system bus does not take place until an expansion module is connected to it or if the
master in a master/slave system is parameterised to P503 =3 and the slave to P503 =2. This is particularly
important if several frequency inverters connected to the system bus in parallel are to be read out using the
NORDCON parameterisation software.