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5 operation with fi circuit breakers, 6 system bus – NORD Drivesystems BU0180 User Manual

Page 169

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9 Additional Information

BU 0180 GB-0914

Pre-series version

169

9.5 Operation with FI circuit breakers

With frequency inverters (except 115V devices), leakage currents of up to 16mA are to be expected if the
mains filter is active. These are designed for operation with leakage current circuit breakers for the
protection of persons.

For further details, please refer to Section 2.7.4.

9.6 System bus

Frequency inverters and 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 associated 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.

The connection of the individual NORD components is described in this manual (See section 2.8, 3.3 and 3.4).

NOTE: Communication on the system bus only starts if an extension module is connected to the bus or if in
a Master / Slave system, the Master is parameterised to P503=3 and the Slave is parameterised to P503=2.
This is especially important if several frequency inverters which are connected via the system bus are to be
read out in parallel with the NORDCON parameterisation software. In this case, identification of the devices
with NORDCON is not possible.

Physical structure

Standard

CAN

Bus length

20m with a wire cross section of 0.25mm² (AWG23)

Structure

preferably linear

Spur cables

possible, (max. 6m)

Termination resistors

120Ω, 250mW at both ends of a system bus

(with SK 1x0E-

… or SK xU4-… via DIP switches)

Baud rate

250kBaud - preset

SYSTEM BUS

Configuration Example

1. FI

2. FI

3. FI

4. FI

1. I/O

Extension

8. I/O

Extension

Field Bus

Option

additional participants
(I/O extensions, CANopen encoder

Note:
Terminal77 = System bus + (CAN H)
Terminal78 = System bus - (CAN L)
Terminal numbers may differ