Nord Drivesystems NORDAC LINK SK250E-FDS, Руководство пользователя

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8 Additional information
BU 0250 en-3021 193
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8.5 Operation on the FI circuit breaker
For devices with an active mains filter (standard configuration for TN- / TT networks) leakage currents
of
≤
16 mA are to be expected. These are designed for operation with leakage current circuit breakers
for the protection of persons.
For devices with an inactive mains filter (special configuration for TN networks) leakage currents
of
≤
30 mA are to be expected. These are not suitable for operation with leakage current circuit
breakers for the protection of persons.
Only all-current sensitive FI circuit breakers (type B or B+) must be used.
(

Section 2.3.2.1 "Mains connection")
(

See also document TI 800_000000003 .)
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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.
Information
Communication interference
To minimise the risk of communication interference, the GND –potentials 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
NORD CON parameterisation software.
Physical structure
Standard
CAN
Physical design
2x2, twisted pair, shielded, stranded wires, wire cross-
section ≥0.25
mm² (AWG23),
surge impedance approx. 120
Ω
Bus length
max. 20 m total expansion (network),
max. 20 m between 2 subscribers,
Structure
preferably linear
Spur cables
possible, (max. 6 m)
Termination resistors
120
Ω
, 250 mW at both ends of a system bus
Baud rate
250 kBaud - pre-set
The CAN_H and CAN_L signals must be connected using a
twisted pair of wires. The GND potentials are connected using
the second pair of wires.