NORD Drivesystems BU0200 - Manual (Page 291)

SK 200E Manual for frequency inverters
290 Subject to technical alterations BU 0200 GB-4411
9.6 Operation with FI circuit breakers
With SK 2xxE frequency inverters (except 115V devices), leakage currents of > 40mA are to be expected if
the mains filter is active. If possible, an FI circuit breaker for the protection of personnel should not be used.
If the frequency inverter is to be used with an FI circuit breaker for the protection of personnel, the leakage
currents to earth must be reduced to 10 - 20 mA by means of jumpers. However, with "operation on an IT
network" the FI loses its specified degree of interference protection.
Further details can be found in Section 2.7.5.
9.7 System bus
SK 2xxE series frequency inverters and components communicate with each other via the system bus. This
bus system is a CAN bus with a 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 bus does not require any BUS-specific knowledge on the part of the
user.
It is only necessary to take care that the correct physical structure of the bus system and the correct
addressing of the participants are complied with.
The connection of the individual NORD components is described in this manual
(See Section 2.8, 3.4 and 3.5).
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 2xxE- … 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