Lenze EMF2178IB Uživatelský manuál stáhnout pdf (Strana 62)

6 Electrical installation

Wiring of system bus (CAN)

EDKMF2178IB DE/EN/FR 6.0

h2_can−Bus−Leitungslaenge_2178

Checking the use of repeaters

Compare the values derived from Tab. 1 Total cable length (^ 60) and Tab. 2 Segment

cable length (^ 61).

ƒ If the sum of the segment cable lengths is smaller than the total cable length to be

implemented, either repeaters must be used or the cable cross−section must be

increased.

ƒ If the use of repeaters reduces the max. possible total cable length so much that it is

smaller than the total cable length to be implemented, then the cable cross−section

must be increased or less repeaters must be used or the baud rate must be

decreased.

ƒ The use of a further repeater is recommended as ...

– service interface

Advantage: Trouble−free connection during bus operation is possible.

– calibration interface

Advantage: The calibration/programming unit remains electrically isolated.

Example

Given

Total cable length to be implemented 450 m

Number of nodes 32

Cable cross−section 0.50 mm

(AWG 20)

Baud rate 125 kbps

Repeater used Lenze repeater EMF2176IB

Reduction of the max. total cable

length per repeater (EMF2176IB)

30 m

Results

Max. total cable length 630 m

(see Tab. 1 Total cable length (^ 60))

Max. segment cable length 360 m

(see Tab. 2 Segment cable length (^ 61))

Comparison The max. segment cable length is smaller than the total

cable length to be implemented.

Conclusion A repeater must be installed at the determined max.

segment cable length of 360 m.

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 117 118

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Lenze EMF2178IB Uživatelský manuál Strana 62