Total Motor Cable Length - Beckhoff AX8000 Series Manual

7.4

Total motor cable length

Total motor cable length in compliance with EMC Category C3 (industrial area)
Motor cable length per mo-
tor
without mains max. 25 m
choke
with mains choke max. 50 m
AX2090-ND80-xxxx
*always in relation to the connection to a common AX86x0 supply module
Practical example:
Existing drive system comprising:
• Motors from the AM8031-0D21 series (4 units)
◦ Cable lengths (in m): 4, 10, 15 and 22 m
• Motors from the AM8051-0G21 series (4 units)
◦ Cable lengths (in m): 16, 18, 21, 25 m
• AX8206 axis modules (4 units) and AX8620 power supply module
Total standstill current (I
4 x 1.95 A (AM8031) + 4 x 4.75 A (AM8051) = 26.8 A
Total standstill current (I
26.8 A x 0.7 = 18.76 A (the AX8620 power supply module was selected on the basis of this calculation).
24 V DC current consumption of all components:
0.12 A (AX8620) + 4 x 0.57 A (AX8206) + 4 x 0.33 A (brake) + 4 x 0.54 A (brake) = 5.88 A
Result:
The max. single cable length is ≤ 25 m √ Requirement fulfilled
The total cable length is 131 m (≤ 300 m) √ Requirement fulfilled
The max. DC link capacitance is: 945 µF* (≤ 4226 µF) √ Requirement fulfilled
The 24 V current consumption of all components is: 5.88 A
DC
Therefore no mains choke is required.
Maximum loadable DC link capacity:
The different DC link capacities of the modules of the multi axis servo system AX8000
please refer to the chapter: "Electrical installation [} 37]."
Multi axis servo system AX8000
Total motor cable length per
drive system
max. 300 m
max. 500 m
) of all motors:
0
) x estimated simultaneity factor:
0
NOTE
Version: 1.6
Number of axes per drive system
• limited by the max. chargeable DC link
capacitance (see chapter: "Electrical
installation [} 37]") and
• limited by the 24 V
A ).
DC
The requirement is determined through the
module and motor braking current.
(≤ 50 A ) √ Requirement fulfilled
DC DC
Electrical installation
supply (max. 50
DC
DC
47