Practical example
The configured 480 VDC drive system consists of:
Number | Component |
|---|---|
4 | Servomotors from the AM8031-0D21 series with a cable length of 4 m, 10 m, 15 m and 22 m |
4 | Servomotors from the AM8051-0G21 series with a cable length of 16 m, 18 m, 21 m and 25 m |
4 | Dual-axis modules from the AX8206 series |
1 | Power supply modules from the AX8620 series |
Total standstill current I0
The total standstill current I0 relates to all servomotors listed in the practical example and corresponds to:
- 4 x 1.95 A for the AM8031 + 4 x 4.75 A for the AM8051 = 26.8 A
The total standstill current I0 is now multiplied by the simultaneity factor. In the case of a machine tool this is relatively high, e.g. 0.9, because all axes can drive into the material at the same time. In the case of a handling system the factor is more likely to be 0.7. This then corresponds to:
- 26.8 A x 0.7 = 18.76 A
The AX8620 power supply module was selected on the basis of the calculations.
24 VDC current consumption
The 24 VDC current consumption relates to all the components listed in the practical example and corresponds to:
- 0.12 A for the AX8620 + 4 x 0.57 A for the AX8206 + 4 x 0.33 A for the holding brake with the AM8031 + 4 x 0.54 A for the holding brake with the AM8051 = 5.88 ADC
Result
The maximum single cable length for the AM8051-0G21 is 25 m and is thus ≤ 25 m
The total cable length of all servomotors is 131 m and is thus ≤ 300 m
- No AX2090-ND80-xxxx mains choke required
The 24 VDC current consumption of all components is 5.88 ADC and is therefore ≤ 20 ADC
- 24 VDC power supply unit with at least 6 A nominal current provided
The maximum DC link capacitance is always related to the connection to a common AX8620 power supply module with 945 µF and is thus ≤ 6000 µF