STOBER
7 | Project configuration
02/2019 | ID 442728.05
83
7.4.3
Sample calculation
Assume 20 motors, each with a nominal current of 2 A and an operating time of 100% (full
load). The design calls for 10 SI6A062 double-axis controllers with a nominal output current of 2
× 5 A.
1. Checking the self-capacitance of the drive controllers versus the charging capacity of
the supply module
The DC link capacitance in the group to be charged corresponds to the sum of the self-
capacitances of all drive controllers in the group: 10 × 0.27 mF = 2.7 mF.
The maximum charging capacity of the PS6A24 supply module is 5 mF.
This means one PS6A24 supply module is sufficient.
2. Determining current requirements and checking utilization
The nominal input current (DC) of a SI6A062 is 8.4 A; the nominal output current is 5 A per axis.
The motor's nominal current is 2 A.
The current requirement for the specific application is 8.4 A ÷ 5 A × 2 A = 3.36 A per drive
controller. As a result, 10 drive controllers would need 33.6 A.
The nominal input current of a PS6A24 supply module is 21 A; the nominal input current of a
PS6A34 is 42 A.
The PS6A24 supply module is not sufficient in terms of the current requirements. A PS6A34
supply module is needed.
3. Checking the length of the copper rails
The width of a SI6A062 drive controller is 45 mm; the width of the PS6A34 supply module is
65 mm.
The total length of the group corresponds to: 10 × 45 mm + 65 mm − 2 × 2.5 mm = 510 mm.
At 1500 mm, the length of a standard copper rail is sufficient.
7.5
Order overview of the hardware components
Device
Terminal set
Quick DC-Link
Type
ID No.
ID No.
Type
ID No.
Width [mm]
PS6A24
56650
138660
DL6B20
56656
45
PS6A34
56651
138661
DL6B21
56658
65
SI6A061
56645
138655
DL6B10
56655
45
SI6A062
56646
138656
DL6B10
56655
45
SI6A161
56647
138657
DL6B11
56656
65
SI6A162
56648
138658
DL6B11
56656
65
SI6A261
56649
138659
DL6B11
56656
65
SI6A262
56653
138662
DL6B12
56663
105
SI6A361
56654
138663
DL6B12
56663
105
Tab. 78: Overview of hardware components with ID No.
