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MSD Servo Drive DC-AC Operation Manual
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Appendix
Project planning
65
Id.-No.: CA97554-001 Date: 06/2012
The precharge circuit and DC link of the power supply unit must not be overloaded.
Consequently, the total power tap and total DC link capacitance of all DC-AC servo
drives must not exceed the limit values of the power supply unit. In this regard refer to
tables A.4 and A.5:
Power supply unit
Power output [kW]
DC link
capacitance
[µF]
max. DC link
capacitance [µF]
Continu-
ous
Peak
1)
G396-026
26
52
900
10000
G396-050
50
94
G396-075
75
127
4240
20000
G396-110
110
160
1) for 10 s
Table A.4 Power output and capacitances of the power supply units
DC-AC servo drive
DC link capacitance [µF]
Air cooling
Liquid cooling
G393-004
60
-
G393-006
60
-
G393-008
105
-
G393-012
105
-
G393-016 / G397-020
288
288
G393-020 / G397-025
288
288
G393-024 / G397-026
504
504
G393-032 / G397-035
504
504
G393-045 / G397-053
430
900
G393-060 / G397-070
900
900
G393-072 / G397-084
900
900
G393-090 / G397-110
1060
2120
G393-110 / G397-143
2120
2120
G393-143 / G397-170
3180
4240
G393-170 / G397-210
4240
4240
Table A.5 DC link capacitances of the DC-AC servo drives
Calculation example: Feed with power supply unit
Two DC-AC servo drives G393-024, two DC-AC servo drives G393-060 and one
DC-AC servo drive G393-090 (air-cooled) are to be connected to a power supply unit
G396-075.
Calculation:
1 x 4240 µF + 2 x 504 µF + 2 x 900 µF + 1 x 1060 µF = 8108 µF
Result:
The power supply unit is adequately dimensioned with a maximum
precharge capacitance of 9200 µF.
NOTE:
Note that not only the DC link capacitances of the DC-AC servo drives,
but also of the power supply unit, need to be considered.
A.7.5 External components
When using a power supply unit you will need additional components:
•
Mains connection set (comprising mains filter, input reactor including capacitor,
step-up reactor, EMC fixings)
See MSD Servo Drive Ordering Catalog (Id. No.: CDL 29950-en).
