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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
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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 10s
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 4240µF + 2 x 504µF + 2 x 900µF + 1 x 1060µF = 8108µF
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).
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